| 摘要 |
PURPOSE:To increase the number of keys to a secret by making the secret by scrambling the polarity of transmitted information, by adding a certain bais to its absolute value, and by multiplying the scrambled signal by it, and then by performing reverse conversion on a reception side. CONSTITUTION:The comparator 101 of a separating circuit 100 discriminates the polarity of an input signal to output a polarity signal, and the input signal and polarity signal are multiplied by a multiplier 102 to output an absolute value signal. Then, the polarity signal is scrambled by the shift register 201 and exclusive OR circuits 202 and 203 of a scrambling circuit 200. Then, the adder 302 of a synthesizing circuit 300 adds a DC voltage to the absolute value signal and its output and the scrambled polarity signal by a multiplier 303 to keep a secret, thereby performing transmission from a terminal 2. Then, the received signal is converted reversely by a separating circuit 400, a descrambling circuit 500, and a synthesizing circuit 600. |
