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

Figure 8

The histogram of the tested greyscale images, in which the encrypted images are totally having a uniform distribution. (a) Boats. (b) Bridge. (c) Baboon. (d) Enc-Boats. (e) Enc-Bridge. (f) Enc-Baboon.

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(b)

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(f)