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Certified transmission system

  • US 8,027,923 B2
  • Filed: 12/03/2007
  • Issued: 09/27/2011
  • Est. Priority Date: 04/03/2001
  • Status: Expired due to Term
First Claim
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1. A method comprising:

  • receiving, at a server, a signed receipt and an encrypted symmetric key from an intended recipient, the signed receipt memorializing receipt of an encrypted message by the intended recipient;

    verifying the signed receipt at the server;

    transferring the verified receipt to a sender of the encrypted message; and

    providing, from the server to a device associated with the intended recipient, a symmetric key corresponding to the encrypted symmetric key, the symmetric key generated by the sender of the encrypted message.

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