WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION METHOD

摘要

A wireless communication device 1 encrypts a passphrase which corresponds to a communication mode after change and which is a character string for authentication by using an encryption key PTK corresponding to a communication mode before change, and transmits the encrypted passphrase to a wireless communication device 2, and also creates an encryption key PTK corresponding to the communication mode after change from the passphrase corresponding to the communication mode after change. The wireless communication device 2 receives the encrypted passphrase transmitted from the wireless communication device 1 and decrypts the encrypted passphrase by using an encryption key PTK corresponding to the communication mode before change, and also creates an encryption key PTK corresponding to the communication mode after change from the decrypted passphrase.

主权项

1. A wireless communication system in which a first wireless communication device and a second wireless communication device carry out wireless communications with each other, wherein
said first wireless communication device includes:
a passphrase transmitter to, when changing a communication mode of said wireless communications, encrypt a passphrase which corresponds to a communication mode after change and which is a character string for authentication by using an encryption key corresponding to a communication mode before change, and to transmit the encrypted passphrase to said second wireless communication device; anda first encryption key creator to create an encryption key corresponding to the communication mode after change from the passphrase corresponding to said communication mode after change,and said second wireless communication device includes:a passphrase receiver to receive the encrypted passphrase transmitted from said passphrase transmitter and to decrypt said encrypted passphrase by using an encryption key corresponding to said communication mode before change; anda second encryption key creator to create an encryption key corresponding to the communication mode after change from the passphrase decrypted by said passphrase receiver,and wherein said first and second wireless communication devices carry out said wireless communications with each other by using the encryption keys created by said first and second encryption key creators.