ISDN CIPHER ADAPTER AND ISDN CIPHER COMMUNICATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide cipher communication by connecting an ISDN cipher adapter for communication utilizing an ISDN network. SOLUTION: The ISDN cipher adapter is connected between the network and a terminal. The ISDN cipher adapter recognizes and fixes an original frame in a frame processing part. Afterwards, data are synchronized to the network and the ISDN cipher adapter enciphers data received from the ISDN terminal in an enciphering part and deciphers data received from the network so that cipher communication can be provided.