Patent ID: 6362724
Filing Date: 2002-03-26
Classification: G07B

Abstract:
A security module for securing computerized postal registers against manipulation, comprising:a first data processing unit containing an internal memory; a second data processing unit; a non-volatile memory and a program memory containing a program, each connected to said first data processing unit and to said second data processing unit; said first data processing unit and said second data processing unit participating in a plurality of accounting operations resulting in postal register data being stored in said non-volatile memory, and said first data processing unit operating according to said program to check validity of postal register data stored in said non-volatile memory from a previous accounting procedure, and to calculate new postal register data in advance of a current accounting procedure if said postal register data stored for said previous accounting procedure are validated, and to form a code dependent on said new postal register data and to store said code in at least one of said non-volatile memory and said internal memory; and said second data processing unit operating according to said program to form postal register data for said current accounting operation and to store said postal register data for said current accounting operation in said non-volatile memory associated with said code.