Cryptography – Having production of printed copy
Patent
1995-09-08
1998-09-08
Gregory, Bernarr E.
Cryptography
Having production of printed copy
380 2, 380 4, 380 23, 380 25, 380 49, 380 50, 380 51, 705401, 705405, 705408, 705410, H04L 900
Patent
active
058057110
ABSTRACT:
A method for securing data and program code of an electronic postage meter machine against manipulation, having a microprocessor in a control unit of the postage meter machine for implementing steps for a start and initialization routine and following system routine with a possibility of entering into a communication mode with a remote data central, as well as further input steps in order to enter into a franking mode from which a branch is made back into the system routine after the implementation of an accounting and printing routine, includes conducting a start security check within the framework of a start and initialization routine which runs before a secure printing data call routine and the following system routine for determining the validity of a program code and/or of data in the predetermined memory location and of an appertaining MAC (message authentification code) that is present in the same storage medium. The check for valid program code and/or for validity of the data is implemented with a selected checksum method within an OTP (one time programmable) processor that internally receives the corresponding program parts. Transfer of the postage meter machine into the aforementioned system routine takes place given validity of the data or transfer of the postage meter machine into a first mode when the data are invalid, or when a specific manipulation criterion is met. Steps for preventing the franking or blocking of the postage meter machine and/or steps for preventing a further program execution or a program branch exiting the OTP processor within the framework of system routine the occur.
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Berthold Arndt
Bischoff Enno
Freytag Claus
Gunther Stephan
Hansel Marcus
Francotyp-Postalia AG & Co.
Gregory Bernarr E.
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