Niels Provos
Tue, 20 Feb 2001 08:29:40 -0800
In message <[EMAIL PROTECTED]>, David Honig writ es: >1. Measure at the stats on the least significant bits from your cover >source. >2. Shape the uniform distribution you get after encryption into >the form you observe from your coverbits. >3. Replace. This approach is flawed. The distribution of the least significant bits depends on words from which the LSBs originate. If you consider only the statistics of the least significant bits, you will distort statistics based on the whole data set. You can find a paper that I wrote about the topic at http://www.citi.umich.edu/u/provos/cv.html#papers OutGuess, http://www.outguess.org/, is an implementation that will preserve such statistics. It also ensures that the results from, e.g. Maurer's Universal test do not change significantly. Greetings, Niels.