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Efficient encryption, escrow and digital signatures

  • US 9,712,519 B2
  • Filed: 08/25/2015
  • Issued: 07/18/2017
  • Est. Priority Date: 03/13/2013
  • Status: Active Grant
First Claim
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1. A method of operating a user smart communication device to securely communicate email or text messages to another user via a network, comprising:

  • retrieving, from a network server, the other user'"'"'s certificate, where the other user'"'"'s certificate includes kpubOU, which is the public key of the other user'"'"'s private/public asymmetric key pair kpriOU/kpubOU;

    creating a session key (SK) for securing communications between the user and the other user;

    storing the SK;

    encrypting the SK with the other user'"'"'s public key, kpubOU;

    encrypting the SK with an escrow public key kpubES received from an escrow server;

    transmitting, to the network server, the SK encrypted with the other user'"'"'s public key kpubOU and the SK encrypted with the escrow public key kpubES, for forwarding the SK encrypted with the other user'"'"'s public key kpubOU to the other user via the network server and for storing the SK encrypted with the escrow public key kpubES at the network server, the stored SK encrypted with the escrow public key kpubES being accessible at the network server for transmission to an authorized eavesdropper for decrypting messages between the user and the other user;

    transmitting, to the other user via the network server, a first email or text message encrypted with the SK;

    receiving, from the other user via the network server, a second email or text message encrypted with the SK; and

    decrypting the received encrypted second message with the stored SK.

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