Hiding and Seeking
               Pseudo-Random LSB Embedding
OutGuess 0.1 algorithm:
Pseudo-random changes to LSB of DCTs.
Not detectable by Chi-square test.
[Provos, 1999]         


Extended Chi-square test is more sensitive to partial distortions.
[Provos, 2001]         
Two identical distributions produce similar Chi-square values in any part of the distribution.
Instead of increasing sample size, use constant sample size and slide position where samples are taken.