Article View: sci.crypt
Article #539Re: choosing passwords (was: Re: Crypt should be based on MD5)
From: Thomas Hagadorn
Date: Thu, 30 Jul 1992 13:31
Date: Thu, 30 Jul 1992 13:31
29 lines
1463 bytes
1463 bytes
In article <1992Jul26.202154.15664@sfu.ca> erick@fraser.sfu.ca (Erick Bryce Wong) writes:
|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 /
|
Almost, make that:
/ #digits \
/ __ \
11 - c = ( \ a * i ) mod 11
\ /_ i /
\ i=1 /
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Path: arc1-ca.pugleaf.net!sparky!uunet!darwin.sura.net!europa.asd.contel.com!news.ans.net!cmcl2!adm!amsaa-cleo!hagadorn From: hagadorn@amsaa-cleo.brl.mil (Thomas Hagadorn) Newsgroups: sci.crypt Subject: Re: choosing passwords (was: Re: Crypt should be based on MD5) Message-ID: <8350@amsaa-cleo.brl.mil> Date: 30 Jul 92 13:31:11 GMT References: <R8ZgoB3w165w@elrond.toppoint.de> <yZoioB1w165w@elrond.toppoint.de> <1992Jul26.202154.15664@sfu.ca> Organization: Army Materiel Systems Analysis Activity Lines: 29