Title: Encryption method, cryptogram decoding method, encryptor, cryptogram decoder, transmission/reception system, and communication system
Application Number: 200610139323 Application Date: 2006.09.22
Publication Number: 1937008 Publication Date: 2007.03.28
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G09C1/00
Applicant(s) Name: Fujitsu Ltd. Address:
Inventor(s) Name:
Attorney & Agent: lihui ludun gang
Abstract:
    Encryption method, cryptogram decoding method, encryptor, cryptogram decoder, transmission/reception system, and communication system are provided in the invention. 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 step by irregularly associating with another signal by physical random numbers, and a channel coding step for channel-coding the output of the second 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 and demodulated into the input data, and output 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.
Time: 34