| 摘要 |
PURPOSE:To secure the certification between counter cipher devices of an open key delivery system by ciphering and delivering open keys to each other to obtain the open keys through decoding of each cipher device, and producing a basic key from those open keys. CONSTITUTION:An open key is ciphered by a cipher key and sent from the remote side. This ciphered open key is supplied to a data ciphering standard arithmetic part 22 via an input register 20. In such a case, a cipher key K is delivered from a key generator 13 via a key register 21. Thus the part 22 performs decoding with the key K to obtain an open key. This open key is selected by a selector 24 via an output register 23 and supplied to the generator 13. A cipher sentence coded by a station of the remote side is supplied to the part 22 via the register 20, and decoded to an original normal sentence by the key K. |
