Re: Pin generation algorithm question
From: Andrew Swallow (am.swallow_at_eatspam.btinternet.com)
Date: 04/23/04
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Date: Fri, 23 Apr 2004 18:11:59 +0000 (UTC)
"Michael Amling" <nospam@nospam.com> wrote in message
news:Dxbic.1189$%K7.217@newssvr15.news.prodigy.com...
> Ernst Lippe wrote:
> > Like you said the best way is to minimize the number of secrets.
> > When the system contains a list of issued tokens, you will have
> > to worry about all the places where this list is used. When
> > you use a keyed algorithm you only have to worry about the
> > key, that you could store in some nice piece of crypto hardware.
>
> I have such a 16-digit "PIN" on a small card in front of me as I
> type. Once the number was decided on, it had to be printed on a small
> card, packaged to make the number unreadable before purchase, had a
> second unique number (SUN?) printed on the package, distributed to a
> retailer, put on a shelf, and taken to a cashier who scanned the SUN
> which activated the PIN. Weeks later I typed the PIN into a cell phone.
> I don't know if the OP's system will use SUNs or activation, but if
> so, the SUN/PIN activation process also needs attention to security.
> The small card also has a 24 decimal digit "Serial Number". I've
> discarded the package, so I don't know if it matches the SUN.
>
There are other things that can be done such as giving the
shops small printers which type out the number when the
token is paid for. Encryption needed between HQ, shop and
printer.
Andrew Swallow
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