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

Claim 25:
26. A method by a first network device for rekeying a security association (SA) applied in a network system including a first network device and a second network device, the method comprising:
establishing an Internet Key Exchange (IKE) tunnel and an Internet Protocol Security (IPSec) tunnel between the first network device and the second network device and
sending 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 does not carry a cryptographic suite associated with the first network in the case of that there is no change in a cryptographic suite associated with the first network device;
receiving 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 in the case of there is no change in a cryptographic suite associated with the second network device;
rekeying, by the first network device, 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; wherein the first rekey response does not carry a TS payload associated with the second network device; and
wherein rekeying, by the first network device, the SA without changing flow information associated with the SA.