Patent ID: 8255465
Filing Date: 2012-08-28
Classification: H04L

Abstract:
1. A method comprising: at a network processor connected to a local network, intercepting a network communication message originating from a user processor that is different from the network processor connected to the local network and which network communication message is destined for a remote processor connected to the local network via an external network; creating a unique message appendix for the intercepted network communication message to prevent replay attacks on the intercepted network communication message using: encrypting the unique message appendix using a combination of an asymmetric encryption technique that does not require key exchanges and a symmetric encryption technique that is different from the asymmetric encryption technique so that the information in the unique message appendix associated with the local network may be transmitted securely over a public network; encoding the encrypted unique message appendix to allow the unique message appendix to be added to the network communication message without altering the contents of the network communication message; and appending the encoded, encrypted unique message appendix to the network communication message for transmission between the network processor connected to the local network and the remote processor.