Secret key exchange

H - Electricity – 04 – L

Patent

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Details

H04L 9/14 (2006.01) H04L 9/08 (2006.01) H04L 9/28 (2006.01)

Patent

CA 2169449

The present invention describes a method for enabling users of a cryptosystem to agree on secret keys. In one embodiment, a trusted agent chooses at least one individual key for each user, with at least a portion of such individual key being secret. At least some of the individual keys are then stored in physically secure devices, and the pair of users i and j use their individual keys to compute a common secret key. In another embodiment, each trustee of a group of trustees chooses at least one individual key for each user, with at least some portion of such individual key being secret. The keys chosen by a sufficiently small number of such trustees, however, are insufficient for computing the common secret key of the users. Other hardware and software key exchange protocols based on these two techniques are also disclosed.

L'invention porte sur un procédé permettant aux usagers d'un cryptosystème de se mettre d'accord sur des codes secrets. Dans l'une des réalisations, un homme de confiance choisit un code pour chacun des usagers, dont au moins une partie est tenue secrète. Au moins certains de ces codes individuels sont déposés dans des dispositifs protégés. Les usagers i and j utilisent alors leurs codes respectifs pour calculer un code secret commun. Dans une autre réalisation, chacun des membres d'un groupe d'hommes de confiance choisit au moins un code pour chacun des usagers dont au moins une partie est tenue secrète. Néanmoins, les codes choisis par un nombre suffisamment fiable de ces hommes de confiance sont insuffisants pour calculer le code secret commun des usagers. Sont également exposés d'autres protocoles d'échange de codes basés sur ces deux techniques aussi bien au niveau du matériel que des logiciels.

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