METHOD FOR MANAGING CIPHERING KEYS FOR A SYMMETRIC CRYPTOGRAPHY SYSTEM AND DEVICE GENERATING THE CIPHERING KEYS POUR IMPLEMENTING THE METHOD

摘要

The present invention relates to a method for the management of ciphering keys for a symmetric crypography system comprising the following steps: the initial communication, through an authority common to entities susceptible of exchanging ciphered information, of a private key Fi(arg) = F(cs;UTILi; arg) comprised of a bijective function, parametered specifically for each of the addressees UTILi, and, at the time when each of the ciphered transactions is performed, by the data user sender: a) constructing a key CLEi = Fi(UTILj; VAR); b) by the data user addressee: b) calculating the key CLEj = Fj(UTILi; VAR). It also relates to a device for implementing said method.