ENCRYPTION METHOD, CRYPTOGRAM DECODING METHOD, ENCRYPTOR, CRYPTOGRAM DECODER, TRANSMISSION/RECEPTION SYSTEM, AND COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an encryption technique allowing use of classic Y-00 scheme performed using classic physical random numbers instead of quantum fluctuation in electrical communication and data storage in recording media. SOLUTION: The encryption technique includes: a first modulation step for multilevel-modulating input data by associating with specific state pairs determined by physical random numbers; a second modulation step for outputting the output of the first modulation step by irregularly associating with another signal by physical random numbers; and a channel coding step for channel-coding the output of the second modulation step into desired codeword and outputting it as encrypted data, wherein the decoded signal obtained by channel-decoding the encrypted data can be discriminated which of specific state pairs the signal corresponds to, demodulated into the input data, and outputted by the first modulation by state pairs other than the specific state pairs and the second modulation by a physical random number different from the physical random number. COPYRIGHT: (C)2007,JPO&INPIT