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Integrated circuit comprising encryption circuitry selectively enabled by verifying a device

  • US 6,973,570 B1
  • Filed: 12/31/1999
  • Issued: 12/06/2005
  • Est. Priority Date: 12/31/1999
  • Status: Expired due to Term
First Claim
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1. An integrated circuit for selectively encrypting plaintext data received from a first device to produce encrypted data to send to a second device, the integrated circuit comprising:

  • 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 device; 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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