One Time Password (OTP) Based on Advanced Encrypted Standard (AES) and Linear Congruential Generator(LCG)

Security is a major issue when using internet services. Double-factor authentication is most used at this time to protect user's account. One example of double factor authentication is One Time Password (OTP). OTP is a password that is valid for only one login session. In this research OTP generated from plaintext which is a combination of username, handphone's number and access time. The Plaintext will be encrypted using Advanced Encrypted Standard (AES) and then taken 6 characters randomly using a Linear Congruential Generator (LCG). The results of this study indicate that OTP which is generated using LCG is not repetitive and the randomization is not easy to guess. This proposed method also capable to defend from sniffing attack.