| 摘要 |
PURPOSE:To attain ciphering communication with high safety by storing a predetermined digital pattern to each station specific to the own station and executing ciphering communication and obtaining a key depending on an output of a random number generating means. CONSTITUTION:The 1st digital pattern determined to each of stations executing ciphering communication and the 2nd digital pattern specific to the own station are stored in a RAM214. When a key change request is received from a terminal station 211, a microprocessor 213 generates a random number R and gives the information of the RAM214 and a random number R to a power remainder circuit 215, which converts the information in the RAM214 depending on the random number R and transmits a key distribution data converting the own station pattern to an opposite station. On the other hand, the circuit 215 converts the key distribution data transmitted from the opposite station based on the data converted from the pattern of the opposite station to obtain a key of the ciphering communication. |
