In this new era, security is being the major concern in day to day life. To secure the data many security models are been introduced. Advanced Encryption Systems such as encryption, decryption methods are having a drawback, that it uses a key to store the data in its devices. The key can be easily cloned by any 3^rd party person and there is a chance of losing data and the device security. PUF (Physically Unclonable Function) is mainly used for device authentication. It helps to identify the data and its device while performing authentication process. In front-end the PUF is used for device authentication where as in back-end LFSR (Linear-Feedback-Shift-Register) is used to generate random numbers which helps to increase more security. Previously the PUF based LFSR is been implemented and observed the results. In this project the PUF is implemented using LP LFSR (Low power Linear Feedback Shift Register) in order to show more improvement in terms of security by increasing the randomness.