CRYPTO-GRAM, July 15, 2005
Bruce Schneier <[email protected]> Fri, 15 Jul 2005 08:31:29 -0500
| Newsgroups | gmane.comp.security.crypto-gram |
|---|---|
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CRYPTO-GRAM
July 15, 2005
by Bruce Schneier
Founder and CTO
Counterpane Internet Security, Inc.
[email protected]
<http://www.schneier.com>
<http://www.counterpane.com>
A free monthly newsletter providing summaries, analyses, insights, and
commentaries on security: computer and otherwise.
For back issues, or to subscribe, visit
<http://www.schneier.com/crypto-gram.html>.
You can read this issue on the web at
<http://www.schneier.com/crypto-gram-0507.html>. These same essays appear
in the "Schneier on Security" blog: <http://www.schneier.com/blog>. An RSS
feed is available.
** *** ***** ******* *********** *************
In this issue:
London Transport Bombings
Terrorism Defense: A Failure of Imagination
CardSystems Exposes 40 Million Identities
Noticing Data Misuse
Indian Call Center Sells Personal Information
Crypto-Gram Reprints
Write Down Your Password
The Adaptability of Iraqi Insurgents
News
Organized Retail Theft
The Doghouse: Privacy.li
SHA-1 Cryptanalysis
Security Skins
Counterpane News
Evaluating the Effectiveness of Security Countermeasures
Speeding Ticket Avoidance
Redefining Spyware
Talking to Strangers
Comments from Readers
** *** ***** ******* *********** *************
London Transport Bombings
I was on vacation last weekend, and still haven't had a lot of time to read
or write about the London Transport bombings. For now, I would just like to
express my sympathy and condolences to those directly affected, and to the
good people of London, England, Europe, and the world. Targeting innocents
might be an effective tactic, but that doesn't make it any less craven and
despicable.
I would also like to urge everyone not to get wrapped up in the particulars
of the terrorist tactics. We need to resist the urge to react against the
particulars of this particular terrorist plot, and to keep focused on the
terrorists' goals. Spending billions to defend our trains and buses at the
expense of other counterterrorist measures makes no sense. Terrorists are
out to cause terror, and they don't care if they bomb trains, buses,
shopping malls, theaters, stadiums, schools, markets, restaurants, discos,
or any other collection of 100-plus people in a small space. There are
simply too many targets to defend, and we need to think more intelligently
than simply protecting the particular targets the terrorists attacked last
week.
Smart counterterrorism focuses on the terrorists and their funding --
stopping plots regardless of their targets -- and emergency response that
limits their damage.
I'll have more to say next month. But again, my sympathy goes out to those
killed and injured, their family and friends, and everyone else in the
world indirectly affected by these acts as they are endlessly replayed in
the media.
** *** ***** ******* *********** *************
Terrorism Defense: A Failure of Imagination
The 9/11 Commission report talked about a "failure of imagination" before
the 9/11 attacks: "The most important failure was one of imagination. We
do not believe leaders understood the gravity of the threat. The terrorist
danger from Bin Ladin and al Qaeda was not a major topic for policy debate
among the public, the media, or in the Congress. Indeed, it barely came up
during the 2000 presidential campaign."
More generally, this term has been used to describe the U.S. government's
response to the terrorist threat. We spend a lot of money defending against
what they did last time, or against particular threats we imagine, but
ignore the general threat or the root causes of terrorism.
With the London bombings, we're doing it again. I was going to write a long
post about this, but Richard Forno already wrote a nice essay.
Forno's essay:
<http://www.infowarrior.org/articles/2005-01.html>
9/11 Commission Report:
<http://www.washingtonpost.com/wp-srv/nation/911report/documents/911ReportExec.pdf>
or <http://tinyurl.com/3vojj>
<http://en.wikipedia.org/wiki/Failure_of_imagination>
** *** ***** ******* *********** *************
CardSystems Exposes 40 Million Identities
The personal information of over 40 million people has been hacked. The
hack occurred at CardSystems Solutions, a company that processes credit
card transactions. The details are still unclear. The New York Times
reports that "data from roughly 200,000 accounts from MasterCard, Visa and
other card issuers are known to have been stolen in the breach," although
40 million were vulnerable. The theft was an intentional malicious computer
hacking activity: the first in all these recent personal-information
breaches, I think. The rest were accidental -- backup tapes gone walkabout,
for example -- or social engineering hacks. Someone was after this data,
which implies that's more likely to result in fraud than those peripatetic
backup tapes.
CardSystems says that they found the problem, while MasterCard maintains
that they did; the New York Times agrees with MasterCard. Microsoft
software may be to blame. And in a weird twist, CardSystems admitted they
weren't supposed to keep the data in the first place.
>From the New York Times: "The official, John M. Perry, chief executive
of CardSystems Solutions...said the data was in a file being stored for
'research purposes' to determine why certain transactions had registered as
unauthorized or uncompleted."
Yeah, right. Research = marketing, I'll bet.
This is exactly the sort of thing that Visa and MasterCard are trying very
hard to prevent. They have imposed their own security requirements on
companies -- merchants, processors, whoever -- that deal with credit card
data. Visa has instituted a Cardholder Information Security Program (CISP).
MasterCard calls its program Site Data Protection (SDP). These have been
combined into a single joint security standard, PCI, which also involves
Discover, American Express, JCB, and Diners Club to some degree.
PCI requirements encompass network security, password management,
stored-data encryption, access control, monitoring, testing, policies, etc.
And the credit-card companies are backing these requirements up with stiff
penalties: cash fines of up to $100,000, increased transaction fees, and
termination of the account. For a retailer that does most of its business
via credit cards, this is an enormous incentive to comply.
These aren't laws, they're contractual business requirements. They're not
imposed by government; the credit card companies are mandating them to
protect their brands.
Every credit card company is terrified that people will reduce their credit
card usage. They're worried that all of this press about stolen personal
data, as well as actual identity theft and other types of credit card
fraud, will scare shoppers off the Internet. They're worried about how
their brands are perceived by the public. And they don't want some idiot
company ruining their reputations by exposing 40 million cardholders to the
risk of fraud. (Or, at least, by giving reporters the opportunity to write
headlines like "CardSystems Solutions hands over 40M credit cards to hackers.")
