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

Figure 13

Noise attack, with the first row denoting the defective cipher images by varying Salt & Pepper noise density and the last row signifying the corresponding deciphered ones. (a) Density = 0.01. (b) Density = 0.15. (c) Density = 0.25.

(a)

(b)

(c)