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Write once system and method for facilitating digital encrypted transmissions

  • US 20070113102A1
  • Filed: 01/04/2007
  • Published: 05/17/2007
  • Est. Priority Date: 11/02/2000
  • Status: Active Grant
First Claim
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1. A digital device for facilitating use of encryption for digital signals, the interface device comprising:

  • a non-volatile memory having a write-protectable area allocated for storing an encryption flag at a flag address and encryption data;

    said write-protectable area being rendered read-only when a predetermined flag value is stored at said flag address; and

    whereby encryption data stored in said write-protectable area of said non-volatile cannot be altered by a subsequent write operation to said non-volatile memory after said write-protectable area is rendered read-only.

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