So independent of any laws or government regulations, the credit card
companies are forcing companies that process credit card data to increase
their security. Companies have to comply with PCI or face serious consequences.
Was CardSystems in compliance? They should have been in compliance with
Visa's CISP by 30 September 2004, and certainly they were in the highest
service level. (PCI compliance wasn't required until 30 June 2005 -- about
two weeks after the breach was announced.) The reality is more murky.
Also from the New York Times:
"After the disclosure of the security breach at CardSystems, varying
accounts were offered about the company's compliance with card association
standards.
"Jessica Antle, a MasterCard spokeswoman, said that CardSystems had never
demonstrated compliance with MasterCard's standards. 'They were in
violation of our rules,' she said.
"It is not clear whether or when MasterCard intervened with the company in
the past to insure compliance, but MasterCard said Friday that it had now
given CardSystems 'a limited amount of time' to do so.
"Asked about compliance with Visa's standards, a Visa spokeswoman, Rosetta
Jones, said, 'This particular processor was not following Visa's security
requirements when we found out there was a potential data compromise.'
"Earlier, Mr. Perry of CardSystems said his company had been audited in
December 2003 by an unspecified independent assessor and had received a
seal of approval from the Visa payment associations in June 2004."
All of this demonstrates some limitations of any certification system. One,
companies can take advantage of interpersonal and intercompany politics to
get themselves special treatment with respect to the policies. And two, all
audits rely to a great extent on self-assessment and self-disclosure. If a
company is willing to lie to an auditor, it's unlikely that it will get caught.
Unless they get really caught, like this incident.
Self-reporting only works if the punishment exceeds the crime. The reason
people accurately declare what they bring into the country on their customs
forms, for example, is because the penalties for lying are far more
expensive than paying any duty owed.
If the credit card industry wants their PCI requirements taken seriously,
they need to make an example out of CardSystems. They need to revoke
whatever credit card processing license CardSystems has, to the maximum
extent possible by whatever contracts they have in place. Only by making
CardSystems a demonstration of what happens to someone who doesn't comply
will everyone else realize that they had better comply.
(CardSystems should also face criminal prosecution, but that's unlikely in
today's business-friendly political environment.)
I have great hopes for PCI. I like security solutions that involve
contracts between companies more than I like government intervention. Often
the latter is required, but the former is more effective. Here's PCI's
chance to demonstrate their effectiveness.
News articles:
<http://news.bbc.co.uk/2/hi/americas/4107236.stm>
<http://www.computerworld.com/securitytopics/security/story/0,10801,102631,00.html>
or <http://tinyurl.com/bmjwg>
<http://www.merit.edu/mail.archives/netsec/msg00625.html>
<http://businessweek-cnet.com.com/CardSystems+Well+meet+security+goals+soon/2100-1029_3-5780265.html>
or <http://tinyurl.com/a5wcy>
<http://techrepublic.com.com/5254-6257-0.html?forumID=99&threadID=174095&messageID=1794064&id=4137111>
or <http://tinyurl.com/ck79c>
<http://news.softpedia.com/news/Microsoft-Software-to-Blame-for-the-CardSystems-Data-Security-Breach-3440.shtml>
or <http://tinyurl.com/76gla>
<http://news.softpedia.com/news/CardSystems-Solutions-hands-over-40M-credit-cards-to-hackers-3367.shtml>
or <http://tinyurl.com/8dxo7>
Press releases from CardSystems and MasterCard:
<http://www.cardsystems.com/news.html>
<http://www.mastercardinternational.com/cgi-bin/newsroom.cgi?id=1038 >
CISP, SDP, and PCI:
<http://usa.visa.com/business/accepting_visa/ops_risk_management/cisp.html?it=l2|/business/accepting_visa/ops_risk_management/cisp_merchants.html|CardholderInformationSecurityProgram>
or <http://tinyurl.com/96544>
<https://sdp.mastercardintl.com/>
<http://usa.visa.com/download/business/accepting_visa/ops_risk_management/cisp_PCI_Data_Security_Standard.pdf>
or <http://tinyurl.com/4ph6h>
<http://usa.visa.com/business/accepting_visa/ops_risk_management/cisp_service_providers.html>
or <http://tinyurl.com/bzzsh>
** *** ***** ******* *********** *************
Noticing Data Misuse
Everyone seems to be looking at their databases for personal information
leakages. Here's one article:
"Tax liens, mortgage papers, deeds, and other real estate-related documents
are publicly available in on-line databases run by registries of deeds
across the state. The Globe found documents in free databases of all but
three Massachusetts counties containing the names and Social Security
numbers of Massachusetts residents....
"Although registers of deeds said that they are unaware of cases in which
criminals used information from their databases maliciously, the
information contained in the documents would be more than enough to steal
an identity and open new lines of credit...."
Isn't that part of the problem, though? It's easy to say "we haven't seen
any cases of fraud using our information," because there's rarely a way to
tell where information comes from. The recent epidemic of public leaks
comes from people noticing the leak process, not the effects of the leaks.
So everyone thinks their data practices are good, because there have never
been any documented abuses stemming from leaks of their data, and everyone
is fooling themselves.
<http://www.boston.com/business/technology/articles/2005/06/23/states_online_records_pose_risk/>
or <http://tinyurl.com/axgr7>
** *** ***** ******* *********** *************
Indian Call Center Sells Personal Information
There was yet another incident where a call center staffer was selling
personal data. The data consisted of banking details of British customers,
and was sold by people at an outsourced call center in India.
I predict a spate of essays warning us of the security risks of offshore
outsourcing. That's stupid; this has almost nothing to do with offshoring.
It's no different than the Lembo case, and that happened in the safe and
secure United States.
There are security risks to outsourcing, and there are security risks to
offshore outsourcing. But the risk illustrated in this story is the risk of
malicious insiders, and that is mostly independent of outsourcing. Lousy
wages, lack of ownership, a poor work environment, and so on can all
increase the risk of malicious insiders, but that's true regardless of who
owns the call center or in what currency the salary is paid in. Yes, it's
harder to prosecute across national boundaries, but the deterrence here is
more contractual than criminal.
(On the one hand, since the standard of living is lower in India, it's
presumably cheaper to bribe employees. But on the other hand, offshore
employees, since they're well-paid by comparison to general salaries, have
more incentive to keep their jobs.)
