Method of limiting key usage in a postage metering system...

Details Method of limiting key usage in a postage metering system... Method of limiting key usage in a postage metering system...

H - Electricity

04

L

H04L 9/28 (2006.01) B41L 47/58 (2006.01) G07B 17/00 (2006.01) G07B 17/02 (2006.01)

Patent

CA 2293119

A method for requiring that a key used in a cryptographic apparatus be changed includes the steps of: storing a constraint value for a non-time parameter of the cryptographic apparatus, the non-time parameter being related to the operation of the cryptographic apparatus; and requiring the key to be changed when an actual value of the non-time parameter is not within a range defined by the constraint value.

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