CIPHER COMMUNICATION METHOD AND SYSTEM EQUIPMENT

• Main Authors: KAWAKUBO HIDEJI, TAKADA SHUNSUKE
• Format: Patent
• Language: English
• Published: 09.10.1998
• Edition: 6
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

PROBLEM TO BE SOLVED: To perform the cipher communication of high safety by packaging and loading a secrecy protected ciphering/deciphering device to a computer card incorporated in a communication controller for connecting an information terminal equipment to a communication path and performing ciphering/ deciphering processings together for the transfer of the input/output of secret data between the information terminal equipment and the communication path. SOLUTION: Through the terminal and communication input/output parts 11 and 14 and communication control part 13 of a cipher communication equipment 9 packaged to the computer card 10 and by the control, the information terminal equipments are connected by the communication path 8. A random number generation part 12 generates a random number and generates a cipher key, a storage part 15 stores the secret key and program of a transmission side for ciphering/deciphering and the storage part 19 stores the public key of a reception opposite side. A ciphering/deciphering part 16 executes the processing of ciphering/deciphering by using the cipher key and the public key by the control of a control part 17 and the ciphering/deciphering device 18 physically protects the secrecy of the respective parts inside. Thus, without uselessly consuming hardware resources, safe communication is made possible.