Patent ID: 7876897

Claim:
An apparatus for data security in a wireless network system, comprising: a controller to generate a frame comprising an initialization vector upon receiving a request to transmit the frame to the wireless network, the controller modifying the initialization vector according to modification information, and the controller generating a next frame comprising the modified initialization vector upon receiving a request to transmit the next frame to the wireless network; an encryptor to encrypt the next frame with a non-modified initialization vector and encryption/decryption key information according to an encryption algorithm, the non-modified initialization vector being the initialization vector prior to the modification by the controller; a transmitter to transmit the encrypted frame to the wireless network; a storage unit to store the encryption/decryption key information, initialization vector information, and the modification information; and a decryptor to decrypt a frame received from the wireless network with the encryption/decryption key information, to determine whether the initialization vector information is provided in the decrypted frame, and when the initialization vector information is provided in the decrypted frame, to store the initialization vector information provided in the decrypted frame in the storage unit.