The problem here is people, not corporate or national boundaries.
<http://uk.biz.yahoo.com/050622/323/flt1q.html>
<http://yro.slashdot.org/article.pl?sid=05/06/23/1245204&tid=158&tid=98> or
<http://tinyurl.com/78ar8>
Lembo Case:
<http://www.schneier.com/blog/archives/2005/05/massive_data_th_1.html>
<http://www.computerworld.com/securitytopics/security/cybercrime/story/0,10801,101903,00.html>
or <http://tinyurl.com/avsqp>
** *** ***** ******* *********** *************
Crypto-Gram Reprints
Crypto-Gram is currently in its ninth year of publication. Back issues
cover a variety of security-related topics, and can all be found on
<http://www.schneier.com/crypto-gram.html>. These are a selection of
articles that appeared in this calendar month in other years.
Due Process and Security:
<http://www.schneier.com/crypto-gram-0407.html#1>
Coca-Cola and the NSA:
<http://www.schneier.com/crypto-gram-0407.html#8>
How to Fight:
<http://www.schneier.com/crypto-gram-0307.html#1>
Crying Wolf:
<http://www.schneier.com/crypto-gram-0307.html#8>
Embedded Control Systems and Security:
<http://www.schneier.com/crypto-gram-0207.html#1>
Phone Hacking: The Next Generation:
<http://www.schneier.com/crypto-gram-0107.html#1>
Monitoring First:
<http://www.schneier.com/crypto-gram-0107.html#5>
Full Disclosure and the CIA:
<http://www.schneier.com/crypto-gram-0007.html#1>
Security Risks of Unicode:
<http://www.schneier.com/crypto-gram-0007.html#9>
The Future of Crypto-Hacking:
<http://www.schneier.com/crypto-gram-9907.html#hacking>
Bungled SSL:
<http://www.schneier.com/crypto-gram-9907.html#doghouse>
Declassifying Skipjack:
<http://www.schneier.com/crypto-gram-9807.html#skip>
** *** ***** ******* *********** *************
Write Down Your Password
Last month, Microsoft's Jesper Johansson made the news when he urged people
to write down their passwords. This is good advice, and I've been saying
it for years.
Simply, people can no longer remember passwords good enough to reliably
defend against dictionary attacks, and are much more secure if they choose
a password too complicated to remember and then write it down. We're all
good at securing small pieces of paper. I recommend that people write
their valuable passwords down on a small piece of paper, and keep it with
their other valuable small pieces of paper: in their wallet. Obscure it
somehow if you want added security: write "bank" instead of the URL of your
bank, transpose some of the characters, leave off your userid. This will
give you a little bit of time if you lose your wallet and have to change
your passwords. But even if you don't do any of this, writing down your
impossible-to-memorize password is more secure than making your password
easy to memorize.
<http://news.com.com/Microsoft+security+guru+Jot+down+your+passwords/2100-7355_3-5716590.html>
or <http://tinyurl.com/8tuz3>
Or you can use PasswordSafe:
<http://www.schneier.com/passsafe.html>
** *** ***** ******* *********** *************
The Adaptability of Iraqi Insurgents
This Newsweek article on the insurgents in Iraq includes an interesting
paragraph on how they adapt to American military defenses.
"Counterinsurgency experts are alarmed by how fast the other side's tactics
can evolve. A particularly worrisome case is the ongoing arms race over
improvised explosive devices. The first IEDs were triggered by wires and
batteries; insurgents waited on the roadside and detonated the primitive
devices when Americans drove past. After a while, U.S. troops got good at
spotting and killing the triggermen when bombs went off. That led the
insurgents to replace their wires with radio signals. The Pentagon, at
frantic speed and high cost, equipped its forces with jammers to block
those signals, accomplishing the task this spring. The insurgents adapted
swiftly by sending a continuous radio signal to the IED; when the signal
stops or is jammed, the bomb explodes. The solution? Track the signal and
make sure it continues. Problem: the signal is encrypted. Now the Americans
are grappling with the task of cracking the encryption on the fly and
mimicking it-so far, without success. Still, IED casualties have dropped,
since U.S. troops can break the signal and trigger the device before a
convoy passes. That's the good news. The bad news is what the new
triggering system says about the insurgents' technical abilities."
The CIA is worried that Iraq is becoming a far more effective breeding
ground for terrorists than Afghanistan ever was, because they get
real-world experience with urban terrorist-style combat.
<http://www.msnbc.msn.com/id/8272786/site/newsweek/>
** *** ***** ******* *********** *************
News
Airplane security is getting surreal: "...FAA regulation that requires
soldiers -- all of whom were armed with an arsenal of assault rifles,
shotguns and pistols -- to surrender pocket knives, nose hair scissors and
cigarette lighters."
<http://www.ajc.com/news/content/custom/blogs/guard/entries/2005/05/19/drop_those_nose_hair_clippers_soldier.html>
or <http://tinyurl.com/7z8my>
"A foolish consistency is the hobgoblin of little minds." -- Ralph Waldo
Emerson
This is from 2003, but I had not seen it before: "Analysis of the MediaMax
CD3 Copy-Prevention System."
<http://www.cs.princeton.edu/~jhalderm/cd3/>
The story about Dell Computers selling machines with hardware keyboard
loggers built in is a hoax.
<http://c0x2.de/lol/lol.html>
<http://www.snopes.com/computer/internet/dellbug.asp>
The Underhanded C Contest is, as far as I know, the only security-related
programming contest. The object is to write clear, readable C code with
hidden malicious behavior; in other words, to hide evil stuff in code that
passes visual inspection of source by other programmers.
<http://www.brainhz.com/underhanded/>
Here's an interesting application of DNA identification. It's a spray that
triggers if a door is opened, spraying the burglar with a powder. Then,
instead of searching for your DNA at the crime scene, the police search for
the crime-scene DNA on you.
<http://news.bbc.co.uk/1/hi/wales/north_east/4566991.stm>
Dell Computer demands to know what you're going to use your new computer
for, because of the PATRIOT Act.
<http://www.skippy.net/blog/2005/06/09/security-through-stupidity/>
Seagate has introduced a hard drive with full-disk encryption.
