Re: FontForge encryption

Daniel Kahn Gillmor <[email protected]> Sun, 09 Nov 2014 07:45:33 -1000

Newsgroups	gmane.comp.fonts.fontforge.devel
Message-ID	<[email protected]>

On Sat 2014-11-08 03:53:04 -1000, Jose David Bravo A wrote:

> I have a font (woff) and I want to edit that font to change the mapping. 
>
> Ie, the letter A match the bitmap of the letter B, letter B match the bitmap of the letter C, etc. 
>
> With that, the only way to read a document will be having the font. Is possible to do that with font-forge using command line? 

I note that your subject line is "FontForge encryption".

The mechanism you describe is effectively what's known as a "caesar
cipher" -- while it is arguably a form (an ancient form) of encryption,
it is known to be trivially vulnerable to many forms of cryptanalysis.
That is, a modern cryptographer would not consider this to be effective
encryption at all.

I recommend against calling this "encryption" at all so that you avoid
giving people who might stumble across this neat trick the wrong idea
about the security or safety of the process against even an
marginally-competent adversary.

Regards,

      --dkg

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