| 摘要 |
PURPOSE: An average ambiguous calculation method of a wire-tapper, a security message transmission method, and a system thereof are provided to reduce calculation amount in the calculation of average ambiguous states. CONSTITUTION: A first encoder(410) executes a security encoding of a security message from a transmitter in order to prevent wiretap through a binary erasure channel. A second encoder(420) encodes a channel in the output of the first encoder for preventing wiretap through a white Gauss noise channel. A first decoder(450) decodes a channel of a codes transmitted through a main channel. A second decoder(460) restores the security message by encoding the output of the first decoder. |
