Hartmut Dr. Rer. Nat. Schrenk

Method for the authentication of one participant by another participant in an information transfer system according to the Challenge-Response principle

Method and data carrier assembly for validating memory chips

Method and circuit to protect EEPROM memories against devaluation manipulation

Method for preventing unauthorised data modification in an apparatus with a non-volatile memory

Method and circuitry for producing a pseudo random sequence and its use

Method and data carrier for checking the authenticity of chip memories

Method and device for increasing the counting cycle possibilities of a non-volatile digital counter.

Method for the irreversible blockage of the execution of particular memory operations in monolithically integrated microcomputer circuits

Procédé et dispositif pour obtenir une séquence pseudo-aléatoire ainsi que son utilisation

Method and circuit for counting down the value of a debit-card