Patent ID: 8046583
Filing Date: 2011-10-25
Classification: H04L,H04W

Abstract:
1. A wireless terminal which executes authentication processing between the wireless terminal itself and an authentication device when forming a wireless connection with a base station, and which shares, with the authentication device, a connection key for creating an encryption key that is used in wireless communications with a base station, comprising: a storage portion to store a session key, which is created in authentication processing executed between the wireless terminal and the authentication device when the wireless terminal logs on to a first base station, and which is shared with the authentication device; a creation portion that creates, from the session key which is stored in the storage portion, when the connection destination is switched from the first base station to a second base station, a new connection key for creating an encryption key that is used in wireless communications with the second base station; a unit to notify the authentication device of the new connection key via the second base station; a unit to receive, from the second base station, when the new connection key is judged to be valid by the authentication device through validity judging processing with the use of the session key, an encryption key that is used in wireless communications between the wireless terminal and the second base station, the received encryption key being created from the new connection key, which is notified from the authentication device to the second base station, and being encrypted with the new connection key; and a unit to decrypt the encrypted encryption key with the new connection key and executing wireless communications with the second base station using the encryption key.