Huaximiri

Abstract

Abstract PURPOSE:To reduce the cost of an expansion board type FAX adaptor by imbedding a signature of a sender and a transmission document into a picture data and applying scramble processing to a coded picture data. CONSTITUTION:A signature sentence is imbedded to part of a document picture data by microprocessor processing. In this case, a signature ciphering key K0 and a signature sentence Ns are inputted together with a transmission document M to generate a scramble key K1 thereby setting the mode to the ciphering process. A picture data coded by using the key K1 is sent while being transposition ciphering as two binary data subjected to block processing in the unit of power. A receiver side receives a key K0 in common to a sender and a receiver and the transmission document is confirmed based on the adequacy of the signature sentence Ns. When the adequacy is confirmed, the key K1 is used to set the decoding process. When not adequate, it is aborted. Thus, since only the sender and the receiver cipher and manage the key K0, a 3rd party cannot detect the key.

Inventors

• 👤 Kineo Matsui
• 👤 甲子雄 松井
• 👤 Yasuhiro Nakamura
• 👤 康弘 中村
• 👤 Kiyoshi Tanaka
• 👤 清 田中

Bibliographic Details