Mobile IPv4 Challenge/Response Extensions

Abstract

Mobile IP, as originally specified, defines an authentication extension (the Mobile-Foreign Authentication extension) by which a mobile node can authenticate itself to a foreign agent. Unfortunately, this extension does not provide ironclad replay protection for the foreign agent, and does not allow for the use of existing techniques (such as CHAP) for authenticating portable computer devices. In this specification, we define extensions for the Mobile IP Agent Advertisements and the Registration Request that allow a foreign agent to use a challenge/response mechanism to authenticate the mobile node.