Patent ID: 7912224

Claim:
A key management device of a wireless network including an access point, the key management device comprising: a public key and a secret key of the key management device; a limited communication unit that receives encryption information from a wireless network device logging onto the wireless network; and a key creating unit that creates an encryption key based on the encryption information received by the limited communication unit, the encryption key being used by the wireless network device in wireless communication in the wireless network, wherein the wireless network device transmits, to the key management device, the encryption information and a hash value of messages transmitted to and received from the access point, wherein the key creating unit encrypts the encryption key by using a public key of the access point included in the encryption information and electronically signs the hash value by using the secret key, wherein the limited communication unit transmits, to the wireless network device, the encryption key encrypted by the key creating unit, the electronically signed hash value, and the public key of the key management device, wherein the wireless network device transmits, to the access point, the encryption key transmitted by the key management device, the electronically signed hash value, and the public key of the key management device, wherein the access point decrypts the encryption key transmitted by the wireless network device and authenticates the hash value, and wherein the wireless network device is allowed to log onto the wireless network according to authentication results of the access point.