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Key exchange method and apparatus

  • US 10,397,775 B2
  • Filed: 02/07/2018
  • Issued: 08/27/2019
  • Est. Priority Date: 03/05/2013
  • Status: Expired due to Fees
First Claim
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1. A method of key exchange, wherein a device to device (D2D) link is established between a first user equipment and a second user equipment, and the method comprises:

  • acquiring, by the first user equipment, a second key, wherein the second key is shared by a network device and the first user equipment;

    generating, by the first user equipment, a first key according to the second key and a first parameter by using a key derivation function, wherein the first parameter comprises a random number generated by the network device; and

    transmitting, by the first user equipment, the first key to the second user equipment;

    protecting, by the first user equipment, communication information transmitted on the D2D link by using the first key.

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