Revenue opens the packet, and authenticates the customer s digital certificate against a central register of dig. If cert exists and is not revoked, then signature is authentic. A 1024 bit digest is created out of the full document. This digest is then encrypted using the customer private key. Revenue decrypts using the cust public key.
Revenue takes the message again and recreates the digest using the customer s public key.
The Non-Repudiation Signed and encrypted packet including the customer s digital certificate is timestamped and stored in a write once storage device. The code which carries out this procedure is also independently audited.