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Secure instant messaging

  • US 7,949,873 B2
  • Filed: 06/30/2005
  • Issued: 05/24/2011
  • Est. Priority Date: 06/30/2005
  • Status: Expired due to Fees
First Claim
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1. A method, comprising:

  • utilizing a digital rights management service of a messaging device to randomly generate a challenge identifier;

    encrypting, at the messaging device, the challenge identifier with a first encryption key embedded in a first issuance license, thereby generating an encrypted challenge message, wherein the first issuance license is associated with a recipient messaging device located at a separate network location;

    communicating, from the messaging device to the recipient messaging device, the encrypted challenge message via a peer-to-peer communication link without utilizing a centralized messaging service;

    receiving, at the messaging device, an encrypted challenge return from the recipient messaging device, wherein the encrypted challenge return is a return challenge identifier encrypted with a second encryption key that is embedded in a second issuance license specific to the messaging device;

    decrypting the encrypted challenge return thereby providing the return challenge identifier;

    verifying that the return challenge identifier matches the challenge identifier;

    responsive to the verifying, establishing that network communications are secure when transmitting communications with the recipient messaging device;

    encrypting a communication to generate an encrypted communication that includes a control policy limiting use of the communication when received at the recipient messaging device; and

    communicating, from the messaging device to the recipient messaging device, the encrypted communication via the peer-to-peer communication link.

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