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Method and apparatus for selectively denying access to encoded data

  • US 6,928,551 B1
  • Filed: 10/27/2000
  • Issued: 08/09/2005
  • Est. Priority Date: 10/29/1999
  • Status: Expired due to Term
First Claim
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1. A method for selectively denying access to encoded data, said method comprising the steps of:

  • loading an encryption key into a mission planning workstation at a first location;

    connecting a media device to said mission planning workstation;

    loading said encryption key from said mission planning workstation into said media device;

    encrypting sensitive data using said encryption key;

    loading the encrypted data onto the media device;

    loading unencrypted data onto a media device, wherein data necessary to enable a target portable computing device associated with a vehicle to return to a location selected as a mission end location remains unencrypted;

    disconnecting said media device from the mission planning workstation;

    connecting a media device to the target portable computing device;

    powering up the target portable computing device, thereby enabling it to execute a desired program or process;

    transferring said encryption key to volatile memory from said media device;

    transporting the target portable computing device and media devices to a location physically distant from the mission planning workstation;

    deleting said encryption key from said media device in response to said transport step;

    maintaining said encryption key only in volatile memory after said deleting step; and

    deleting the encryption key from volatile memory resident on the target portable computing device responsive to an operator;

    orautomatically deleting the encryption key from volatile memory resident on the target portable computing device in the event of a loss of power to the target portable computing device.

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