Postage security device having cryptographic keys with a...

G - Physics – 07 – B

Patent

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G07B 17/00 (2006.01) H04L 9/14 (2006.01) H04L 9/32 (2006.01)

Patent

CA 2441407

A cryptographic method for providing a level of security by a postage security device (60), which generates a digital token (62) using a cryptographic key (64). When it is required to make a key change in order to improve the level of security, the postage security device (60) replaces the cryptographic key (64) with a new cryptographic key, wherein the new cryptographic key has a key length that is equal to or greater than the replaced cryptographic key. The new cryptographic key can be generated by the postage security device (60) based on a given key length, or selected from a plurality of replacement keys stored in a storage device (54).

L'invention concerne un procédé cryptographique permettant d'obtenir un certain degré de sécurité à l'aide d'un dispositif de sécurité d'affranchissement, lequel produit un jeton numérique à l'aide d'une clé cryptographique. Lorsque pour améliorer le niveau de sécurité il est nécessaire d'effectuer un changement de clé, le dispositif de sécurité d'affranchissement remplace la clé cryptographique par une nouvelle clé cryptographique, cette nouvelle clé cryptographique possédant une longueur de clé supérieure ou égale à celle de la clé cryptographique remplacée. Cette nouvelle clé cryptographique peut être produite par le dispositif de sécurité d'affranchissement en fonction d'une longueur de clé donnée, ou peut être choisie parmi plusieurs clés de remplacement stockées dans un dispositif de stockage.

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