IEEE Consumer Electronics Magazine - July/August 2021 - 96

Physical Unclonable Function
Figure 6. PUF FoMs of second testbench. (a) Uniqueness. (b) Reliability. (c) Randomness.
performance of a PUF module, such as power
supply variations, environmental factors such as
temperature, and aging effects. In a normal PUF
module, the ideal value of reliability of a PUF is
0%, ability to generate the same response for a
respective challenge under the effects.14 But, the
PUF proposed in this article is responsible to
generate unique keys every time the module is
run. So the reliability of the proposed PUF module
is 50%. As shown in Figure 5(b), the reliability
of the PUF is 48.2% in the first testbench and
50.02%, as shown in Figure 6(b) in the second
testbench.
Randomness is the other property of the PUF
to generate unique keys from a respective module.
The challenges and the keys generated by
the PUF are usually in binary. The keys generated
by a PUF are required to have equal number
of " 1 " and " 0 " bits. The ideal value of the randomness
is 50%.14 As shown in Figure 5(c), the randomness
of the keys generated by the PUF
module is 62.02% in the first testbench and
50.29% as shown in Figure 6(c) in the second
testbench.
PIM Experimental Results
Figures 7 and 8 show the working of PIM at
the client and the server side. Figure 7 shows the
output of the client on an SBC. Each figure represents
multiple runs from the same SBC showing
the output from PUF module and the signature.
Initially, the UIT is generated and the hash of the
UIT is calculated. The hash is signed and is transmitted
with the public key to the server. The
packet transmitted to the server is also shown in
Figure 7.
A database is used to store the data in
the prototype. Figure 8(a) shows the database
Figure 7. Client device screen output. (a) SBC Run 1
(b) SBC Run 2 (c) Arduino Run 1. (d) Arduino Run 2.
96
Figure 8. Output and database at the server.
(a) Database. (b) Server output.
IEEE Consumer Electronics Magazine

IEEE Consumer Electronics Magazine - July/August 2021

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