Robust pre-authentication protocol for wireless network

User authentication is very important in mobile networks; Evolved Packet System Authentication and Key Agreement (EPS-AKA) protocol used in 4^th generation (LTE) networks to allow legitimate users access services. This algorithm has many security weaknesses, as DOS attack, reveal of user id, MITM, and Replay attack. In this paper, a proposed protocol called Robust Evolved Packet System Authentication and Key Agreement protocol (REPS-AKA) introduced to solve the security vulnerabilities of standard one. The proposed protocol contain a pre-authentication method based on Globally Unique Temporary Identifier (GUTI); this technique is efficient for mobile networks as a pre-authentication manner. To verify the efficiency of the protocol we used a tool called Scyther. Analysis done, using C language, by calculating the execution time for both algorithms. Validation for the proposed protocol, using C# language, is implemented using client-server application program.