Article View: sci.crypt
Article #1327Re: Secure 32-bit checksum needed
From: Bruce Schneier
Date: Sun, 04 Oct 1992 14:35
Date: Sun, 04 Oct 1992 14:35
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In article <bontchev.717961294@fbihh> bontchev@fbihh.informatik.uni-hamburg.de writes: >Hello, everybody! > >I need a 32-bit cryptographically strong checksum. I guess that I >could run MDx or SHS on my message and get 32 bits from the result >(which is 128 and 160 bits respectively). The question is - which 32 >bits should I take? Obviously, there are a few options: > > >3) 32 bits from the middle. >4) 32 bits, collected from random positions. Take whatever bits you like. It doesn't really matter. (Actually, I would suggest XORing each section of 32-bits together and takingthe result.) Bruce
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Path: arc1-ca.pugleaf.net!sparky!uunet!dtix!darwin.sura.net!spool.mu.edu!sdd.hp.com!ux1.cso.uiuc.edu!uchinews!machine!chinet!schneier From: schneier@chinet.chi.il.us (Bruce Schneier) Newsgroups: sci.crypt Subject: Re: Secure 32-bit checksum needed Message-ID: <BvLpvv.27I@chinet.chi.il.us> Date: 4 Oct 92 14:35:54 GMT References: <bontchev.717961294@fbihh> Organization: Chinet - Public Access UNIX Lines: 16