Cryptosystem

H - Electricity – 04 – L

Patent

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Details

H04L 9/28 (2006.01) H04L 9/08 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2194421

In a cryptosystem, communication terminals and encryptors can be grouped physically and logically. The communication mode can be switched by the encryptor between ciphertext communication and plaintext communication. The encryptor includes the session key memorizing unit for memorizing the session key and the mode switch for switching the communication mode between ciphertext communication and plaintext communication. The key manager distributes the session key generated by the session key generating unit and the valid/invalid information set by the valid/invalid setting unit to each encryptor. The valid/invalid judging unit judges whether the communication data should be sent in ciphertext or plaintext using the mode switch and the valid/invalid . information.

Dans un système cryptographique, les terminaux de communication et les machines à chiffrer peuvent être groupés physiquement et logiquement. Le mode de communication peut être commuté entre les communications chiffrées et les communications non chiffrées par la machine à chiffrer. Celle-ci comprend l'unité de mémorisation des clés de séance et le commutateur de modes de communication. Le gestionnaire de clés distribue aux machines à chiffrer les clés produites par l'unité de génération de clés de séance et l'information valide/invalide produite par l'unité d'établissement de validation/invalidation. L'unité d'évalulation détermine si les données à transmettre doivent être chiffrées ou non en utilisant le commutateur de mode et l'information valide/invalide.

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