Patent ID: 8185089

Claim:
A communication system including an access point apparatus connectable to a network and a communication terminal wirelessly communicable to the access point apparatus, wherein: the access point apparatus comprises: a connection information storage location for storing connection information and key information for performing encrypted communication with the communication terminal, the key information being generated using a predetermined generation algorithm from the connection information or from related information for generating the connection information; and transmission programmed logic circuitry configured to transmit the connection information; and the communication terminal comprises: receiving programmed logic circuitry configured to receive the connection information; key information generation programmed logic circuitry configured to generate key information from the connection information using the same generation algorithm as used for generating the key information stored in the connection information storage location; and connection establishing programmed logic circuitry configured to establish a connection for the encrypted communication with the access point apparatus using the key information generated by the key information generation programmed logic circuitry, wherein said key information is generated prior to performing any encrypted communication with the communication terminal, and wherein communication between the communication terminal and the access point apparatus is established and performed without using an authentication server.