Re: Basic tools of encryption: Transposition and substitution?

Joseph Ashwood wrote:
>With compression the likelihood of original plaintexts taht were
>the same length resulting in different lengthed ciphertexts becomes very
>high, and so an attacker can derive information about the plaintext as a
>result, resulting in what I called Side Band Leakage.

Indeed. Here's a nice paper on the subject:

John Kelsey, "Compression and Information Leakage of Plaintext", FSE 2002.

Unfortunately I cannot find a copy of this online, but you might be able
to request a copy from the author or read it in the FSE proceedings.
Received on Tue Jan 3 03:42:45 2006