<http://www.computerworld.com/securitytopics/security/story/0,10801,102649,00.html>
or <http://tinyurl.com/bw872>
<http://www.eweek.com/article2/0,1759,1825740,00.asp>
Here's the press release, and here's the product spec sheet. Ignore the
"TDEA 192" nonsense. It's a typo; the product uses triple-DES, and the
follow-on product will use AES.
<http://www.seagate.com/cda/newsinfo/newsroom/releases/article/0,,2732,00.html>
or <http://tinyurl.com/9wjo8>
<http://www.seagate.com/content/docs/pdf/marketing/PO-Momentus-FDE.pdf>
Good interview with Marcus Ranum:
<http://www.securityfocus.com/columnists/334>
The U.S. Justice Department wants your ISP to spy on you:
<http://news.com.com/Your+ISP+as+Net+watchdog/2100-1028_3-5748649.html> or
<http://tinyurl.com/7s49k>
Great editorial from Wired on identity theft. It includes specific
recommendations to Congress.
<http://wired.com/news/privacy/0,1848,67845,00.html>
I'm not going to doghouse this, because it seems like good technology that
has been mauled by dumb PR agents: "The newly developed network, said the
researchers, is compatible with existing Internet protocols, which means
that current Internet applications will be able to use standard
transmission techniques and even high-level encryption up to and beyond 256
bits, which is currently double the amount considered essential for secure
Internet transactions."
<http://www.wirelessnewsfactor.com/story.xhtml?story_id=11300002GZES>
A security analysis of Diebold's Opti-Scan (paper ballot) voting machine.
<http://www.bbvforums.org/cgi-bin/forums/board-auth.cgi?file=/1954/5921.html>
or <http://tinyurl.com/buprr>
An amusing Flash animation featuring a musical opinion of Clarke's proposed
UK national ID card.
<http://eclectech.co.uk/clarkeidcards.php>
Interesting story on the black market for data in Moscow:
<http://attrition.org/errata/dataloss/russia02.html>
Here's a body-scan technology -- Millimeter-Wave Detection -- that's less
invasive than backscatter X-ray technology.
<http://www.brijot.com/>
The Hymn Project exists to break the iTunes mp4 copy-protection scheme, so
you can hear the music you bought on any machine you want. Initially, the
software recovered your iTunes password (your key, basically) from your
hard drive. In response, Apple obfuscated the format and no one has yet
figured out how to recover the keys cleanly. To get around this, they
developed a program called FairKeys that impersonates iTunes and contacts
the server. Since the iTunes client can still get your password, this
works. More security by inconvenience, and yet another illustration of the
never-ending arms race between attacker and defender.
<http://www.hymn-project.org/>
<http://www.hymn-project.org/jhymndoc/jhymn_faq.php#fairkeys>
I got some really good quotes in this New York Times article on identity theft.
<http://www.nytimes.com/2005/07/09/business/09nocera.html>
Interesting article on the particular art form of street photography. One
ominous paragraph: "More onerous are post-9/11 restrictions that have
placed limits on photographing in public settings. Tucker has received
e-mails from professionals detained by authorities for photographing
bridges and elevated trains. 'There are places where photographing people
on the street may become illegal,'" observes Westerbeck." Sad.
<http://csmonitor.com/2005/0708/p12s01-alar.html>
Police have arrested a man for using someone else's wireless Internet
network without permission. Near as I can tell, there was no other
criminal activity involved. The man who used someone else's wireless wasn't
doing anything wrong with it; he was just using the Internet. I believe
this is the first criminal case involving this fairly common practice.
<http://www.cnn.com/2005/LAW/07/07/wi.fi.theft.ap/index.html>
A recently published book claims that Himmler was murdered by the British
Special Operations Executive, rather than committing suicide after the
Allies captured him. The book was based on documents found -- apparently in
good faith -- in the UK's National Archive, which now appear to have been
faked and inserted. It seems that the security effort at the National
Archives is directed towards preventing people from removing documents. But
the effects of adding forged documents could be much worse.
<http://news.telegraph.co.uk/news/main.jhtml?xml=/news/2005/07/02/nhimmler02.xml>
or <http://tinyurl.com/cyko3>
<http://opinion.telegraph.co.uk/opinion/main.jhtml?xml=/opinion/2005/07/02/dl0203.xml>
or <http://tinyurl.com/8vglg>
I've already written about the stupidity of worrying about cell phones on
airplanes. Now the Department of Homeland Security is worried about
broadband Internet, and wants the ability to begin eavesdropping on any
passenger's internet use within 10 minutes of obtaining court
authorization. Terrorists never use SSH, after all. (I suppose that's the
next thing the DHS is going to try to ban.)
<http://wirednews.com/news/technology/0,1282,68147,00.html>
NIST (The United States' National Institute of Standards and Technology)
has released a draft of "Special Publication 800-56, Recommendation for
Pair-Wise Key Establishment Schemes Using Discrete Logarithm
Cryptography." They're looking for comments before the document is
finalized. Send comments to [email protected] by Friday, August 19th, with
"Comments on SP800-56" in the subject line.
<http://csrc.nist.gov/CryptoToolkit/kms/SP800-56_7-5-05.pdf>
Secure RSS syndication:
<http://www.xml.com/pub/a/2005/07/13/secure-rss.html>
I was going to write something about the foolishness of adding cameras to
public spaces as a response to terrorism threats, but Scott Henson said it
already.
<http://gritsforbreakfast.blogspot.com/2005/07/cameras-wrong-response-to-london.html>
or <http://tinyurl.com/74ang>
According to the London Times: "Security sources confirmed that none of the
bombers was on any MI5 file, although one had links to a person
investigated by police."
<http://www.timesonline.co.uk/article/0,,22989-1692540_1,00.html>
** *** ***** ******* *********** *************
Organized Retail Theft
There are two distinct shoplifting threats: petty shoplifting and Organized
Retail Theft. "ORT crime is separate and distinct from petty shoplifting
in that it involves professional theft rings that move quickly from
community to community and across state lines to steal large amounts of
merchandise that is then repackaged and sold back into the marketplace.
Petty shoplifting, as defined, is limited to items stolen for personal use
or consumption."
Their list of 50 most shoplifted items consists of small, expensive things
with long shelf life: over-the-counter drugs, mostly.
