From owner-freebsd-hackers@FreeBSD.ORG Fri Dec 28 13:12:52 2007 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5105A16A419; Fri, 28 Dec 2007 13:12:52 +0000 (UTC) (envelope-from aryeh.friedman@gmail.com) Received: from mta5.srv.hcvlny.cv.net (mta5.srv.hcvlny.cv.net [167.206.4.200]) by mx1.freebsd.org (Postfix) with ESMTP id 186A713C469; Fri, 28 Dec 2007 13:12:52 +0000 (UTC) (envelope-from aryeh.friedman@gmail.com) Received: from flosoft.no-ip.biz (ool-435559b8.dyn.optonline.net [67.85.89.184]) by mta5.srv.hcvlny.cv.net (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) with ESMTP id <0JTR00MMVGPECYR0@mta5.srv.hcvlny.cv.net>; Fri, 28 Dec 2007 08:12:51 -0500 (EST) Received: from flosoft.no-ip.biz (localhost [IPv6:::1]) by flosoft.no-ip.biz (8.14.2/8.14.2) with ESMTP id lBSDCniM058687; Fri, 28 Dec 2007 08:12:50 -0500 Date: Fri, 28 Dec 2007 08:12:49 -0500 From: "Aryeh M. Friedman" In-reply-to: <9bbcef730712280510v14806e7exb960f5da5f05e4d@mail.gmail.com> To: Ivan Voras Message-id: <4774F651.7060905@gmail.com> MIME-version: 1.0 Content-type: text/plain; charset=UTF-8 Content-transfer-encoding: 7BIT X-Enigmail-Version: 0.95.5 References: <5950EE0C-383D-4D6B-9991-A0DEABD2ADE4@u.washington.edu> <20071228003716.GB48997@lor.one-eyed-alien.net> <4774EF27.90307@gmail.com> <9bbcef730712280454w6b6f5e17s33631223d5571f83@mail.gmail.com> <4774F42C.5030105@gmail.com> <9bbcef730712280510v14806e7exb960f5da5f05e4d@mail.gmail.com> User-Agent: Thunderbird 2.0.0.9 (X11/20071217) Cc: freebsd-hackers@freebsd.org Subject: Re: BSD license compatible hash algorithm? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Dec 2007 13:12:52 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Ivan Voras wrote: > On 28/12/2007, Aryeh M. Friedman wrote: > >> Matter of fact this weakness is the main avenue of attack on >> cryptographic hashes see http://eprint.iacr.org/2004/199.pdf A >> slightly off topic side note NIST is having a contest to attempt >> to mitigate these issues in "SHA-3" see: >> http://csrc.nist.gov/groups/ST/hash/sha-3/index.html. Currently >> there only 4 teams that have expressed interest in entering >> perhaps this will get more interest. > > All of this is true but it's not very useful for hash tables > (crypto-strength hash functions are generally too slow for the > purpose) :) > Depends on the size of the table... I work with a algrothem that regularly has tables between 2^32 and 2^64 buckets (even though the we use a slightly different terminology) - -- Aryeh M. Friedman FloSoft Systems http://www.flosoft-systems.com Developer, not business, friendly -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHdPZRzIOMjAek4JIRAnB+AJ0Z838CZiWAYdKURNpTM6/XMMbYvgCfSpQl QDhOMxfzc+Y9vd+KKwphezs= =g+cW -----END PGP SIGNATURE-----