Multi-step digital signature method and system

H - Electricity – 04 – L

Patent

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H04L 9/08 (2006.01) G06Q 20/00 (2006.01) H04L 9/14 (2006.01) H04L 9/32 (2006.01) G06F 7/72 (2006.01)

Patent

CA 2223305

A multi-step signing system and method uses multiple signing devices (11, 13, 15, 17, 19) to affix a single signature which can be verified using a single public verification key. Each signing device possesses a share of the signature key and affixes a partial signature in response to authorization from a plurality of authorizing agents (23, 25, 27, 29, 31). In a serial embodiment, after a first partial signature has been affixed, a second signing device exponentiates the first partial signature. In a parallel embodiment, each signing device affixes a partial signature, and the plurality of partial signatures are multiplied together to form the final signature. Security of the system is enhanced by distributing capability to affix signatures among a plurality of signing devices and by distributing authority to affix a partial signature among a plurality of authorizing agents.

Cette invention concerne un système et un procédé de signature à étapes multiples faisant appel à plusieurs dispositifs de signature (11, 13, 15, 17, 19) permettant d'apposer une signature unique qui peut être vérifiée à l'aide d'une seule clé de vérification publique. Chaque dispositif de signature comprend une part de la clé de signature et appose une signature partielle en réponse à une autorisation reçue de plusieurs agents d'autorisation (23, 25, 27, 29, 31). Dans un mode de réalisation en série, après l'apposition d'une première signature partielle, un second dispositif de signature va élever à la puissance la première signature partielle. Dans un mode de réalisation parallèle, chaque dispositif de signature appose une signature partielle, toutes ces signatures partielles étant ensuite multipliées entre elles afin de former la signature finale. La meilleure sécurité de se système tient à la répartition des capacités d'apposition de signature entre plusieurs dispositifs de signature, ainsi qu'à la répartition des autorisations d'apposition d'une signature partielle entre plusieurs agents d'autorisation.

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