sci.crypt archive
Re: Generating Prepaid Card Numbers
From: karl malbrain <malbrain@yahoo.com>
Date: Tue Dec 20 2005 - 18:11:52 CET
Date: Tue Dec 20 2005 - 18:11:52 CET
Michael Fork wrote:
> > Assuming you have 14 digits available to define the sample space, you
> > should be able to generate a billion card numbers with less than 1 in
> > 10000 chance of a collision. The suggestion of using AES over the
> > activation numbers is OK assuming you can keep the key you use a
> > secret. I don't think you need CTR mode.
>
> Is there an advantage to using AES over a hardware based RNG, which has
> no key to keep secret?
No. karl m
Received on Fri Dec 23 20:11:15 2005