| 摘要 |
PURPOSE:To secure the certification performance between circuit cipher device DCP of each terminal side by giving addresses to these devices DCP and giving the conditions of address coincidence for decoding of open keys given from the DCP of the host side. CONSTITUTION:Proper addresses A0-An, B0-Bn and C0-Cn are given to DCP61-63 at the terminal device respectively. The input data of the terminal side is ciphered at a DCP2 of the host side by means of a secret key K0 for certification. An address is set at the DCP61 through a key pad. When the coincidence is obtained between said address and the address of the input data, an open key is decoded as the input data and used as the key data for operation of a data ciphering standard DES. Then said open key is decoded through prescribed times of DES operations. |
