Title: A Comparative Study of Different Image Encryption and Decryption Techniques

Issue Number: Vol. 10, No. 1
Year of Publication: March - 2021
Page Numbers: 17-27
Authors: Yash Raj, Simriti Koul, Simran Koul
Journal Name: International Journal of Cyber-Security and Digital Forensics (IJCSDF)
- Hong Kong


Currently the digital communication generates millions of digital data in the form of digital images. These confidential images must be protected from intruders over transmission in network channels. Various Image Encryption techniques exist which make use of symmetric as well asymmetric cryptography algorithms to secure the digital media. In this paper, we present 4 different methods to perform Image Encryption – Elliptic Curve Cryptography (ECC) with Hill Cipher, ECC with Advanced Encryption Standard (AES), ECC using a mapping table, and ElGamal with Double Playfair Cipher. The algorithms are tested over both grayscale and RGB images. Comparisons are made through parameters like time taken for encryption and decryption, entropy of encrypted image, loss in intensity of decrypted image, Peak Signal to Noise Ratio (PSNR), Number of Pixels Change Rate (NPCR), and Unified Average Changing Intensity (UACI).