SECURE COMMUNICATION EQUIPMENT AND SECURE TRANSMISSION SYSTEM

摘要

In a secure transmission system in which first and second pieces of communication equipment (100A 100B) are interconnected via a transmission line (10L), the first communication equipment has a conversion part (17A) for encrypting an information signal (A) to be transmitted, through utilization of a received signal (B) and the second communication equipment has an information memory (23B) for storing, as a key information, information to be transmitted to the first communication equipment and an inverse conversion part (18B) in which the encrypted signal received from the first communication equipment is decoded using the key information read out of the information memory. Secure communication equipment has a conversion part for encrypting a transmission information signal through utilization of a received signal, an information memory for storing, as key information, the information signal to be transmitted and an inverse conversion part for decoding the received signal through utilization of 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.