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In the Mobile IPv6 (MIPv6) protocol, a Mobile Node (MN) is a mobile device with a permanent Home Address (HoA) on its home link. The MN will acquire a Care-of Address (CoA) when it roams into a foreign link. It then sends a Binding Update (BU) message to the Home Agent (HA) and the Correspondent Node (CN) to inform them of its current CoA so that future data packets destined for its HoA will be forwarded to the CoA. The BU message, however, is vulnerable to different types of security attacks such as: the Man-In-The-Middle (MITM) attack, session hijacking attack, Denial-of-Service (DoS) attack. The current security protocols in MIPv6 are not able to effectively protect the BU message against these attacks. The Private Key-based Binding Update (PKBU) protocol is proposed in this thesis to overcome the shortcomings of some existing MIPv6 protocols. The proposed PKBU protocol incorporates:(a) a method …