| 摘要 |
In the cipher processing to be executed between the mobile unit and the radio control unit in the mobile communication system, an identical fixed data is stored beforehand in both the mobile unit and the radio control unit. The transmission side ciphers and transmits the fixed data at the timing prior to the user data transmission. Further, by deciphering the fixed data, and by comparing the deciphered fixed data with the fixed data having been stored beforehand, the reception side discriminates abnormality in the deciphered result. On the reception side, prior to the user data reception, the fixed data is received and deciphered, and in case that the above data does not match the fixed data having been stored beforehand, the deciphering is decided to be in failure, and the connection with the transmission side is released. |
