Patent ID: 7539866

Claim:
A system comprising: a wireless LAN terminal coupled to an access point device, the wireless LAN terminal and access point device operate to exchange a key descriptor, the key descriptor having a structure comprising: a key initial vector which is a random number generated in the access point device; a key descriptor type which indicates an encryption algorithm; and a plurality of key materials encrypted according to the encryption algorithm of the key descriptor using the key initial vector and a master session key shared between the wireless LAN terminal and the access point device, a first encrypted key material to enable formation of a first encryption key, wherein a second wireless session encryption key that is formed by the wireless LAN terminal from a second encrypted material of the plurality of encrypted key materials after the first encrypted key material operates as a new encryption key that is different from the first encryption key for re-keying wireless LAN terminal encryption, and wherein each of the key materials comprises: a tag part which designates a wireless section encryption algorithm; a length part which designates the length of a wireless section encryption key; and a key value part which represents the wireless section encryption key.