METHOD FOR IMPLEMENTING A PRIVATE KEY COMMUNICATION PROTOCOL BETWEEN TWO PROCESSING DEVICES

摘要

A method for implementing private key protocols between two processing devices of which at least one is a portable storage medium. The devices are fitted with a digital processing circuit for performing modular calculation operations with a view to executing operations such as modular multiplication, the processing circuit is used to implement a private key encryption function consisting of a series of reversible operations comprising at least a combination of two operations, i.e. a modular calculation operation and a binary logic operation, and said function is applied either for encrypting or signing messages to be transmitted, or for decrypting received messages.