How distribute the session key to each entity of mobile IP in the dynamic HA mode. And how to resolve handoff problem of HA and the variety home address of MN.

• 采用动态家乡代理后的密钥分发如何进行,以及HA的切换问题和MN的家乡地址发生改变等问题进行了深入的研究,提出了解决办法。