Method for conveying secret keys to security modules and user cards in a data-processing network.

ABSTRACT A method for routing the secret keys to the modulesde security and user cards, in a network detraitement information. Inventors: Michel HAZARD - Jean-Michel DESJARDINS -François PATH The present invention relates to a method for acheminerau least one predetermined secret key in order unsecure operating a service, characterized in that it involves transmitting a Cled predetermined operating in encrypted form, safety SomeModule (MSC1) having a predetermined niveauhiérarchique to a security module (U MST1ou map) sublevel to niveauprédéterminé, this encryption of using encryption and unalgorithme involving Cled ' predetermined operation and at least one clédiversifiée, this diversified key necessary auchiffrement is obtained by a dediversification algorithm involving a base key decette diversified key, as well as information from the dediversification hiérarchiqueinférieur level module, the encrypted predetermined key of exploitationétant decrypted by implementing, in the lower hierarchical deniveau module to the predetermined level, unalgorithme decryption, the inverse of the deciphering algorithm. Figure 1.