| 摘要 |
The terminal (T) includes a register having two parts (A1, B1, and A2, B2) for writing a personal identity word consisting of a first and a second part, and transmission means for sending the first part of the identity word to the central station. The station has a memory (DM) containing both the first and second parts of all personal identity words used, and furthermore the secret information which is to be sent. On reception of the first part of the identity word, the second part associated with it is fed from the data memory (DM) to an enciphering device (KRC) together with the secret information for enciphering it and sending the enciphered information to the terminal. The terminal contains a deciphering device (KRT) which, sumultaneously with obtaining the enciphered information from the central station, obtains the second part of the personal identity word from the register of the terminal itself so that the message can be deciphered. |
