Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request
From: af@sei.ucl.ac.be (Alain FONTAINE (Postmaster - NAD))
Newsgroups: comp.dcom.telecom
Subject: Re: ATM at Retailers (was: Voice Mail Passwords)
Message-ID: <12812@accuvax.nwu.edu>
Date: 28 Sep 90 16:22:09 GMT
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Organization: TELECOM Digest
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X-Telecom-Digest: Volume 10, Issue 696, Message 12 of 14


A recent Digest article noted:

>One way encryption is very common.  You store the encrypted PIN on the
>card.  Then when the user enters his PIN, it is encrypted using the
>same algorithm.  If the two encrypted PINs match, the original PINs
>were the same.

Homework : with four digits PIN'S, how many milliseconds of Sparc time
does one need to make an exhaustive search ?  


AF