Patent ID: 7024553

Claim:
An updating system for an encrypted key for a wireless LAN in which a wireless access point is provided on a LAN, said wireless access point being wirelessly connected to a plurality of wireless access terminal devices and in which data is encrypted and transmitted between the wireless access point and the plurality of wireless access terminal devices, said system comprising: a key management server device, LAN-connected to said wireless access point, comprising: a storage unit for holding k encrypted keys used in the encrypted communication between said wireless access point and the plurality of wireless access terminal devices, where k is greater than 1; and an encrypted key generating unit generating said k encrypted keys and storing the generated k encrypted keys in said storage unit; wherein said key management server device controls said encrypted key generating unit to update one of said encrypted keys stored in said storage unit and delivers the updated encrypted key to said wireless access point and to said plurality of wireless access terminal devices; wherein each one of said wireless access point and said plurality of wireless access terminal devices decrypts wireless communications using said updated encrypted key.