PSEUDO-RANDOM GENERATOR BASED ON A HASH CODING FUNCTION FOR CRYPTOGRAPHIC SYSTEMS REQUIRING RANDOM DRAWING

摘要

The invention concerns a cryptographic system, normally requiring the drawing of a random number k, which is a whole number. The system is characterised in that it is operated by replacing said random number k by the value h (m/secret) in which h is a hash coding function, m is the message intervening in said system and 'secret' is a secret unknown to the world outside the cryptographic system. The invention is particularly applicable to communicating media such as smart cards, PCMCIA cards, badges, contactless cards or any other portable medium.