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Global System for Mobile Communication (GSM) provides services such as Unstructured Supplementary Data (USSD) and Short Message Services (SMS), among other services. In the design of GSM architecture, SMS and USSD services are designed for subscribers to send non-sensitive messages across the GSM network between two or more devices. The existing USSD protocol provides efficient services with weak security mechanism, while the SMS provides flexible but inefficient services with no security mechanism. Therefore, despite the high flexibility and usability advantages of SMS across GSM network, it has not enjoyed wide usage in security critical applications such as medical, banking, military and business information systems. This research was therefore designed to harness the strength of the enhanced Dynamic Dual Key Cryptography Algorithm to provide secured and efficient SMS services. Window Application Server was implemented using Visual Studio.Net Framework. The security and efficiency of SESMBS was demonstrated with prototype of an ebanking system with 10 unauthorized users and 10 authorized users. The security performances of SESMBS were evaluated based on attack success in the instances of brute force, while the efficiency performances were evaluated based on throughput and latency. The results of attack success showed that with 120 attack trials in the instances of both brute force and dictionary attack threats, none of the unauthorized users was successful on SESMBS, while all the authorized users were successful, with average throughput of 0.8778 i/s and 0.3833 i/s for fixed messages and varying messages respectively, and latency of 6.1 seconds. Also, the messages were processed efficiently with the highest processing time of 10-seconds, which fell below the 20 seconds maximum threshold of SMS.

SECURED AND EFFICIENT SHORT MESSAGE SERVICES BASED MOBILE BANKING SYSTEM USING DYNAMIC DUAL KEY ENCRYPTION ALGORITHM (SESMBS)