Table 7. Entropy values for the original and encrypted images for different images

Image	Entropy
Image	Original image	Encrypted image
Lena	7.426985	7.997118
Airport	6.690835	7.997248
Chemical plant	7.169468	7.996899
Walter Cronkite	7.206486	7.997322
Toy Vehicle	6.141587	7.997055