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Security system for television signal encryption

  • US 4,802,215 A
  • Filed: 03/15/1985
  • Issued: 01/31/1989
  • Est. Priority Date: 07/22/1983
  • Status: Expired due to Term
First Claim
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1. Apparatus for securely transmitting a scrambled information signal to a receiver, comprising:

  • means for scrambling an input information signal;

    means for transmitting the scrambled information signal;

    means for generating a first encryption key required at said receiver to enable descrambling of said transmitted scrambled information signal;

    means for generating a second encryption key indicative of an authorized receiver;

    means for forming a first block of information including the first encryption key;

    first encryption means for encrypting the first block of information using the second encryption key to provide a first encrypted signal;

    means for forming a second block of information including the first encryption key;

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