Token authentication system and method

H - Electricity – 04 – L

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H04L 9/32 (2006.01) G06F 21/00 (2006.01) H04L 9/28 (2006.01)

Patent

CA 2556148

A method for calculating a One Time Password. A secret is concatenated with a count, where the secret is uniquely assigned to a token. The secret can be a private key or a shared secret symmetric key. The count is a number that increases monotonically at the token with the number of one-time Passwords generated at the token. The count is also tracked at an authentication server, where it increases monotonically with each calculation of a one-time Password at the authentication server. An OTP can be calculated by hashing a concatenated secret and count. The result can be truncated.

procédé de calcul d'un mot de passe à usage unique. Un secret est concaténé avec un compte, le secret étant spécifiquement attribué à un jeton. Le secret peut être une clé privé ou une clé symétrique secrète partagée. Le compte est un nombre à croissance monotone au niveau du jeton avec le nombre de mots de passe à usage unique générés dans le jeton. De plus, ce compte est suivi par un serveur d'authentification et croît monotonement à chaque calcul d'un mot de passe unique dans le serveur d'authentification. Un mot de passe à usage unique peut également être calculé par hachage d'un secret et d'un compte concaténé. Le résultat peut être tronqué.

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