High-Security Communication System, and Transmitter and Receiver Both Used Therein

A receiver that receives a random number sequence, comprising:

• a detector that detects the random number sequence;
• and
• a decoder that decodes the detected random number sequence,
• wherein the detector receives the encoded random number sequence, and the decoder uses a common key shared in advance between the receiver and a transmitter that transmits signals received by the receiver, and divides the random number sequence into two or more of random number series using the common key, where each bit value of the common key is fixedly connected with each slot of the random number sequence, and
• each of the random number series is decoded independently.

A communication system, comprising:

• a transmitter that transmits a random number sequence;
• a receiver that receives the random number sequence;
• and
• a transmission channel through which the random number sequence is transmitted between the transmitter and the receiver,
• wherein the transmitter includes an encoder that encodes the random number sequence,
• the encoder uses a common key shared in advance between the transmitter and the receiver that receives signals transmitted from the transmitter, divides the random number sequence into two or more of random number series using the common key, where each bit value of the common key is fixedly connected with each slot of the random number sequence, and encodes each of the divided random number series independently,
• the receiver includes a detector that detects the random number sequence and a decoder that decodes the detected random number sequence,
• the detector receives the encoded random number sequence, and the decoder uses the common key shared in advance between the receiver and the transmitter that transmits signals received by the receiver, and divides the random number sequence into two or more of random number series using the common key, where each bit value of the common key is connected with each slot of the random number sequence based on the predetermined correspondence relation, and
• the transmission channel includes a first transmission channel through which the random number sequence is transmitted from the transmitter to the receiver and a second transmission channel through which actual data are transmitted to the receiver.