Article View: sci.crypt
Article #506Re: choosing passwords (was: Re: Crypt should be based on MD5)
From: Erick Bryce Wong
Date: Sun, 26 Jul 1992 20:21
Date: Sun, 26 Jul 1992 20:21
23 lines
1191 bytes
1191 bytes
freitag@elrond.toppoint.de (Claus Schoenleber) writes:
>The last digit c of an ISBN is a (weighted) checksum MOD 11:
>
>[a is digit a at position i, i=10 is leftmost]
> i
>
> [ / 10 \ ]
> | / __ \ |
>c = | 11 - ( \ a * i ) mod 11 | mod 11
> | \ /_ i / |
> [ \ i=2 / ]
You can put this in slightly simpler terms if you define i=1 to be the leftmost
position, then the formula becomes (I think):
/ #digits \
/ __ \
c = ( \ a * i ) mod 11
\ /_ i /
\ i=1 /
--
-- Erick, the perfect square :-)
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Newsgroups: sci.crypt,comp.security.misc Path: arc1-ca.pugleaf.net!sparky!uunet!destroyer!ubc-cs!newsserver.sfu.ca!erick From: erick@fraser.sfu.ca (Erick Bryce Wong) Subject: Re: choosing passwords (was: Re: Crypt should be based on MD5) Message-ID: <1992Jul26.202154.15664@sfu.ca> Sender: news@sfu.ca Organization: Simon Fraser University, Burnaby, B.C., Canada References: <R8ZgoB3w165w@elrond.toppoint.de> <yZoioB1w165w@elrond.toppoint.de> Date: Sun, 26 Jul 1992 20:21:54 GMT Lines: 23