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Mobile and embedded devices are becoming inevitable parts of our dailyroutine. Similar to other electronic devices such as read access memory (RAM)and storage, mobile devices require to authenticate and to be authenticated ina secure way. Usually, this can be accomplished by servers which possessprivate information for all devices. Since these devices are inherently mobileand operating in untrusted environments, they are prone to be accessed byuntrustworthy users. Physical unclonable function (PUF) is a unique physicalfeature of a semiconductor device such as a microprocessor that can begenerated from physical conditions such as supply voltage, temperature, etc.Ring oscillators are the principal parts of PUFs that are synthesized on afield-programmable gate array (FPGA) or an application-specific integratedcircuit (ASIC). Password manager systems are used in order to keep a databaseof usernames and password for clients in order for registration andauthentication. This table plays a crucial role in authentication in manysystems. Hence, security is one of the important features of these systems.Normally, in these tables only usernames and passwords are stored; however,they are vulnerable to many attacks. So, the first method of enhancing thesecurity is using the hash instead of the original data, but, advanced hackerscan break these hash data again. Hence, the method that we are going to use inthis project is utilizing PUF to store the challenge of each user instead ofsaving the hash of passwords.

Ring Oscillator and its application as Physical Unclonable Function (PUF) for Password Management