Method for establishing secure communications and associated...

H - Electricity – 04 – L

Patent

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H04L 9/30 (2006.01) H04L 9/08 (2006.01)

Patent

CA 2200624

The method for establishing secure communications between users (A, B and C) using a public key encryption/decryption system involves the following steps. Centre C generates a pair of keys, one of which is a public key. User A generates a pair of keys, one of which is a public key (Pa), but User A's public key is encrypted with Centre C's public key (Pcks). User A transmits to Centre C his public key (Pa) encrypted with Centre C's public key (Pcks). Centre C decrypts User A's public key and, if User A is certified by Centre C, transmits back to User A his public key (Pa) encrypted with Centre C's key. This method allows for centralized control over users' public keys.

La méthode pour établir communications sécurisées entre des utilisateurs (A,B,C) à l'aide d'un système de chiffrement/déchiffrement à clé publique comprend les étapes suivantes. Un centre (C) génère une paire de clés incluant une clé publique. Un utilisateur (A) génère une paire de clés incluant une clé publique (Pa) mais sa propre clé publique est chiffrée avec la clé publique (Pcks) du centre. L'utilisateur (A) transmet au centre (C) sa clé publique (Pa) chiffrée avec la clé publique (Pcks) du centre. Le centre (C) déchiffre la clé publique de l'utilisateur et si cet utilisateur est agréé par le centre, le centre lui retransmet sa propre clé publique (Pa) chiffrée avec elle-même. Cette méthode permet d'obtenir un contrôle centralisé des clés publiques des utilisateurs.

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