Stegger

Steganography made simple for Node.JS

About#

Stegger is a steganographic utility for Node.JS, to conceal encrypted text within JPEG images (yes, JPEG!). It wraps around the UNIX utility, outguess.

I couldn't find a working existing module on npm, so I made my own. =

About Steganography#

Stegaography is the art of concealing data within ordinary looking objects, such that the original file does not appear to be tampered with. See http://en.wikipedia.org/wiki/Steganography for more information.

Example##

Before:

After:

Encrypted message: 'hello world (안녕하세요! 잘지네세요?)'

Installation#

1. Install outguess with your relevant package manager. This can be done in Ubuntu via:

   sudo apt-get install outguess

2. Install from npm:

   npm install stegger

3. You're all set! Load a picture, and get swagging!

Documentation#

Check out the examples directory. The example provided, tests the encrypt() and decrypt() function sequentially. This is done via asynchronous sequences.

Easy to use - just call either encrypt() or decrypt(). Pass in the relevant argument object. Listen for the promise callback.

Issues#

None at the moment. Post any via the bug tracker.

Security##

How secure is it? Well, pretty secure.

1. Text is encrypted with AES-256 cipher and salted.
2. Text is concealed within least-probable detected areas and salted with a second salt.
3. Image would have to be earmarked as having embedded information (hard), before being cracked.

Credit#

Joel Haowen TONG (me [at] joeltong [dot] org)