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Variable-key cryptography system

  • US 5,619,576 A
  • Filed: 04/03/1995
  • Issued: 04/08/1997
  • Est. Priority Date: 03/14/1994
  • Status: Expired due to Fees
First Claim
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1. A method for encrypting and decrypting input digital data, comprising the steps of:

  • providing a first key comprising a sequence of bits;

    selecting a plurality of invariant bit positions in response to said first key; and

    providing output digital data having in each of said invariant bit positions a bit equal in value to said bit in a corresponding position in said input digital data and having in all other positions bits determined in response to said first key.

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