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Published on June 25, 2020. Uko Victor Sorochi, University of Port Harcourt, Nigeria. (corresponding e-mail: Sorochivictor gmail.com) Nasiru Abdulsalam, Nascomsoft Embedded, Nigeria. (e-mail: annasiriabdulsalam@gmail.com) Isa Abdulrauf Inusa, Abubakar Tafawa Balewa University, Nigeria. (e-mail: raufisa37@gmail.com). control systems have been designed over the years to prevent access to unauthorized users. The main aim for providing locks for our home, school, office and building is for security of our lives and properties. It is therefore important to have a convenient way of achieving this goal [5]. As an indication to man’s progressive efforts in securing buildings, mechanical lock systems were invented as a building panacea to bridge security gaps. Though the mechanical lock system served purpose, it was often prone to burglar attack by criminals. Furthermore, users of such mechanical locks umpteenth times misplace keys to the lock system, leaving them with the only alternative of damaging the lock to gain access. Direct human involvement in the operation of mechanical lock systems reduced the efficiency of the system and made the utilization of the system burdensome. To annul challenges of mechanical lock systems in rendering building security, automated systems evolved. Among the automated innovation grafted for granting access to buildings include: Bluetooth, biometrics, RFID (radio frequency identity) and voice recognition technologies. The innovative architecture was not void of peculiar challenges. For example, the Bluetooth system has a limited range for operation. The biometric system is not private to users and can be easily hacked. The voice recognition system can be easily intercepted by recording users’ voice using playback audio recorders, while the RFID system suffers from cloning and spoofing. As a security enhancement strategy, an automated system called a one time password (OTP) technology can be incorporated in any of the aforementioned building security system. The OTP technology can also act as a standalone security technology for building access and other multiple purposes as a security measure. OTP is a string of characters or numbers automatically generated to be used for single login attempt. OTP can be sent to the user’s phone via SMS (short message Service) or push messaging and is used to protect web-based service, private credentials and data. OTP’s minimizes the risk of fraudulent login attempt and thus the risk of stolen data. OTP’s come in all shapes and sizes but always add an extra layer of authentication. [9] The authentication system when used for building security access will practically be impossible for unauthorized users to gain access if well incorporated with aforementioned security methods or acting as a standalone. OTPs are not vulnerable to reply attack and have a great advantage on static password. [10] @ Security Enhancement for Building Access, Using One Time Password (OTP) Technology