  Mobile and embedded devices are becoming inevitable parts of our daily
routine. Similar to other electronic devices such as read access memory (RAM)
and storage, mobile devices require to authenticate and to be authenticated in
a secure way. Usually, this can be accomplished by servers which possess
private information for all devices. Since these devices are inherently mobile
and operating in untrusted environments, they are prone to be accessed by
untrustworthy users. Physical unclonable function (PUF) is a unique physical
feature of a semiconductor device such as a microprocessor that can be
generated from physical conditions such as supply voltage, temperature, etc.
Ring oscillators are the principal parts of PUFs that are synthesized on a
field-programmable gate array (FPGA) or an application-specific integrated
circuit (ASIC). Password manager systems are used in order to keep a database
of usernames and password for clients in order for registration and
authentication. This table plays a crucial role in authentication in many
systems. 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 the
security is using the hash instead of the original data, but, advanced hackers
can break these hash data again. Hence, the method that we are going to use in
this project is utilizing PUF to store the challenge of each user instead of
saving the hash of passwords.
