| 摘要 |
PROBLEM TO BE SOLVED: To reduce a time required for mutual authentication in a system in which mutual authentication is required among a plurality of devices. SOLUTION: A host device or a client device to be mutually authenticated is provided with a means for determining whether or not a session key held by each of them required in simple mutual authentication processing in which only a short a time is required for mutual authentication is valid for the other device which is trying to perform mutual authentication processing; and a means for transferring information required for achieving the means. The host device performs high speed simple mutual authentication processing when determined that the session key is valid, and perform normal mutual authentication processing in the other case. A client device performs simple mutual authentication processing when determined that the session key is valid, and replies an abnormal end to the host device without performing any simple mutual authentication processing in the other case. Thus, it is possible to more reduce the mean value of a time required for establishing the authentication state than a device in which this invention is not implemented. COPYRIGHT: (C)2009,JPO&INPIT |
