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Multiple-destinational cryptosystem for broadcast networks

  • US 4,365,110 A
  • Filed: 06/05/1979
  • Issued: 12/21/1982
  • Est. Priority Date: 06/05/1979
  • Status: Expired due to Term
First Claim
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1. A method of sending a plurality of messages in the form of a single tranmission signal through a single transmitting station to a plurality of destinations through at least one receiving station comprising;

  • multiplying each of said messages by an enciphering key corresponding to its intended destination;

    combining the products of said multiplication step into a cryptogram comprising said single transmission signal,said cryptogram being defined by
    
    
    space="preserve" listing-type="equation">x=[Σ

    m.sub.i c.sub.i ] mod P,where P is the product of a plurality of prime numbers pi, ci are the enciphering keys corresponding to respective destinations and are defined by ci =di (di-1 mod pi), di is defined by P/pi, mi are numbers representing said plurality of messages, 0<

    mi <

    pi and 1≦

    i≦

    n;

    transmitting said cryptogram to said at least one receiving station; and

    dividing the received cryptogram by divisors corresponding to respective destinations to thereby recover the messages intended for each of said destinations.

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