| 摘要 |
PROBLEM TO BE SOLVED: To provide transmission and reception apparatuses which can realize performing key distribution and encrypted communication, at the same time. SOLUTION: A transmission apparatus overlaps and transmits minute amplitude modulations, based on a random number signal on a multi-level signal generated, based on information data and key information. A receiving apparatus, in addition to data identification, performs, by using 2 thresholds between which an interval sufficiently larger than a modulation amplitude by a random number is provided, 3 kinds of identification for the random number signal: "1", "0", and "identification impossible", sends back to the transmission apparatus the information of bits with which the identification has succeeded, and shares the sent-back bits as a new key. Thus, the common device, including the transmission and reception apparatuses can realize performing the key distribution and the encrypted communication in the simultaneous manner. COPYRIGHT: (C)2007,JPO&INPIT
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