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Simple and effective public-key cryptosystem

  • US 4,306,111 A
  • Filed: 05/31/1979
  • Issued: 12/15/1981
  • Est. Priority Date: 05/31/1979
  • Status: Expired due to Term
First Claim
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1. A method of securely communicating over an insecure communication channel of the type wherein an original information signal is transformed into an encoded information signal according to an encryption algorithm, transmitted over said information channel between a transmitter and a receiver, received by said receiver and decoded to obtain said original information signal, said original information signal comprising at least two integers m1 and m2 where at least m1 represents information and 0<

  • m1 <

    M1 and 0<

    m2 <

    M2, where M1 and M2 are integers, said method comprising the steps of;

    producing a cryptogram x from said original information signal and a public encryption key (c1, c2 r), where c1, c2 and r are all integers, r is the product of two relatively prime numbers p1 and p2, and c1 and r are well as c2 and r are relatively prime, said cryptogram x being defined by;

    
    
    space="preserve" listing-type="equation">x=c.sub.1 m.sub.1 +c.sub.2 m.sub.2 (mod r)where c1 m1 +c2 m2 (mod r) is defined as the remainder of (c1 m1 +c2 m2)/r;

    transmitting said cryptogram x as said encoded information signal from said transmitter to said receiver;

    receiving said encoded information signal at said receiver;

    generating two simultaneous linear equations from said encryption algorithm; and

    solving said two simultaneous linear equations using said received cryptogram x, to thereby obtain said integers m1 and m2 of said original information signal.

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