Adding ditigal signatures to records.

From: Rui Pinto (ruifgpinto@iol.pt)
Date: 09/03/02 

From: "Rui Pinto" <ruifgpinto@iol.pt>
Date: Tue, 3 Sep 2002 09:28:13 -0700

Hi,
I want to know if it's possible to add a digital signature
to a record in sql 2000, that when the record is changed
the signature is broken?

If it's not possible then how can i garantee that the
record is not changed?