Asalefew, Abyot (PhD)Kassa, Girmay2018-06-282023-11-042018-06-282023-11-042007-08http://etd.aau.edu.et/handle/123456789/4387Route optimization is an enhancement to mobile IP which improves routes for the communication of mobile node with its correspondent nodes. Despite its improvement for the performance of this communication, it brought additional security requirements for the Mobile IP communications since it needs securing the new binding update messages. If the binding update toward the home or correspondent nodes is attacked, future communication between the mobile node and the node to which the binding update was intended to reach will be highly in threat. For this reason the IETF designed solution to secure binding update toward the home agent and the correspondent nodes. The binding update toward the home agent uses the security architecture for Internet protocol and no attacks or flaws have been observed. However the binding update toward correspondent nodes is secured with return routable protocol and there are some flaws that are seen on it which can be analyzed from the design. This thesis presents such flaws on the protocol and describes a solution designed to avoid these security problems. In the solution the return routable protocol is modified to decrease the number of message transfers to send binding update and integrated to work with IPSec for securing it. The design is implemented for simulation using ns-2.29 with C++ and tested for its security and performance. Analysis made from the test results showed that security requirements of binding update to the correspondent nodes in Mobile IP communication system are satisfied as the correspondent node is able to identify false binding updates. In addition the system’s performance is equivalent to the performance of base Mobile IP; the average packet processing time obtained from simulation is 0.75 sec and the average network delay is 12ms.enCommunicationThesis