Nippon Telegraph and Telephone Corporation

Fumio Mano

Kenji Okada

Noriki Miki

Kiyomi Kumozaki

Nobuyuki Tokura

In a secure transmission system in which first and second pieces of communication equipment are interconnected via a transmission line, the first communication equipment has a conversion part for encrypting an information signal to be transmitted, through utilization of a received signal and the second communication equipment has an information memory for storing, as a key information, information to be transmitted to the first communication equipment and an inverse conversion part in which the encrypted signal received from the first communication equipment is decoded using the key information read out of the information memory. As the transmission information signal varies, the key information also varies accordingly. Hence, a highly secure transmission system and secure communication equipment can be realized.

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Kanagawa, Japan

Fumio Mano