Securing Digital Images through Simple Permutation-Substitution Mechanism in Cloud-Based Smart City Environment

Table 6

values of the experimented greyscale images.

Image	Chi-square value	Result
Boats	383969.687	Nonuniform
Bridge	1185618.347	Nonuniform
Baboon	187692.171	Nonuniform
Enc-boats	277.561	Uniform
Enc-bridge	263.324	Uniform
Enc-baboon	286.876	Uniform