Patent ID: 11943209
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A first network device for rekeying a security association (SA) in a network system comprising the first network device and a second network device, the first network device comprising computer instructions that when executed by a processor, cause the first network device to:
establish an Internet Key Exchange (IKE) and an Internet Protocol Security (IPSec) tunnel are established between the first network device and the second network device; and
send, a first rekey request to the second network device for rekeying a SA, wherein the first rekey request carries a first Security Parameter Index (SPI) and a cryptographic suite associated with the first network device;
receive a first rekey response from the second network device, wherein the first rekey response carries a second SPI and does not carry a cryptographic suite associated with the second network device when there is no change in a cryptographic suite associated with the second network device;
rekeying the SA according to the first SPI and the second SPI;
wherein:
when the SA is an IPSec SA which is a child SA of an IKE SA, the first rekey request does not carry a Traffic Selector (TS) payload carrying flow information associated with the first network device when there is no change in a flow information associated with the first network device; wherein the first rekey response does not carry a TS payload associated with the second network device when there is no change in a flow information associated with the second network device; and
the SA is rekeyed without changing flow information associated with the SA.