Encryption method, cryptogram decoding method, encryptor, cryptogram decoder, transmission/reception system, and communication system

An encryption method and encryption technology, which are applied in the fields of encryption, cipher decoding, cipher, cipher decoder, sending/receiving system and communication system, and can solve the problem that encryption technology cannot be applied to recording medium and so on.

Active Publication Date: 2007-03-28
FUJITSU LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, up to now, the embodiment of this classic Y-00 scheme has been applied to analog DSR, therefore, its output must be a multilevel signal, and this en

Method used

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  • Encryption method, cryptogram decoding method, encryptor, cryptogram decoder, transmission/reception system, and communication system
  • Encryption method, cryptogram decoding method, encryptor, cryptogram decoder, transmission/reception system, and communication system
  • Encryption method, cryptogram decoding method, encryptor, cryptogram decoder, transmission/reception system, and communication system

Examples

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Embodiment Construction

[0096] Embodiments of the present invention will be described below with reference to the drawings.

[0097][1] The structure of the encryptor in this embodiment

[0098] Fig. 1 is a block diagram showing the structure of an scrambler as an embodiment of the present invention, as shown in Fig. 1 , the scrambler 10 in this embodiment is structured to be provided with a pseudo-random number generator 11, a first modulation section 12, A physical random number generator 13 , a second modulation section 14 and a channel coding section 15 .

[0099] Pseudo-random number generator (pseudo-random number generation part, modulation pseudo-random number generation part) 11 generates and outputs modulation pseudo-random number r according to a preset encryption key K i . For example, if the encryption key K is a 100-bit binary number, it is generated from the pseudo-random number generator 11 (2 100 -1) bit binary number, that is, the period is (2 100 -1) A pseudo-random number of b...

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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.

Description

technical field [0001] This invention relates to encryption / cryptographic decoding techniques used in systems in which information is encrypted for transmission and reception, and more particularly to techniques that use classical physical random numbers instead of quantum fluctuations in the Yuen quantum cryptography system , to achieve classical Yuen encryption with much greater encryption strength than traditional mathematical encryption, and can be applied to various media. Background technique [0002] In modern networks, as an encryption method, mathematical encryption such as public key cryptography is used. Typical examples include stream ciphers (classical ciphers). FIG. 17 is a block diagram showing the structure of a general transmission / reception system to which a stream cipher is applied, and the transmission / reception system 100 shown in FIG. 17 is constructed to include: performing encryption; and a cipher decoder 120 for decoding ciphertext transmitted via ...

Claims

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Application Information

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IPC IPC(8): G09C1/00
Inventor 吉田節生広田修尾中宽
Owner FUJITSU LTD
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