17 Dec
2003
17 Dec
'03
11:17 p.m.
At 06:46 PM 12/20/97 -0700, Johnson, Michael P (Mike) wrote:
cfb Ciphertext feeback mode c[i] = f1(K, c[i-1]) ^ p[i] p[i] = f1(K, c[i-1]) ^ c[i]
Suppose instead of c[i-1] you use c[i-N] where N is say 10. How would you prove that this has no security implications? That 10-way interleaved cfb streams are security-equivalent to a single cfb stream interleaved with the immediately previous block? ------------------------------------------------------------ David Honig Orbit Technology honig@otc.net Intaanetto Jigyoubu "Windows 95 is a technologically complex product that is best left alone by the government..." ---MSFT Atty B. Smith