Encryption communication apparatus

H - Electricity – 04 – L

Patent

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Details

H04L 9/14 (2006.01) H04L 9/00 (2006.01) H04L 9/10 (2006.01)

Patent

CA 2432269

This invention relates to an encryption communication apparatus using encryption processing. It is an object of this invention to obtain the encryption communication apparatus with excellent tamper-resistance while ensuring sufficient securities. A communicating unit 1 sends and receives communication data including a length field and a data field. A length comparing unit 6 compares a value of the length field and a minimum length value stored in the apparatus in advance. When it is judged that the value of the length field is less than the minimum length value, a controlling unit 7 controls an encryption processing unit not to perform encryption processing or decryption processing of the data in the data field.

Appareil de communication chiffrée inviolable utilisant le chiffrage et assurant une sécurité suffisante. Une unité de communication (1) transmet et reçoit des données de communication comportant un champ de longueur et un champ de données. Une unité de comparaison de longueur (6) compare la valeur du champ de longueur et la valeur de longueur minimale, stockée en avance dans l'appareil. Lorsqu'on détecte que le champ de longueur est inférieur à la longueur de valeur minimale, une unité de commande (7) commande une unité de chiffrage (5) de manière à lui interdire le chiffrage ou le décodage des données dans le champ de données.

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