Perry E. Metzger writes:
Igor Chudov writes:
What is Alice and Bob decide to obscure their letters and add random NON-ASCII characters at random places?
Assuming I'm using a statistics based technique, that won't help.
Some fairly basic questions: 1) Is a statistical test like this done on the net composition of the whole message or locally, point by point throughout the text (for example, using a window)? 2) If what's tested is the net composition of the message, could you choose padding to normalize a message back to an apparently random distribution? 3) What kind of computation overhead does this statistical testing impose (compared to what would be needed for a known-plaintext search)? Thanks, Joel/ -- ===================================================================== Joel.Morgan@Helsinki.FI http://blues.helsinki.fi/~morgan "Over the mountains there are mountains." -- Chang-rae Lee =====================================================================