#1 Advil tablet 50 ct
#2 Advil tablet 100 ct
#3 Aleve caplet 100 ct
#4 EPT Pregnancy Test single
#5 Gillette Sensor 10 ct
#6 Kodak 200 24 exp
#7 Similac w/iron powder - case
#8 Similac w/iron powder - single can
#9 Preparation H 12 ct
#10 Primatene tablet 24 ct
<http://www.fmi.org/loss/ORT/>
<http://www.fmi.org/loss/ORT/top50_shoplifted_items.pdf>
** *** ***** ******* *********** *************
The Doghouse: Privacy.li
This company has a heartwarming description on its website: "Privacy from
the Principality of Liechtenstein, in the heart of the Alps, nestled
between Switzerland and Austria. In times of turmoil and insecurity, witch
hunt and suspicions, expropriations and diminishing credibility of our
world leaders it's always good to have a place you can turn to. This is the
humble effort to provide a place to the privacy and freedom concerned world
citizens to meet, discuss, help each other and foster ones desire for
liberty and freedom."
But they have no intention of letting their customers know anything about
themselves: "Company Profile -- Actually, this is not to be published
here:-) A privacy service like ours is best if not too many details are
known, we hope you fully understand and support this. The makers of this
page are veterans at the chosen subject, and will under no circumstances
jeopardize your privacy."
Oh yeah, and the "DriveCrypt" product they sell includes "real Time, 1344
bit - Military Strength encryption."
Somehow, my heart is no longer warm.
<http://www.privacy.li/>
<http://www.privacy.li/drivecrypt.htm>
** *** ***** ******* *********** *************
SHA-1 Cryptanalysis
In February, I wrote about a group of Chinese researchers who broke the
SHA-1 hash function. That posting was based on short notice from the
researchers. Since then, many people have written me asking about the
research and the actual paper, some questioning the validity of the
research because of the lack of documentation.
The paper did exist; I saw a copy. They will present it at the Crypto
conference in August. I believe they didn't post it because Crypto requires
that submitted papers not be previously published, and they misunderstood
that to mean that it couldn't be widely distributed in any way.
Now there's a copy of the paper on the Web. You can read "Finding
Collisions in the Full SHA-1," by Xiaoyun Wang, Yiqun Lisa Yin, and Hongbo Yu.
The paper:
<http://cryptome.org/wang_sha1_v2.zip>
<http://www.schneier.com/blog/archives/2005/02/cryptanalysis_o.html>
<http://theory.csail.mit.edu/~yiqun/shanote.pdf>
** *** ***** ******* *********** *************
Security Skins
Much has been written about the insecurity of passwords. Aside from being
guessable, people are regularly tricked into providing their passwords to
rogue servers because they can't distinguish spoofed windows and webpages
from legitimate ones.
There's a clever scheme by Rachna Dhamija and Doug Tygar at the University
of California Berkeley that tries to deal with the problem. It's called
"Dynamic Security Skins," and it's a pair of protocols that augment passwords.
First, the authors propose creating a trusted window in the browser
dedicated to username and password entry. The user chooses a photographic
image (or is assigned a random image), which is overlaid across the window
and text entry boxes. If the window displays the user's personal image, it
is safe for the user to enter his password.
Second, to prove its identity, the server generates a unique abstract image
for each user and each transaction. This image is used to create a "skin"
that automatically customizes the browser window or the user interface
elements in the content of a webpage. The user's browser can independently
reach the same image that it expects to receive from the server. To verify
the server, the user only has to visually verify that the images match.
Not a perfect solution by any means -- much Internet fraud bypasses
authentication altogether and this system is susceptible to
man-in-the-middle attacks -- but two clever ideas that use visual cues to
ensure security. You can also verify server authenticity by inspecting the
SSL certificate, but no one does that. With this scheme, the user has to
recognize only one image and remember one password, no matter how many
servers he interacts with. In contrast, the recently announced Site Key
(Bank of America's implementation of the Passmark scheme) requires users to
save a different image with each server.
The paper:
<http://www.tygar.net/papers/Battle_against_phishing.pdf>
SiteKey and Passmark:
<http://www.bankofamerica.com/privacy/passmark/>
<http://www.passmarksecurity.com/main.jsp>
Limits of authentication:
<http://www.schneier.com/blog/archives/2005/03/the_failure_of.html>
** *** ***** ******* *********** *************
Counterpane News
Counterpane's second-quarter results:
<http://www.counterpane.com/pr-20050715.html>
Counterpane is seeking talents to fill openings in operations and sales:
<http://www.counterpane.com/jobs.html>
Review of Beyond Fear:
<http://www.securitypipeline.com/164902244;jsessionid=NPFSUEUTX5MVEQSNDBGCKH0CJUMEKJVN>
or <http://tinyurl.com/958y5>
Review of Secrets and Lies:
<http://www-128.ibm.com/developerworks/rational/library/mar05/reader/higgins.html>
or <http://tinyurl.com/agxbn>
In December, I gave a long interview to a literary magazine called Turnrow.
That interview was finally published, and it's even better than I remembered.
<http://turnrow.ulm.edu/bruceschneierinterview.htm>
** *** ***** ******* *********** *************
Evaluating the Effectiveness of Security Countermeasures
Amidst all the emotional rhetoric about security, it's nice to see
something well-reasoned. A New York Times op-ed by Nicholas
Kristof earlier this month looks at security as a trade-off, and makes a
distinction between security countermeasures that reduce the threat and
those that simply shift it.
I wrote about this in Beyond Fear: "A burglar who sees evidence of an
alarm system is more likely to go rob the house next door. As far as the
local police station is concerned, this doesn't mitigate the risk at all.
But for the homeowner, it mitigates the risk just fine."
The difference is the perspective of the defender.
Problems with perspectives show up in counterterrorism defenses all the
time. Also from Beyond Fear: "It's important not to lose sight of the
forest for the trees. Countermeasures often focus on preventing particular
terrorist acts against specific targets, but the scope of the assets that
need to be protected encompasses all potential targets, and they all must
be considered together. A terrorist's real target is morale, and he really
doesn't care about one physical target versus another. We want to prevent
terrorist acts everywhere, so countermeasures that simply move the threat
around are of limited value. If, for example, we spend a lot of money
defending our shopping malls, and bombings subsequently occur in crowded
sports stadiums or movie theaters, we haven't really received any value
from our countermeasures."
