Re: Better captcha for WOT

> On 20-07-16 17:05, [email protected] wrote:
>> Google research declares the simple text captcha dead. They remain
>> difficult for human beings, but machine learning can crack them 99.9% of
>> the time.
>
> While probably true, no captcha abuse on WoT has been documented so far.
>
>> I propose a better captcha for WOT that works like:
>
> Thank you for considering how WoT can be improved. Your proposal is not
> immediately clear to me; I'll fire some questions and state some of my
> doubts to get a better understanding.
>
>> - The challenge to be solved: Add the numbers presented in the puzzle
>> series that ONLY show trees.
>
> I don't see what benefit having to add numbers brings over recognizing
> characters. Digits are easier to recognize for computers (for there are
> only 10 of them, compared to our 26 character alphabet), and addition is
> a trivial task for computers as well.
>
>> - It presents 5-10 puzzles. The legit puzzles randomly sprinkled
>> throughout.
>
> What do you mean by randomly sprinkled legit puzzles? All puzzles in WoT
> are supposed to be legit. What purpose would a non-legit puzzle have? Or
> do you envision a series of multiple "puzzles" within a single
> captcha-like image?
>
>> - What puzzles look like: A number is drawn across an image backdrop of
>> trees and other objects.
>>
>>
>> That should raise the bar and not be hard to switch to.
>
> In my humble opinion, this statement is far from the truth.
>
> Consider a finite set of "tree" and "non-tree" images that is to be
> shipped with WoT. This reduces your proposal to a captcha with an
> alphabet extended to the cardinality of the set of images, however
> operating on image similarity (and known classification information on
> whether the image is a tree or not) instead of character similarity.
>
> The strength of captcha alternatives that are based on identification of
> image contents, relies on the assumption that the image set (in other
> words, the classification data) is kept private. This cannot be done for
> WoT (the attacker could always download the source after all!), unless
> each user would have to supply their own source of captcha images —
> which would make setup unnecessarily hard.
>
> Kind regards,
> Bert
>
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I got nothin' :) The idea was poorly thought out. Thanks for your time
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