17 Dec
2003
17 Dec
'03
11:17 p.m.
Matthew Ghio wrote:
Antonomasia <ant@notatla.demon.co.uk> wrote:
How are you planning to detect which bytes are passed in this way ? Chosen plaintext attacks would do it, and show where (a+b)^(a0+b0) == 0. Looks like you've just doubled our progress.
It doesn't take chosen plaintext, just known plaintext.
Even in the case where this doesn't work, you can simply collect all 128 plaintext/ciphertext pairs for the first byte (if you can get enough known plaintexts)