<http://www.newsobserver.com/print/thursday/opinion/story/2548446p-8952410c.html>
or <http://tinyurl.com/b8hss>
I like seeing thinking like this in the media, and wish there were more of it.
** *** ***** ******* *********** *************
Speeding Ticket Avoidance
No matter what you think about the morality of speeding, this is a very
popular security-related field...and one that every driver is at least
somewhat interested in.
The Radarbusters site is run by an ex-policeman, and feels authoritative.
He places a lot of emphasis on education; installing a fancy radar detector
isn't doing to do much for you unless you know how to use it
correctly. (He also sells the radar detector he recommends.)
<http://www.radarbusters.com/>
Here's a product that seems to counter the threat of aerial license-plate
scanners.
<http://www.radarbusters.com/products/photo-radar/Overhead-Protector.asp>
or <http://tinyurl.com/a5292>
<http://www.schneier.com/blog/archives/2005/04/licenseplate_sc.html>
This spray claims to make your license plate invisible to cameras. I have
no idea if it works.
<http://www.phantomplate.com/>
One final note: the ex-cop is offering a $5,000 reward for the first person
who can point him to a passive laser jammer that works.
<http://www.radarjammer.com/get-5000/index.htm>
** *** ***** ******* *********** *************
Redefining Spyware
The problem with spyware is that it can be in the eye of the
beholder. There are companies that decry the general problem, but have
their own software report back to a central server.
This kind of thing can result in a conflict of interest: "Spyware is
spyware only if I don't have a corporate interest in it." Here's the most
recent example: "Microsoft's Windows AntiSpyware application is no longer
flagging adware products from Claria Corp. as a threat to PC users. Less
than a week after published reports of acquisition talks between Microsoft
Corp. and the Redwood City, Calif.-based distributor of the controversial
Gator ad-serving software, security researchers have discovered that
Microsoft has quietly downgraded its Claria detections. "
If you're a user of AntiSpyware, you can fix this. Claria's spyware is now
flagged as "Ignore" by default, but you can still change the action to
"Quarantine" or "Remove." I recommend "Remove." Actually, I recommend
using another product.
<http://www.eweek.com/article2/0,1895,1834607,00.asp>
** *** ***** ******* *********** *************
Talking to Strangers
In Beyond Fear I wrote: "Many children are taught never to talk to
strangers, an extreme precaution with minimal security benefit."
In talks, I'm even more direct. I think "don't talk to strangers" is just
about the worst possible advice you can give a child. Most people are
friendly and helpful, and if a child is in distress, asking the help of a
stranger is probably the best possible thing he can do.
This advice would have helped Brennan Hawkins, the 11-year-old boy who was
lost in the Utah wilderness for four days last month. He avoided people
searching for him because he had been taught not to talk to strangers.
In a world where good guys are common and bad guys are rare, assuming a
random person is a good guy is a smart security strategy. We need to help
children develop their natural intuition about risk, and not give them
overbroad rules.
Also in Beyond Fear, I wrote:
"As both individuals and a society, we can make choices about our security.
We can choose more security or less security. We can choose greater
impositions on our lives and freedoms, or fewer impositions. We can choose
the types of risks and security solutions we're willing to tolerate and
decide that others are unacceptable.
"As individuals, we can decide to buy a home alarm system to make ourselves
more secure, or we can save the money because we don't consider the added
security to be worth it. We can decide not to travel because we fear
terrorism, or we can decide to see the world because the world is
wonderful. We can fear strangers because they might be attackers, or we can
talk to strangers because they might become friends."
<http://wireservice.wired.com/wired/story.asp?section=Breaking&storyId=1052553&tw=wn_wire_story>
or <http://tinyurl.com/b52ao>
** *** ***** ******* *********** *************
Comments from Readers
From: "Richard M. Conlan" <[email protected]>
Subject: Stupid People Buy Fake Concert Tickets
Your analysis includes the assumption that the system is actually used as
you profess. In practice I have purchased and printed TicketMaster online
tickets for a number of shows and NEVER has the venue actually scanned the
tickets. Knowing that, people may expect that even a scalped ticket would
get them in...all depends on the shows and the venue. Admittedly, the shows
I am referencing are not necessarily big-name shows or at big-name venues,
but the point remains.
Along the same lines, I keep wondering how hard it would be for somebody to
write a virus that checked mailboxes on POP servers for e-mails including
"ticketmaster" in the FROM address with attached PDFs and sending the PDFs
to a central location.
The above is especially useful if a scalper takes the tickets, sells one
copy and just tells the individuals to get there early (i.e., before the
valid ticket holders). Then the VALID ticket holders get denied access...or
come to find innocent scam-victims sitting in their seats.
From: Paul Schumacher <[email protected]>
Subject: Forget X-ray strip-searches
Using soft X-rays to examine people for weapons is just the foot in the
door. What happens when police cars are equipped with it, scanning people
on the street for proscribed items? Will aluminized clothing become vogue,
just for the privacy, or will that become proscribed as well?
Worse is terahertz imaging radar. Like soft X-ray backscatter, it can see
through clothing. Unlike it, it can also see through walls. I can imagine
police vans cruising residential streets, performing searches of homes
without having to enter the home. They could claim no search warrant is
needed because they do not even enter the property, let alone the
home. Combined with image recognition computers, a scan-search of a home
could be done very quickly.
The questions become:
1. will the police be permitted to immediately break in and arrest people
found this way possessing contraband, much like police observing a crime
through an open window?
2. Will soft X-ray and terahertz imaging radar be allowed to be used to
perform scan-searches of people on the street, especially without their
knowledge or permission?
3. Will the courts allow such evidence in court, or as grounds for a legal
search warrant?
4. Will passive countermeasures to soft X-ray backscatter and terahertz
imaging radar be proscribed for public use, much like bullet-proof vests
are in many areas? (Aluminized clothing and drapes on windows, aluminum
sheathing on walls and ceiling, metalized or virtual windows).
With the anti-privacy policies of the current administration, I can see an
era where our fourth amendment rights may become meaningless.
Back in the 1960s and 1970s, there was a public outcry about governmental
computer data bases on individuals, and Congress virtually outlawed
them. Today, they are as common as cockroaches in a slum. This technology
will have the same creep into our daily lives.
