Technique for split knowledge backup and recovery of a...

H - Electricity – 04 – L

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H04L 9/00 (2006.01) H04K 1/00 (2006.01) H04L 9/08 (2006.01)

Patent

CA 2374968

In a secure cryptographic environment, a private key in a private/public key cryptographic scheme needs to be backed up and recovered in case of a loss or corruption of the private key. To back up the private key, multiple key segments are generated based on the private key which are distributed to a corresponding number of trusted individuals, each of whom has knowledge of only his or her key segment. The key can be restored (629) only when all of the trusted individuals provide the respective key segments, based on which the original private key is reconstructed (629). In addition, each trusted individual is uniquely identifiable by a personal identification number. Advantageously, the private key, which is secret, can be backed up and restored (629) without any individual having knowledge of the full key.

Dans un environnement de chiffrement protégé, un double d'une clé privée d'un mécanisme de chiffrement par clé privée/publique doit être effectué et récupéré en cas de perte ou d'altération de la clé privée. Pour faire le double de la clé privée, des segments de clé multiples sont générés sur la base de la clé privée et son distribués à un nombre correspondant de personnes de confiance ne connaissant que le segment de clé en leur possession. Le clé ne peut être rétablie (629) que lorsque toutes les personnes de confiance produisent les segments de clé respectifs, selon la clé privée d'origine à reconstituer (629). Par ailleurs, chaque personne de confiance est identifiable de manière unique par un numéro d'identification personnel. Pour un meilleur résultat, la clé privée, qui est secrète, peut être copiée et reconstituée (629) sans que la personne connaisse la clé dans son intégralité.

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