Table 8.

Correlation coefficients between adjacent elements of original image and encrypted image.

Images	Horizontal	Vertical	Diagonal
Plaintext “Rice”	0.9427	0.9263	0.8994
Cyphertext “Rice”	−0.0046	0.0287	−0.0361
Plaintext “Cameraman”	0.9588	0.9360	0.9095
Cypher “Cameraman”	−0.0017	−0.0279	0.0047
Plaintext “autumn”	0.9675	0.9845	0.9821
Cyphertext “autumn”	−0.0087	0.0142	0.0098
Plaintext “pepper”	0.9894	0.9931	0.9847
Cyphertext “pepper”	−0.0055	−0.0194	−0.0295