Secure login by using One-time Password authentication based on MD5 Hash encrypted SMS

The combination of One Time Password (OTP), SMS Gateway, and MD5 Hash encryption algorithm are used to develop a more secured login procedure to access the web-based Academic Information System. The code to be encrypted consists of Student ID, phone number, and access time. The System needs three minutes for security login with SMS-based OTP. The constraint is narrowing the time for hackers to tap and infiltrate. This delay time is an average obtained from the survey among several service providers in Indonesia. The code generated from the system is better than Pseudo Random Number Generator (PRNG) in that the resulting code is never the same.