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Help with JPEG Stego app?



Here's the Javascript PGP library I've chosen. I expect the 128 bit setting will be sufficient. Comments welcome as always. 

http://crypto.stanford.edu/sjcl/

Romana Machado
310-940-7888


On Sep 2, 2013, at 11:18 AM, Adam Back <[email protected]> wrote:

> PGP stealth by Henry Hastur has the stego support for pgp2 formats and RSA. (Aside from stripping boiler plate Hal Finney had observed that you have to
> make sure the RSA encryption part doesnt narrow down which key it could be
> addressed to.  (A message m > user A's n public value could not be addressed
> to A (as m is computed mod n, it is always < n)).
> 
> Its C code, quite old and not really maintained but perhaps you could use it
> for comparison or ideas.
> 
> http://www.cypherspace.org/adam/stealth/
> 
> Adam
> 
> On Mon, Sep 02, 2013 at 11:04:05AM -0700, Romana Machado wrote:
>>  I've decided to upgrade my project, Stego, conceived as  an
>>  easy-to-use, near-universally available, maximally browser compliant,
>>  message PGP encrypted, steganography web app, to encode JPEGs, the most
>>  universal image format today (in cell phone cameras, and all over the
>>  web). Which means I have to decipher information-dense papers, pick a
>>  suitable algorithm, and code it up in client-side Javascript. Which
>>  greatly increases the workload, but I expect I'll be a better engineer
>>  for it. It also means that I'll be reusing none of the original code.
>>  Fortunately there are a few open source Javascript JPEG libraries. I'm
>>  writing to ask for help with picking the stego algorithm, hoping that
>>  someone here has a knowledgable opinion.
>>  Romana Machado
>>  310-940-7888
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