Method and devices for secure measurements of time-based...

Details Method and devices for secure measurements of time-based... Method and devices for secure measurements of time-based...

H - Electricity

04

L

H04L 29/06 (2006.01) H04L 9/32 (2006.01) H04L 12/24 (2006.01)

Patent

CA 2612735

In order to provide a secure measurement of Round Trip Time (RTT), the calculation of RTT and the authentication data are separated. A device A (212) sends a message (222) to device B (216) to start the method. Both devices generate (224; 226) a random number (Random_A, Random_B) and device A waits (228) for device B to finish. Device A sends (242) its random number to B, which answers (246) with its own random number, and device A calculates (250) the RTT. If the RTT is below a certain limit, device A then requires (252) authentication data, which is calculated (262) by device B and sent (264) to device A that verifies (266) the authentication data. The RTT can thus be securely calculated regardless of the calculating resources of device B. Alternate embodiments, a system and devices are also provided.

Selon l'invention, pour obtenir une mesure fiable d'un temps d'aller-retour (RTT), le calcul du RTT et les données d'authentification sont séparés. Un dispositif A (212) envoie un message (222) à un dispositif B (216) pour commencer le procédé. Les deux dispositifs génèrent (224, 226) un nombre aléatoire (Random_A, Random_B) et le dispositif A attend (228) que le dispositif B finisse. Le dispositif A envoie (242) son nombre aléatoire au dispositif B, lequel répond (246) avec son propre nombre aléatoire, et le dispositif A calcule (250) le RTT. Si le RTT est inférieur à une certaine limite, le dispositif A exige (252) des données d'authentification, qui sont calculées (262) par le dispositif B et envoyées (264) au dispositif A, lequel vérifie (266) ces données d'authentification. Le RTT peut ainsi être calculé de manière fiable indépendamment des ressources de calcul du dispositif B. Dans d'autres modes de réalisation, l'invention concerne également un système et des dispositifs.

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