Patent ID: 8670567
Filing Date: 2014-03-11
Classification: H04L

Abstract:
1. A method of recovering at least one expired decryption key used by a processor for asymmetrical decryption of encrypted data in a terminal, said expired decryption key having been suppressed after generation by a certification authority device and before registration of a current cryptographic encryption key/decryption key, said generated current decryption key being used by the processor for the asymmetrical decryption of other data in the terminal, said method including receiving from the certification authority device said expired decryption key stored by the certification authority and encrypted as a function of the generated current encryption key, decrypting the encrypted expired decryption key as a function of the generated current decryption key, executed at least in part in a cryptographic medium connected to said terminal, to obtain said expired decryption key, said expired decryption key being initially securely stored in an encrypted form using a certificate authority encryption key.