Abstract: With the development of he Internet and the wide use of wireless handsets, more and more attention is paid to the mobile IP. Authentication and registration in the mobile IP is the key for the Mobile IP to proceed. an integrated scheme is proposed in this paper according to the authentication and registration in the Mobile IP. The scheme realizes the incorporation of authentication and registration. key distribution among MH, FA and HA is also achieved in the scheme. In addition, public key and symmetric key operations are employed simultaneously to ensure the secure transmission and authentication of data.

Key words: mobile IP, AAA, registration