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Secure data encoder and decoder

  • US 6,275,587 B1
  • Filed: 06/30/1998
  • Issued: 08/14/2001
  • Est. Priority Date: 06/30/1998
  • Status: Expired due to Term
First Claim
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1. A method of encoding a serial bit stream of digital data, the method comprises:

  • placing a first portion of bits from the input bit stream into bit positions of an encoded output unit in accordance with a first value, said first number of bits aligned to a bit position in the encoded output unit in accordance with a second value and inserting bits of arbitrary value into remaining bit positions of the unit of the encoded output unit;

    placing a remaining portion of bits from the input bit stream into bit positions of a second encoded output unit in accordance with a different, first value, said remaining portion of bits aligned to a bit position in the second encoded output unit in accordance with a different, second value and inserting bits of arbitrary value into remaining bit positions of the second unit of the encoded output unit; and

    wherein the bits of arbitrary value are noise bits.

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