From: "Thomas Bryce, M.D." <[email protected]>
Subject: U.S. Medical Privacy Law Gutted
> The healthcare industry has been opposed to HIPAA from the
> beginning, because it puts constraints on their business in
> the name of security and privacy.
Many physicians such as myself are opposed to the protected information
portions of HIPAA (which is fairly comprehensive legislation dealing with a
number of topics), not because it puts constraints on business, but because
it simply is not the federal government's business to regulate the flow of
medical information.
The practice of medicine and the protection of patients has always been
strictly in the domain of the states and the privacy regulations of HIPAA
are no more than an attempt by Washington to continue to creep and expand
its authority and influence to cover every aspect of government of our nation.
Beyond the fact that the federal government has no business regulating the
practice of medicine, HIPAA is simply... stupid. The regulations are
ridiculously stringent and absurd for no justifiable reason. For example,
HIPAA purports (I believe HIPAA to be unconstitutional and hence invalid --
thus the use of the word "purports") to proscribe a physician giving
information regarding a patient to third parties except with the patient's
express consent or in certain circumstances.
This means that a physician receiving a phone call, for example from a
patient's relative asking for information about the patient, cannot provide
that information unless the patient has previously given their express consent.
This is (1) simply stupid. The physician should use their judgment about
the medical situation and its character/seriousness, and whatever knowledge
they have of the patient and their family, and make a determination
regarding whether or not it is appropriate to talk to that family member.
And (2) even if not stupid, simply not the federal government's business.
This kind of stuff is regulated on the state level.
From: Jeff Bee <[email protected]>
Subject: Re: Risks of Pointy Knives
As a woodworker, engineer, and connoisseur of good knives and sharp things
in general, I can identify some of the reasons for the continued existence
of pointy ends on longer blades, in the order of what I believe to be
greatest to least effect.
1. Consumer expectations: Same reason most vacuum cleaners are
intentionally much louder than necessary. People subconsciously equate the
effectiveness of the vacuum with its noise level, and if you give the
buying public a pencil and ask them to draw a knife, they will give it a
pointy end. Whether this is a bow to knives' potential use as a weapon, or
a demonstration of the inertia of public perception is a matter for a
different letter.
2. Mechanics of balance: Most users are comfortable with a blade that has
a balance point (more accurately, the center of the moment of inertia, for
fellow nerds) close to the transition from handle to blade. If a blade is
longer than the handle it is attached to, the simplest means of maintaining
the proper balance it to taper the blade. If a blade tapers in thickness,
intuitive design dictates that it should also taper in width, maintaining a
relatively constant aspect ratio in cross section. This results in a point.
3. Mechanics of curved cuts: The minimum radius of a concave curved cut
that a knife can make is limited by the width of the blade. In order to
maximize utility, some portion of a blade should be very narrow if curved
cuts are intended. Mechanics of materials dictates that the narrow portion
should be at the end of a tapering blade; in other words, it should come to
a point.
4. Mechanics of cutting in swung blades: Blades that are intended to be
used dynamically, or swung, such as a machete, can actually require a point
for best effect. As you know, a slicing cut is most often more effective
than simply forcing a blade into a material perpendicular to the edge.
There are two reasons for this which I won't go into here; suffice to say
that in order to achieve this slicing motion in a swung blade, the cutting
edge is set at an angle to the direction of travel. This can result in a
curved blade, as in the scimitar, or more commonly, a long blade that
tapers to a point. This doesn't apply to kitchen knives, as most aren't
swung, and cleavers are intended to cut by wedging, as slicing is
ineffective on rigid materials such as bone.
I have always carried knives when I'm out and about. I also usually carry
some form of pliers, a flashlight, a pen; in one word, tools. My primary
knife is a tanto-blade 3.95" lockblade clipped into my pocket, and
sometimes it is visible. From time to time I am questioned on why I'm
carrying a weapon, and have to explain the following:
I have never, and hopefully never will use a knife in self-defense and
certainly not in anger for the simple fact that a knife is only an
effective weapon in a very few situations where you have an element of
surprise and intend to permanently disable or more likely kill your
opponent outright. I don't put myself in those type of situations.
The situation I am more likely to encounter is a belligerent attack borne
out of anger or intent of robbery. In this situation, I don't want to kill,
but only temporarily disable or merely slow down my opponent enough to get
away, a very poor task for a knife. Deep puncture wounds from stabbing or
lacerations from slicing do not disable unless very carefully placed,
leaving you with an enraged attacker, a slippery sharp blade in your hand,
and very likely legal charges of assault with a deadly weapon.
I do not think that availability of pointy knives should be placed in the
same security category as handguns for two reasons. One, long pointy
knives have more legitimate uses than defense or attack. And two, pointy
knives, or any knife, derives its effectiveness from the skill and strength
of the user. Handguns derive their effectiveness from stored chemical
energy and require almost no skill to create deadly force.
At the end of the day, security risk lies not in the tools a person uses to
attack others; it lies in the intent of the mind wielding the tools.
Deprived of one tool, a person with intent will choose another.
Mathematically, you can consider this unbounded, iteration without end;
therefore, we would be better from an efficiency standpoint to attempt to
limit the causes of intent and vulnerability to attack rather than the
tools of attack.
From: Rob Isaac <[email protected]>
Subject: Re: Risks of Pointy Knives
Why are long knives pointy? Mechanical engineering, cost efficiency, and
tradition.
European long knives are traditionally made by a stock removal method --
the cutting edge is created by grinding away metal to reach the shape of
the blade. Knives are pointy at the end because it's easier to reach that
shape when you're grinding the edge into a curve.
There's also a cost implication, because although the point of a long knife
is rarely used to stab anything in a cooking context, the cutting surface
is used all the way to the end of the knife, which naturally leads to a
point. If you want to make a knife that's missing the last half inch or so
of cutting edge, then you really need to make the whole knife a half inch
longer to achieve the same utility. The stock removal approach means you
have to start with a bigger piece of steel.
The tradition aspect is simple. Knives of any kind are evolved from
designs that are thousands of years old, and people's impressions of what a
knife should look like and how it should be used are hard to
change. There's no universally agreed point at which a knife becomes too
long to be used for stabbing things as well as cutting them. When most of
the well-known, high quality mass-produced chefs knives in the world are
made in the same handful of German towns they've been made in for the past
three hundred years, and people are still buying them, there's little
incentive to mess with the formula.
