| 摘要 |
PURPOSE:To attain sure ciphering and decoding by constituting the 1st circuit which ciphers even consecutive 0s and outputs '0' when 1s are consecutive as two stages with the 2nd circuit of two-stage constitution executing inverse logic to the 1st circuit. CONSTITUTION:A ciphering device consists of two stages of a circuit comprising a shift register 1a, exclusive OR circuits 2a, 3a and an inverter 4a. That is, the device is provided further with a circuit comprising a shift register 1b, exclusive OR circuits 2b, 3b and an inverter 4b. Even when 0s or 1s are consecutive in an input data A, a ciphered output data E is obtained. A decoder is constituted symmetrically to the ciphering device and consists of shift registers 5a, 5b, exclusive OR circuits 6a, 6b, 7a, 7b and inverters 8a, 8b. |
