Effect on Reconstruction of Images by Applying Fractal Based Lossy Compression Followed by Symmetrical Encryption Techniques
Neetu Gupta, Ritu Vijay · 2020
Compression and encryption are two major aspects of cryptanalysis. Compression reduces the large bandwidth requirement while encryption provides security against differential unethical attacks during transmission of images over a channel. The fractal based compression algorithm is proposed to remove the redundant data as it makes the image resolution independent. Here, AES and DES symmetrical encryption techniques are used over compressed images. The efficiency of proposed compression technique is evaluated by performance evaluation parameters like PSNR, MSE and SSIM. The effects on these performance evaluation parameters, when symmetrical encryption techniques are imposed on compressed images, are also analysed. The capacity of encryption techniques to procure the information from differential attacks is also analysed by calculation of differential parameters like NPCR and UACI. This experiment is performed on standard set of five grayscale test images. This paper shows that fractal-DES cryptanalysis system uses minimum bandwidth during transmission and provides better security and efficient reconstruction of images over fractal-AES cryptanalysis system.