Image Encryption: A Communication Perspective by Fathi E. Abd El-Samie, Hossam Eldin H. Ahmed, Ibrahim F.

By Fathi E. Abd El-Samie, Hossam Eldin H. Ahmed, Ibrahim F. Elashry, Mai H. Shahieen, Osama S. Faragallah, El-Sayed M. El-Rabaie, Saleh A. Alshebeili

Presenting encryption algorithms with assorted features, Image Encryption: A conversation Perspective examines picture encryption algorithms for the aim of safe instant conversation. It considers instructions for picture encryption: permutation-based approaches and substitution-based approaches.

Covering the spectrum of photograph encryption rules and methods, the e-book compares snapshot encryption with permutation- and diffusion-based techniques. It explores quantity theory-based encryption algorithms corresponding to the knowledge Encryption typical, the complex Encryption regular, and the RC6 algorithms. It not just info the power of assorted encryption algorithms, but in addition describes their skill to paintings in the barriers of instant verbal exchange systems.

Since a few ciphers weren't designed for snapshot encryption, the ebook explains the best way to adjust those ciphers to paintings for photograph encryption. It additionally offers guide on the right way to look for different ways appropriate for this activity. To make this paintings finished, the authors discover conversation options focusing on the orthogonal frequency department multiplexing (OFDM) method and current a simplified version for the OFDM verbal exchange procedure with its various implementations.

Complete with simulation experiments and MATLAB® codes for many of the simulation experiments, this e-book may help you achieve the knowledge required to pick the encryption process that most sensible fulfills your software requisites.

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1 Overview This chapter presents a new image cryptosystem. This system is based on homomorphic image processing, which has evolved primarily as a tool of image enhancement for images captured in bad lighting conditions. The main idea of homomorphic image processing is based on modeling the image as a product of constant illumination and varying reflectance. The product is dealt with as a summation using the logarithmic operation. The reflectance component can be separated using a high-pass filter, while the illumination component is separated using a low-pass filter.

It begins by e­ ncrypting the IV. The bits of the encrypted IV are XORed with the corresponding bits of the first plaintext block to obtain the corresponding ciphertext block. Also, the output of the encryption algorithm is used as an input to the next encryption step instead of the IV. 15 Using a block cipher in the CFB mode. 16 Using a block cipher in the OFB mode. continues until the last block. Changing the IV for the same ­plaintext block results in different ciphertext blocks. 16 shows the OFB mode [16–18,49,50].

The correlation coefficient of −1 means that the cipherimage is the reverse of the plainimage, which is totally true. The rest of the results, including the histogram uniformity, have judged the bad performance of the Caesar cipher correctly. For the diffusion tests, the results are almost zero because the Caesar cipher does not possess any diffusion characteristics. For the second case, 1. The histogram deviation, again, could not judge the ­encryption performance correctly because the plainimage has a localized histogram.

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