Extensive Analysis on Images Encryption using Hybrid Elliptic Curve Cryptosystem and Hill Cipher

The advancement of communication technology helps individual to share images through an Internet. However, the sharing through insecure channels may expose the images to certain attacks that will compromise their confidentiality. Image encryption is one of the methods used to protect against the confidentiality threat. A Hill Cipher has been applied in image encryption because of its simple operation and fast computation, but it also possesses a weak security level which requires the sender and receiver to use and share the same private key within an unsecure channel. Thus, there are many solutions been proposed in utilizing hybrid approach of Hill Cipher where one of them is Elliptic Curve Cryptosystem together with Hill Cipher (ECCHC) to utilize the beauty of Hill Cipher while managing its weaknesses. However, the ECCHC only been experimented over four images which leads to inaccuracy of the results. Thus, this study extended the experiments on 209 images from USC-SIPI database in order to investigate the efficiency of ECCHC. The result shows the ECCHC produces poor performances on security analysis on grayscale and RGB images, which then concludes it is not suitable to encrypt grayscale and RGB images.