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Techniques for handshake-free encrypted communication using symmetric key caching during request-and-response

  • US 9,432,189 B1
  • Filed: 03/08/2013
  • Issued: 08/30/2016
  • Est. Priority Date: 03/07/2013
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a processor circuit on a device;

    a key component operative on the processor circuit to retrieve a first symmetric encryption key from a key store using an identifier associated with a second device;

    a message component operative on the processor circuit to construct a message comprising a data section and a timestamp, the data section encrypted using the first symmetric encryption key, the timestamp comprising a time the message was constructed and to indicate a start of a validity period for the message; and

    a network component operative on the processor circuit to transmit the message to the second device and to receive a response to the message from the second device, the response encrypted using the first symmetric encryption key and comprising a second symmetric encryption key, the key component operative to replace the first symmetric key with the second symmetric key in the key store and associate the second symmetric key with the identifier associated with the second device, the second symmetric key to encrypt subsequent messages to the second device.

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