Method of extending the validity of a cryptographic certificate

Details Method of extending the validity of a cryptographic certificate Method of extending the validity of a cryptographic certificate

H - Electricity

04

L

H04L 9/00 (2006.01) H04L 9/32 (2006.01)

Patent

CA 2151590

A cryptographic certificate attesting to the authenticity of the original document elements will lose its validity when the cryptographic function underlying the certifying scheme is compromised. The present invention extends the reliability of such a certificate by subjecting the combination of the original certificate and the digital representation of the document to a scheme based on a less vulnerable function using the steps of: obtaining the original document (11); applying the function to the document to create the original certificate (13); combining the original document and the certificate (15); and, applying another function to the combination to create an extended certificate (17).

Une attestation cryptographique servant à garantir l'authenticité des éléments d'un document original perd de sa validité lorsque la fonction cryptographique sous-jacente au code d'attestation a été compromise. Cette invention augmente la fiabilité d'une telle attestation en soumettant l'association de l'attestation originale et la représentation numérique du document à un code d'attestation fondé sur une fonction de moindre vulnérabilité comportant les étapes suivantes : obtenir le document original (11); appliquer la fonction à ce document pour créer l'attestation originale (13); associer document original et attestation (15); et appliquer une autre fonction à cette association du document et de l'attestation pour produire une attestation étendue (17).

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