Table 7 Global and local entropy analysis.

Sample images

Original image entropy

cipher image global entropy

Local entropy No. of blocks 30

Local entropy critical values

H^5%left = 7.9019

H^5%right = 7.9030

H^10%left = 7.9017

H^10%right = 7.9032

H^1%left = 7.9015

H^1%right = 7.9034