| 摘要 |
PROBLEM TO BE SOLVED: To provide high security by preventing eavesdropping, an unauthorized use of an access point (AP), and impersonation of the AP in a wireless LAN system. SOLUTION: Key information upon previous communication is recorded in an AP 101 and a terminal device (STA) 103 to be used as authentication information upon new communication. For example, the STA 103 reads the previous key information recorded upon new communication negotiation to be transmitted to the AP 101. The AP 101 authenticates the STA 103 based on the key information received and the key information recorded in its own device. Also, a PMK generation function is provided to the STA 103, so that different PMK is used per communication. Furthermore, a pair of asymmetric keys of a public key cryptosystem is set to the AP 101 and the STA 103, and the public key cryptosystem is used upon transmission and reception of the PMK and the authentication information (including previous key information) between both of the AP 101 and the STA 103, so that eavesdropping and impersonation are prevented. COPYRIGHT: (C)2008,JPO&INPIT |
