Patent ID: 7519184

Claim:
A wireless communication system for encrypting and decrypting communication data with an encryption key in wireless communication, comprising: an access point including: an encryption key memory to store an encryption key list of a plurality of different encryption keys; a change information transmitter to periodically transmit change information by radio, the change information requesting that an encryption key being used for encrypting the communication data should be changed; and an encryption key selector to select the encryption key from the encryption key list under a rule when the change information is transmitted by radio; and a terminal including: a terminal-side encryption key memory to store a terminal-side encryption key list which is the same as the encryption key list; a change information receiver to receive the change information from the access point; and a terminal-side encryption key selector to select the encryption key from the terminal-side encryption key list under a rule which is the same as the rule, in response to the change information.