Help with JPEG Stego app?
Romana Machado
romanafirst at gmail.com
Mon Sep 2 11:41:47 PDT 2013
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 <adam at cypherspace.org> 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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