Help with JPEG Stego app?
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
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
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@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
Pixelknot. Android stego app with source. https://github.com/guardianproject/pixelknot On Sep 2, 2013 2:45 PM, "Romana Machado" <romanafirst@gmail.com> wrote:
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@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
Awesome, thanks! Why was old school F5 chosen vs QIM or others? Romana Machado 310-940-7888 On Sep 2, 2013, at 12:38 PM, Lee Azzarello <lee@guardianproject.info> wrote:
Pixelknot. Android stego app with source.
https://github.com/guardianproject/pixelknot
On Sep 2, 2013 2:45 PM, "Romana Machado" <romanafirst@gmail.com> wrote:
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@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
On 09/02/2013 08:04 PM, 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).
Cool. You might be interested in my GSoC project, the "Steganography Browser (Extension)". Our student could definitely use help, it would be a shame to not join efforts. So far, he's been concentrating on the UI parts. Recently, he added SJCL. We've been holding back on including any steganography library, but the design should allow to plug-in libraries flexibly for varying content types. https://github.com/rharishan/Steganography-Browser https://lists.torproject.org/pipermail/tor-dev/2013-May/004939.html #tor-stego on irc.oftc.net It would be great to receive a review and a hand in guiding the student; we are two mentors, but we both don't have much time. :-( --Mo
participants (4)
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Adam Back -
Lee Azzarello -
Moritz -
Romana Machado