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1. (WO2005067200) AUTHENTICATION DEVICE, DEVICE TO BE AUTHENTICATED, AND KEY UPDATE METHOD

Pub. No.:    WO/2005/067200    International Application No.:    PCT/JP2004/005879
Publication Date: Fri Jul 22 01:59:59 CEST 2005 International Filing Date: Sat Apr 24 01:59:59 CEST 2004
IPC: H04L 9/14
H04L 9/32
Applicants: MITSUBISHI DENKI KABUSHIKI KAISHA
三菱電機株式会社
OHKOSHI, Takehiro
大越 丈弘
YAMADA, Keiki
山田 敬喜
MAKITA, Satoru
牧田 覚
Inventors: OHKOSHI, Takehiro
大越 丈弘
YAMADA, Keiki
山田 敬喜
MAKITA, Satoru
牧田 覚
Title: AUTHENTICATION DEVICE, DEVICE TO BE AUTHENTICATED, AND KEY UPDATE METHOD
Abstract:
An authentication device (100) includes: an authentication processing section (197) for performing authentication of a communication device (200) by using an authentication key; and an update key generation key section (160)for generating a new authentication key when the communication device (200) does not have an authentication key to be used for the authentication processing by the authentication processing section (197) and generating a new authentication key for updating the authentication key when the communication device (200) has an authentication key but authentication of the communication device (200) by the authentication processing section (197) has failed. By using the new authentication key generated by the update key generation section (160), the authentication processing section (197) again performs authentication of the communication device (200).