sci.crypt archive
Re: Generating Prepaid Card Numbers
From: Michael Fork <mjfork@gmail.com>
Date: Tue Dec 20 2005 - 03:29:19 CET
Date: Tue Dec 20 2005 - 03:29:19 CET
> 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?
Received on Fri Dec 23 20:11:10 2005