Session Key Exchange Based on Dynamic Security Association for Mobile IP Fast Handoff

For Low Latency Handoffs(LLH) [1] to be fast and effective, the Mobile IP session keys distributed by home AAA(Authentication, Authorization, and Accounting) server should be reused [2]. This can decrease the number of signaling messages to the home network, and reduce the signaling delay when a mobile node moves from one foreign agent to another, within the same visited domain. To reuse the session keys in a secure fashion, we present a method that performs the LLH without requiring further involvement by home AAA server. To prevent session stealing attack, the method provides the confidentiality and integrity of session keys in the phase of key exchange between old foreign agent and new foreign agent by using Diffie-Hellman key agreement. It allows the mobile node to perform LLH with fast as well as secure operation.