A solution to Mobile IP registration for AAA

The Internet Engineering Task Force (IETF) Mobile IP working group has proposed the Mobile IP to support that an MH has the ability of roaming around a foreign domain. However, when it roams around a foreign domain, the authentication, authorization and accounting (AAA) for an MH must be done by the foreign domain. For this reason, the IETF suggests that the existence of some server capable of performing authentication, authorization, and accounting (AAA) services could help. So in this article we propose that employing simultaneously the public key cryptosystem and symmetric cryptosystem to accomplish the mission of Mobile IP registration for AAA.