Protectedly reading out an enciphered, cryptographic key

G - Physics – 07 – F

Patent

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G07F 7/10 (2006.01)

Patent

CA 2309435

Method and apparatus for protectedly reading out an enciphered, cryptographic key (Ksec) stored in a first memory (2) of a first communication apparatus (8; 8'), comprising the following steps: a) making available a first predetermined number (PW; X) by the first communication apparatus (8; 8'); b) receiving the first predetermined number (PW; X) by the second communication apparatus; c) calculating a Message Authentication Code (MAC) by the second communication apparatus on a second predetermined number, using the first predetermined number (PW; X), and with the aid of a predetermined key (Kicc); d) making available the Message Authentication Code by the second communication apparatus (6; 13); e) deciphering the cryptographic key by the first communication apparatus (8; 8'), using the Message Authentication Code as a deciphering key.

On décrit un procédé et un appareil de lecture sécurisée d'une clé de chiffrement cryptée (K¿sec?) stockée dans une première mémoire (2) d'un premier appareil de communication (8, 8'). Le procédé se réalise comme suit: a) le premier appareil de communication (8, 8') produit un premier numéro prédéterminé (PW, X); b) le deuxième appareil de communication reçoit le premier numéro prédéterminé (PW, X); c) le deuxième appareil de communication utilise ce premier numéro prédéterminé et une clé prédéterminée (K¿icc?) pour calculer un code d'authentification de message (MAC) sur la base d'un deuxième numéro prédéterminé; d) le deuxième appareil de communication (6, 13) produit le code d'authentification de message; e) le premier appareil de communication (8, 8') déchiffre la clé de chiffrement en utilisant le code d'authentification de message comme clé de déchiffrement.

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