Certification method, communication device and relay device

Details Certification method, communication device and relay device Certification method, communication device and relay device

H - Electricity

04

L

H04L 9/32 (2006.01)

Patent

CA 2398383

Included are Gateway server GWS which clocks the precise present time, and portable phone MS which performs a packet communication through gateway server GWS and IP server W. Portable phone MS acquires the time information from gateway server GWS, at the time of starting communication with IP server W and corrects, on the basis of this time information, the clocking present time of its own portable phone MS so that it is more precise. In addition, portable phone MS decodes a public key certificate (an electronic certificate issued by Certificate Office C for the public key certificate of IP server W) using the public key of Certificate Office C. Then the portable phone MS judges whether it is within the validity period specified in the public key certificate, using the corrected present time of its own portable phone MS.

L'invention concerne un serveur passerelle (GWS) émettant des signaux d'heure actuelle exacte; un téléphone cellulaire (MS) communiquant par paquets à travers le serveur passerelle (GWS); et un serveur IP (W). Lorsqu'il se met en communication avec le serveur IP (W), le téléphone cellulaire (MS) acquiert les informations sur l'heure provenant du serveur passerelle (GWS) et corrige, sur la base de ces informations, l'heure actuelle par lui-même (MS). Le téléphone cellulaire (MS) utilise une clé publique d'une autorité de certification (C) pour décoder la clé d'un certificat de clé publique transmis depuis le serveur IP (W) (clé électronique émise à destination de la clé publique du serveur IP (W) par l'autorité de certification (C)). De cette manière, le téléphone cellulaire (MS) utilise l'heure actuelle corrigée, dont les signaux sont émis par le téléphone cellulaire (MS), pour décider s'il reste ou non dans les limites temporelles fixées dans le certificat de clé publique.

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