From owner-freebsd-security Sun May 31 15:04:47 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id PAA00227 for freebsd-security-outgoing; Sun, 31 May 1998 15:04:47 -0700 (PDT) (envelope-from owner-freebsd-security@FreeBSD.ORG) Received: from gatekeeper.alcatel.com.au (gatekeeper.alcatel.com.au [203.17.66.1]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id PAA29848 for ; Sun, 31 May 1998 15:03:19 -0700 (PDT) (envelope-from peter.jeremy@alcatel.com.au) Received: from mfg1.cim.alcatel.com.au ("port 1260"@[139.188.23.1]) by gatekeeper.alcatel.com.au (PMDF V5.1-7 #U2695) with ESMTP id <01IXPR0IG01S001Y1L@gatekeeper.alcatel.com.au> for freebsd-security@FreeBSD.ORG; Mon, 1 Jun 1998 08:02:40 +1000 Received: from gsms01.alcatel.com.au by cim.alcatel.com.au (PMDF V5.1-10 #U2695) with ESMTP id <01IXPQZMG6FKI3SYZA@cim.alcatel.com.au> for freebsd-security@FreeBSD.ORG; Mon, 01 Jun 1998 08:01:58 +1000 Received: (from jeremyp@localhost) by gsms01.alcatel.com.au (8.8.8/8.7.3) id IAA01058 for freebsd-security@FreeBSD.ORG; Mon, 01 Jun 1998 08:02:18 +1000 (EST) Date: Mon, 01 Jun 1998 08:02:18 +1000 (EST) From: Peter Jeremy Subject: Re: MD5 v. DES? To: freebsd-security@FreeBSD.ORG Message-id: <199805312202.IAA01058@gsms01.alcatel.com.au> Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Sat, 30 May 1998 11:33:49 +1000 (EST), "Daniel O'Callaghan" wrote: > The reason >that hashing is exportable is that it is only useful for identification >and integrity, not privacy. That is the official line, but it was obviously written by someone who hadn't studied much cryptography. Cipher feedback and output feedback block ciphers use identical functions for both encryption and decryption. This function can just as easily be a one-way hash of the key and text as a traditional encryption of text using key. Peter -- Peter Jeremy (VK2PJ) peter.jeremy@alcatel.com.au Alcatel Australia Limited 41 Mandible St Phone: +61 2 9690 5019 ALEXANDRIA NSW 2015 Fax: +61 2 9690 5247 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe security" in the body of the message