From: Anonymous
Subject: Re: Public Disclosure of Personal Data Loss
Bruce, your comments on Data Loss were spot on. Yes, it has been going on
for years and yes, the sensitivity of the public to such losses will decline.
You closed with, "Public disclosure is good. But it's not enough." The
answer to your implied question about how we solve this mess currently lies
in regulatory oversight. Most of the companies that have suffered public
disclosures of personal data loss are financial service organizations
governed by regulators. Behind the scenes, the regulators are making it
very clear that they are dissatisfied with the current levels of controls
over personally identifiable information and expect significant changes to
be made. The regulated companies are responding, because they have to.
Those companies that have suffered losses, but which are not regulated
(e.g., ChoicePoint), clearly do not want such incidents to provide a reason
for Congress to add them to the list of regulated entities. This provides a
clear incentive for the non-regulated companies to make changes.
The other driving force is outsourcing. No country supports the outsourcing
of jobs to another country and will use any excuse to prevent or limit the
loss of jobs. One argument that is receiving a great deal of attention in
Congress is that the offshore outsourcing companies have poor security and
present an increased risk of data loss. Whether the argument is based in
fact or not, it attracts significant public support. Any company that is
heavily dependent on offshore outsourcing of personal information
processing understands the potential risk that the government may place
significant limitations on moving data offshore and realizes that it must
take steps to ensure the public that their data is protected. In most
cases, if the company devises ways to protect data as it moves offshore, it
will be able to use the same processes domestically.
I'm not worried about whether U.S. companies get the message. I'm more
worried about whether they will be able to devise solutions quickly enough
that effectively and efficiently address the issue. Because if they are
unsuccessful, we should we all go out and buy stock in Brinks.
From: "Nick Swift" <[email protected]>
Subject: Re: REAL ID
In response to Petri Aukia on IDs: There is a subtle difference you have
not alluded to with regards to the European and American driver's licenses
and their privacy implications.
The Finnish and French (most likely all other EU driver's licenses as well)
do not have the home address of the driver. They serve to document your
existence, name, photo, signature, Social Security number, and the types of
vehicles you are allowed to drive. Pictograms and standardized numbers and
locations of datum are used so that a patrol officer can read a license
from any EU country.
Each country has a mechanism to map from the Social Security number or the
local equivalent to the current home address of the driver, but this is
available only to the government and the companies you have given the right
to know of your address (magazines, newspapers, and the like).
UK driving licenses show the holder's home address -- this is item 8 in the
EU model license. This item is optional but appears on many photo licenses:
e.g., this document about Spain.
<http://europa.eu.int/comm/transport/home/drivinglicence/legislation/doc/2003_10_22_memo_drivinglicence_en.pdf>
or <http://tinyurl.com/55xkw>
The actual requirements for a license are shown here:
<http://europa.eu.int/eur-lex/en/consleg/pdf/1991/en_1991L0439_do_001.pdf>
or <http://tinyurl.com/8lcc7>
Note that Social Security number is not required to be part of the license.
From: Brad Knowles <[email protected]>
Subject: Re: REAL ID
In the "Comments from Readers" section, Julien Maisonneuve said: "In
addition to your mention of European legal frameworks protecting data
(which are not as complete and as prevalent across the union as one may
wish), the very notion of identity theft is almost unknown in Europe. There
are many causes, many linked to the limited benefits you can draw from
'identity' by itself. This is including the absence of credit rating as it
exists in the U.S., and different procedures to open bank accounts and get
access to their resources."
There are other side-effects to this issue. For one, knowing someone's
bank account number is enough to be able to send them money, but not
withdraw it. Many businesses will print their bank account numbers on
their letterhead, and some people will put their bank account numbers on
their business cards. There's no risk of having this information "stolen,"
because the banks don't allow you to withdraw money by knowing only the
bank account number, and this makes it much easier to transfer money to
someone electronically. This is a large part of the reason why no one uses
checks anymore in Europe -- it's faster and easier to transfer the money
electronically.
On the other hand, trying to set up electronic payment to U.S. accounts is
a pain-in-the-ass. I've tried to do it through my bank. If they already
have a record of the organization in question, it may only take two or
three months to set up electronic billing and payment. It's not nearly so
painful to do that in Europe.
Many European banks will create their own customized software to do all
electronic banking, and this software will not only run on Windows but also
on Macintosh and Linux. Just about everything you can do by going to an
ATM or visiting a branch in person can be done with this software, either
in offline mode or in the online module.
There's another side-effect -- European banks and money lending
institutions don't validate credit cards online. They have to go through a
manual process which takes hours to days to process, frequently involving
manual intervention and the use of fax machines. This makes it very painful
to do online shopping when the merchant requires online validation. This
makes it impossible to use any online storefront where online validation is
the only choice available.
Even though they're Visa cards, and they have the Visa logo and hologram on
them, they're not recognized as Visa cards because the first few digits of
the card indicate that they are not issued to a U.S. banking
institution. If you rent cars from Avis, just tell them that the renter's
address is overseas, and you can rent a vehicle on a check card, which is
something that they don't normally allow.
** *** ***** ******* *********** *************
CRYPTO-GRAM is a free monthly newsletter providing summaries, analyses,
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Please feel free to forward CRYPTO-GRAM to colleagues and friends who will
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it is reprinted in its entirety.
CRYPTO-GRAM is written by Bruce Schneier. Schneier is the author of the
best sellers "Beyond Fear," "Secrets and Lies," and "Applied
Cryptography," and an inventor of the Blowfish and Twofish algorithms. He
is founder and CTO of Counterpane Internet Security Inc., and is a member
of the Advisory Board of the Electronic Privacy Information Center
(EPIC). He is a frequent writer and lecturer on security topics. See
<http://www.schneier.com>.
Counterpane is the world's leading protector of networked information - the
inventor of outsourced security monitoring and the foremost authority on
effective mitigation of emerging IT threats. Counterpane protects networks
for Fortune 1000 companies and governments world-wide. See
<http://www.counterpane.com>.
Crypto-Gram is a personal newsletter. Opinions expressed are not
necessarily those of Counterpane Internet Security, Inc.
Copyright (c) 2005 by Bruce Schneier.