Table 4 NIST 15 tests’ results.

From: Memristor-based PUF for lightweight cryptographic randomness

NIST tests

P value

Bit string

Frequency Test

0.309

8740

Block Frequency Test

1

8740

Longest Run of Ones

0.55

8740

Runs

0.325

8740

Ranks

0.45

8740

Discrete Fourier Transform

0.731

8740

Serial

P1 = 0.18, P2 = 0.85

8740

Approximate Entropy

0.339

8740

Cumulative Sums

Pf = 0.263, Pr = 0.539

8740

Linear Complexity

0.8684

8740

Non-Overlapping Template

0.2918

1048576

Overlapping Template

0.1829

1048576

Random Excursions

0.1201

1048576

Random Excursions Variant

0.1153

1048576