U.S. Philips Corporation

Oberthur Technologies

De La Rue Cartes Et Systems Sas

Joseph Hoppe

Marc Bertin

Ronald Ferreira

Denis R Pottier

Jean-Louis Goudard

A portable secured electronic unit includes at least two electronic components, one of which is embodied in the form of a primary electronic component and the second in the form of an interface electronic component, wherein the two electronic components are interconnected by communication elements and at least one electronic component includes security elements for securing the communication thereof the other electronic component.

Security between electronic components of a portable secured electronic unit

This provides a first device for implementing an RSA-type protected data exchange system for the signing of messages and the verification of the signed messages, and a second device for inhibiting the encryption anti decryption functions inherent of such systems so as to authorize only the signature and signature functions and public key authentication.

Device for implementing a message signature system and chip card

The clock circuit is formed by an oscillator (10-12) which is coupled to a counter/divider circuit (15) provided with read accesses (30). In order to prevent falsification of its data, the circuit is formed as a protected casing and includes a protected access circuit (50) which is connected between said accesses and the counter/divider circuit. Furthermore, a circuit for monitoring the frequency of the oscillator may be provided (100-50).

Device for protecting the validity of time sensitive information

A smart card (1) which includes a random access memory RAM (10) and a read-only memory PROM (7) incorporating a production key (PK), a distributor key (MK), a bearer code (CP) and a serial number (NS) generates a unique number (NU) which is stored in the memory RAM (10) in the card after execution of the following steps of a program which is specific of the card:

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Les Molieres, France

Joseph Hoppe