Pseudorandom Number Generator Based on Three Kinds of Four-Wing Memristive Hyperchaotic System and Its Application in Image Encryption

Table 7

Comparison of the three kinds of FWMHSs with recent literature.

Refs.	[10]	[12]	[37]	[40]	[49]	[50]	Proposed
Type	PRNG	PRNG	PRNG	PRNG	PRNG	PRNG	PRNG
Entropy source	Adaptive chaotic maps	Multimodal map	4D hyperchaotic system	5D memristive hyperchaotic system	Two Tinkerbel maps	Three chaotic maps	Three kinds of FWMHSs
Past processing	✓	XOR	✓	XOR	✓	XOR	XOR
Test suit	NIST	NIST	NIST	NIST	NIST, ENT DIEHARD	NIST	NIST, ENT
Key space						—
Key sensitivity	—	?	49.74% (bit change rate)	50.0028% (bit change rate)	?	✓	49.911% (bit change rate)
Correlation	<0.02	<0.05	−0.00047	0.000198	−0.000330	—	0.0018
Entropy	—	—	7.9896	—	—	—	—
Speed (Mbit/s)	0.3	—	0.5017	—	0.4901	—	0.3256
Comparison analysis	✓	—	—	✓	—	—	✓
Entropy complexity	—	—	—	—	—	—	✓