Improved Chaos-Based Cryptosystem for Medical Image Encryption and Decryption

Table 13

Simulation results of the NIST 800-22 test for the proposed PRNG.

Statistical	value	Status
Status frequency	0.4372742	Pass
Block frequency (m = 128)	0.4372742	Pass
Forward CUSUM	0.4372742	Pass
Reverse CUSUM	0.4372742	Pass
Runs	0.4372742	Pass
Long runs of ones	0.4372742	Pass
Binary matrix rank	0.4372742	Pass
Spectral DFT	0. 8755390	Pass
Nonoverlapping template (m = 9)	0.7070707	Pass
Overlapping template (m = 9)	0.5449921	Pass
Universal	0.0713232	Pass
Approximate entropy (m = 10)	0.0125474	Pass
Random excursions (x = +1)	0.9030558	Pass
Random excursions variant (x = −1)	0.3974291	Pass
Linear complexity (M = 500)	0.1922722	Pass