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Disk drive comprising encryption circuitry selectively enabled by verifying a circuit that provides plaintext data

  • US 6,735,693 B1
  • Filed: 01/28/2000
  • Issued: 05/11/2004
  • Est. Priority Date: 01/28/2000
  • Status: Expired due to Term
First Claim
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1. A disk drive comprising:

  • a disk for storing encrypted data;

    a first circuit for providing plaintext data; and

    a second circuit comprising;

    controllable encryption circuitry for encrypting the plaintext data into the encrypted data, the controllable encryption circuitry comprising;

    a data input;

    an enable input;

    a data output;

    a plaintext input for providing the plaintext data to the data input;

    an encrypted text output for providing the encrypted data from the data output;

    a first control input for receiving a first device authentication signal for authenticating the first circuit; and

    a first verification circuit, responsive to the first device authentication signal, for producing a first verification signal for use in controlling the enable input of the encryption circuitry to enable the encryption circuitry to provide the encrypted data via the encrypted text output.

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