A Systematic Methodology for Multi-Images Encryption and Decryption Based on Single Chaotic System and FPGA Embedded Implementation

Table 1

NIST test results of sequences 𝑥₅(𝑘), 𝑥₆(𝑘), and 𝑥₇(𝑘).

Statistical test	𝑃 value of 𝑥5(𝑘)	𝑃 value of 𝑥6(𝑘)	𝑃 value of 𝑥7(𝑘)
Frequency	0.616305	0.595549	0.798139
Block frequency (𝑚=128)	0.834308	0.181557	0.699313
Cumulative sums	0.462694	0.597927	0.099022
Runs	0.042808	0.153763	0.494392
Long runs of ones	0.090936	0.534146	0.534146
Rank	0.289667	0.366918	0.554420
Spectral DFT	0.108791	0.637119	0.867692
Nonoverlapping templates (𝑚=9)	0.383827	0.455937	0.514124
Overlapping templates (𝑚=9)	0.236810	0.699313	0.013569
Universal	0.334538	0.455937	0.637119
Approximate entropy (𝑚=10)	0.616305	0.275709	0.350485
Random excursions	0.3211526	0.236810	0.455937
Random excursions variant	0.299251	0.419021	0.236810
Linear complexity (𝑀=500)	0.494392	0.275709	0.739918
Serial (𝑚=16)	0.652483	0.398909	0.441177
Success	15/15	15/15	15/15