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Write once system and method for facilitating digital encrypted transmissions

  • US 7,178,035 B1
  • Filed: 11/02/2000
  • Issued: 02/13/2007
  • Est. Priority Date: 11/02/2000
  • Status: Active Grant
First Claim
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1. A digital interface device for facilitating key encryption of a digital signal which is communicated from a computer system to an associated peripheral device, where the associated peripheral device decrypts the communicated digital signal for use, the interface device comprising:

  • a digital output;

    digital output formatting circuitry associated with said output;

    a non-volatile RAM for containing a BIOS for controlling digital output formatting having a specific write-protectable area allocated for storing an encryption key flag at a flag address and encryption key data; and

    said specific write-protectable area being rendered read-only only when a predetermined flag value is stored at said flag address whereby encryption key data may be stored in said specific area of said non-volatile RAM in connection with storing said predetermined flag value at said flag address such that stored encryption key data cannot be altered by a subsequent write operation to said non-volatile RAM.

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