Evaluation of the quality of an image encrytion scheme

Osemwegie Omoruyi (Covenant University Ota)
Chinonso Okereke (Covenant University Ota)
Kennedy Okokpujie (Covenant University Ota)
Etinosa Noma-Osaghae (Covenant University Ota)
Obinna Okoyeigbo (Covenant University Ota)
Samuel John (Nigerian Defence Academy Kaduna)

TELKOMNIKA (Telecommunication Computing Electronics and Control)
Vol 17, No 6: December 2019

Encryption systems have been developed for image viewing applications using the Hill Cipher algorithm. This study aims to evaluate the image encryption quality of the Hill Cipher algorithm. Several traditional metrics are used to evaluate the quality of the encryption scheme. Three of such metrics have been selected for this study. These include, the Colour Histogram, the Maximum Deviation (comparing the original image) and the Entropy Analysis of the encrypted image. Encryption quality results from all three schemes using a variety of images show that a plain Hill Cipher approach gives a good result for all kinds of images but is more suited for colour dense images.