Re: Efficent Digital Signature Schemes.....

From: Paul Rubin (//phr.cx@NOSPAM.invalid)
Date: 02/22/03 

From: Paul Rubin <http://phr.cx@NOSPAM.invalid>
Date: 21 Feb 2003 18:26:34 -0800

Paul <paul@null.org> writes:
> Does anyone make a 1024 bit modular multiplier as a small cheap add on
> chip? The Java I Botton looks cool, but it is about >$40.00 in small
> quantiites and would account for a significant portion of the total
> bill of material.

There are smart card chips in the $5 range that can do RSA signatures
but don't have as many features or as much security as the Java
button. Or the box on the plane could just spit out a hash encrypted
by a secret key. The hash would then be decrypted and signed by a
separate computer held by the certifying organization.

See www.basiccard.com for some smart card stuff that's easy to develop
with and is fairly cheap in small quantity.

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