Digital radio transceiver with encrypted key storage

H - Electricity – 04 – L

Patent

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Details

H04L 9/14 (2006.01) H04L 9/08 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2161639

A digital radio has standardized "key" storage for several different cryptosystems. Cryptographic keys are stored in a table in non-volatile memory such as EEPROM. The "keys" are stored in an "encrypted" form such that their identities are not readily revealed by a "dump" of memory contents. Additional security is provided in accordance with the present invention by extracting the "keys" from the stored table and re-"encrypting" the entire table each time a key loader device is attached to the radio. Multiple key banks are used to provide enhanced voice security by increasing the number of encryption keys available for use by a radio.

Un appareil radioélectrique numérique a une mémorisation "à clé" normalisée pour plusieurs systèmes de cryptage différents (DES, VGE, VGS, etc.). Les clés cryptographiques sont mémorisées dans un tableau d'une mémoire non volatile, par exemple EEPROM. Les "clés" sont mémorisées sous forme "cryptée" de sorte qu'il n'est pas facile d'en découvrir l'identité par "vidage" du contenu de mémoire. La présente invention offre une sécurité supplémentaire en prévoyant l'extraction des "clés" du tableau mémorisé et le re"cryptage" de tout le tableau chaque fois qu'un dispositif chargeur à clé est fixé à l'appareil radioélectrique. De multiples banques de clés sont utilisées pour assurer une meilleure sécurité vocale par accroissement du nombre de clés de cryptage disponibles par appareil.

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