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System, method, and computer program for communicating a key recovery block to enable third party monitoring without modification to the intended receiver

  • US 6,061,454 A
  • Filed: 06/27/1997
  • Issued: 05/09/2000
  • Est. Priority Date: 06/27/1997
  • Status: Expired due to Fees
First Claim
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1. A method for communicating a key recovery block signal from a sender to a receiver over a communication link, for an entity coupled to the link, to monitor the key recovery block signal, comprising:

  • providing an echo request protocol program to the sender;

    providing an echo reply protocol program to the receiver;

    sending an echo request message signal with a key recovery block signal from the sender using said echo request protocol request message, over the link to the sender; and

    sending an echo reply message signal from the receiver using said echo reply protocol in response to the echo request message signal, over the link to the sender.

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