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Data transmission system, data transmission method, and device

  • US 20060239455A1
  • Filed: 01/19/2004
  • Published: 10/26/2006
  • Est. Priority Date: 01/17/2003
  • Status: Active Grant
First Claim
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1. A data-transmission system that sends transmission data, which has been encrypted by us ing at least one conversion constant from among a first conversion constant second conversion constant and third conversion constant, from an apparatus on the sending side to an apparatus on the receiving side, wherein said apparatus on the sending side comprises:

  • a conversion-constant selection means of selecting said first conversion constant, said second conversion constant and said third conversion constant;

    an encryption means of using said second conversion constant, or said second conversion constant and said third conversion constant to encrypt said transmission data to a first substitute value, and using said first conversion constant, or said first conversion constant and said third conversion constant to encrypt said transmission data to a second substitute value;

    a first-signal-generation means of generating a first signal that contains said first substitute value and said first conversion constant;

    a memory means of storing a pattern-conversion constant that corresponds to said third conversion constant;

    a second-signal-generation means of generating a second signal that contains said second substitute value, said second conversion constant and said pattern-conversion constant; and

    a transmission means of sending said first signal to said apparatus on the receiving side and said second signal to a relay apparatus;

    said relay apparatus comprises;

    a memory means of storing a third conversion constant that corresponds to said pattern-conversion constant;

    a signal-generation unit that receives said second signal, and converts said pattern-conversion constant contained in said second signal to said third conversion constant to generate a second′

    signal; and

    a transmission means of sending said second′

    signal to said apparatus on the receiving side; and

    said apparatus on the receiving side comprises;

    a reading means of receiving said first signal from said apparatus on the sending side and said second′

    signal from said relay apparatus, and reading said first substitute value and said first conversion constant from said first signal, and reading said second substitute value, said second conversion constant and said third conversion constant from said second′

    signal;

    a decoding means of using said conversion constants that were used in encrypting said first substitute value and said second substitute value to decode said first substitute value and said second substitute value to first decoded data and second decoded data, respectively; and

    an authentication means of authenticating said first signal and said second′

    signal from said first decoded data and said second decoded data.

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