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Authentication method and apparatus for a wireless LAN system
| Details |
Inventors: Kokudo, Junichi;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Nguyen; Hanh
Assistant Examiner: Levitan; Dmitry
Attorney, Agent or Firm: Sughrue Mion, PLLC
An authentication method and apparatus at a wireless LAN (local area network) system based on the IEEE 802.11, in which many STAs (terminal stations) are connected to APs (access points), and which can keep the security in authentication, is provided. At the authentication method, an authentication request from one of the STAs composed of a data terminal and a wireless LAN card is transmitted to one of the APs. The AP transmits a MAC (media access control) address of the STA to an authentication server by converting the authentication request to a protocol adaptable to the authentication server. The authentication server checks the MAC address and transmits a challenge message to the AP 2. The AP 2 executes encryption authentication with the STA based on a WEP (wired equivalent privacy) algorithm stipulated in the IEEE 802.11. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide an authentication method and apparatus at a wireless LAN system, which can keep the security.
According to the present invention, for achieving the object mentioned above, there is provided an authentication method at a wireless LAN (local area network) system.
The authentication method provides the steps of; transmitting an authentication request from a STA (terminal station) to an AP (access point), with which the STA desires to make association, requesting authentication of the authentication request from the AP to an authentication server, by converting the authentication request to a protocol adaptable to the authentication server, cheking the authentication request at the authentication server based on a MAC (media access control) address of the STA, executing encryption authentication at the AP with the STA based on a designated encryption algorithm, and notifying an authentication completion from the authentication server to the AP, after the authentication server received a response of a completion of the encryption authentication from the AP.
According to the present invention, after the encryption authentication is normally completed, a table of the MAC address in the AP is renewed by an instruction from the authentication server.
According to the present invention, in case that a trouble occurs at the authentication server, the AP itself executes authentication of the MAC address.
According to the present invention, the encryption algorithm uses a shared key having a predetermined usable period.
According to the present invention, in case that the predetermined usable period of the shared key expired, the MAC address is authenticated by an open system authentication method, and at the open system authentication method, after association, a period of communication is limited to a designated short time, and a key is transported in the limited time by using such an Internet Key Exchange method of Public Key Infrastructure, and the authentication request is executed again by using the shared key
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