Cryptographic communication equipment

Abstract

Abstract PURPOSE:To attain the highly reliable management of a cryptographic text to be secured by decoding a cryptographic text reproduced from a cryptographic file into a plain text by means of a key data logic circuit provided to a cryptographic communication processing IC card attached/detached to/from a data input/output device. CONSTITUTION:A cryptographic text data received based on a command of the operator is not decoded but stored as it is in a cryptographic text file 55. In extracting the cryptographic text from the cryptographic text file 55, a cryptographic text communication processing IC card 37 having a key data logic circuit 22 is connected to the data input/output device 38 to allow the key data logic circuit 22 to decode the cryptographic text data into a plain text and to reproduce it thereby preventing surely interception of the cryptographic text by the operator having no communication processing IC card 37. Thus, the reliability of the substantial cryptographic communication is secured.

Inventors

• 👤 Hiroshi Matsunaga
• 👤 宏 松永

Bibliographic Details