Re: Underhanded C Contest 2008 - sample source code included

Christian.Buchner@xxxxxxxxx wrote:

The underhanded C contest <snip>, full details available here:

http://underhanded.xcott.com/

So apparently this contest can be approached with an attempt at
steganography, this is why I am posting this to sci.crypt - one major
difficulty however was to hide the malicious intent in the source
code.


Here are the technical details:

I use spread spectrum steganograpy using 256 bit Gold sequences (these
are also used in communications engineering, e.g. WCDMA). The code
sequences are permuted all over the cover image using the state of a
linear feedback shift register.

Your approach sounds fair enough in principle. It may suffer from some practical choices (such as not hiding any data in the redacted parts of the image), because a test redacting 52% of the input resulted in a badly mangled (i.e. not usable) unredacted output...
--
"Relax, kick back, and have a nice big frosty mug full of STFU."
-Re:Animator/NANAE/9-3-07
.

Quantcast