On Tue, May 08, 2001 at 01:01:34AM -0500, Scott Gregory Miller wrote: > > > > * to pad data to a power of 2, you repeat the data > > > No. This lends an attack as well, since the attacker can try and assume > > > that several of the last blocks of the file are the same. > > > > Does that matter given that the mode we are using is rolling? > Yes, since its only rolling within a block. After two blocks you start > getting the same encryption (your XORing all zeros, so you're essentially > just encrypting as a stream cipher). I'm not saying this does give a > cryptanalyst any info, but it might.
" * to pad data to a power of 2, you repeat the data" How does that involve XORing all zeros? Repeating the same data will not cause the ciphertext to repeat as far as I can tell... <> -- 'DeCSS would be fine. Where is it?' 'Here,' Montag touched his head. 'Ah,' Granger smiled and nodded. Oskar Sandberg md98-osa at nada.kth.se _______________________________________________ Devl mailing list Devl at freenetproject.org http://lists.freenetproject.org/mailman/listinfo/devl >From - Wed May 9 12:58:16 2001 X-UIDL: 3adbdd6c000004ef X-Mozilla-Status: 0011 X-Mozilla-Status2: 00000000 Return-Path: <devl-admin at freenetproject.org> Received: from hawk.freenetproject.org (postfix@[4.18.42.11]) by funky.danky.com (8.9.3/8.8.7) with ESMTP id UAA05648 for <danello at danky.com>; Tue, 8 May 2001 20:53:15 -0400 Received: from hawk.freenetproject.org (localhost [127.0.0.1]) by hawk.freenetproject.org (Postfix) with ESMTP id CC2F157FEE; Tue, 8 May 2001 18:33:10 -0700 (PDT) Delivered-To: devl at freenetproject.org Received: by hawk.freenetproject.org (Postfix, from userid 500)
