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Encrypting a digital object on a key ID selected therefor

  • US 7,412,061 B2
  • Filed: 11/05/2004
  • Issued: 08/12/2008
  • Est. Priority Date: 03/27/1999
  • Status: Expired due to Fees
First Claim
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1. A computer-readable medium having computer-executable instructions for producing a key (KD) for decrypting a digital object, the digital object having been encrypted by:

  • selecting a key ID for the digital object;

    selecting a function ƒ

    ( ) having an input and an output;

    employing the selected key ID as the input to the function ƒ

    ( );

    employing the output of such function ƒ

    ( ) as the key (KD) for the digital object;

    ƒ

    (key ID)custom characterkey (KD),encrypting such digital object according to such key (KD); and

    distributing such encrypted digital object, along with the key ID, the computer-readable medium comprising instructions for;

    receiving a request for the key (KD) from a requestor, the request including the key ID;

    approving the request;

    employing the included key ID as the input to the function ƒ

    ( );

    employing the output of such function ƒ

    ( ) as the requested key (KD);

    ƒ

    (key ID)custom characterkey (KD); and

    distributing such key (KD) to the requestor.

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