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Coding method and system with enhanced security

  • US 4,225,935 A
  • Filed: 08/30/1977
  • Issued: 09/30/1980
  • Est. Priority Date: 08/30/1977
  • Status: Expired due to Term
First Claim
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1. A method of producing a code with enhanced acquisition security, comprising the steps of:

  • generating a plurality of linear component codes, C1, C2, . . . Cn ;

    combining said linear component codes to form a linear first composite code in accordance with a first composite rule of such a character that said first composite code does not correlate with said component codes;

    nonlinearizing said first composite code to form a nonlinear second composite code; and

    combining said linear component codes, C1, C2, . . . Cn-1, with said nonlinear second composite code to form a nonlinear acquisition composite code in accordance with a second composite rule of such a character that at least one of said component codes correlates with said acquisition composite code.

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