Abstract
Recently, massive research works have been accomplished for augmenting privacy and security requirements for cybersecurity applications in wireless communication networks. This is attributed to the fact that conventional security processes are not appropriate for robust, efficient, and reliable multimedia streaming over unsecure media. Therefore, this paper presents an efficient color image cryptosystem based on RC6 with different modes of operation. The proposed cryptosystem is composed of two phases: encryption and decryption. The encryption phase starts by decomposing the color plainimage with few details into its RGB components, which in turn, are segmented into 128-bit blocks. These blocks are then enciphered using RC6 with an appropriate mode of operation. After that, the corresponding enciphered blocks of RGB components are multiplexed for constructing the final cipherimage. This scenario is reversed in the decryption phase. The performance of the proposed cryptosystem is gauged via simulation using a set of encryption quality metrics. The simulation results reveal that the proposed cryptosystem with cipher block chaining (CBC), cipher feedback (CFB), and output feedback (OFB) modes can efficiently and effectively hide all information of the color images with few details even in the presence of some input blocks with similar data. On the other hand, the results show that the electronic codebook (ECB) mode is not effective at all in hiding all details of images. Finally, the obtained results ensure the applicability of the proposed cryptosystem and its efficiency in encrypting images in terms of security, encryption quality, and noise immunity.
Highlights
In recent years, information privacy and security have played an essential role in our daily and modern cybersecurity applications
The results show that the proposed cryptosystem with cipher block chaining (CBC), cipher feedback (CFB), and output feedback (OFB) modes can effectively encrypt the color images with few details and hide their features
A simulation model has been built to assess the performance of the proposed color image cryptosystem with different operation modes using various encryption quality metrics
Summary
Information privacy and security have played an essential role in our daily and modern cybersecurity applications. The only related research was given in [25], which introduced a cryptosystem for enciphering of gray-scale images with few details This cryptosystem is constructed using wavelet fusion as a pre-processing operation on the images before encryption aiming to hide the flat patterns. The application of encryption techniques with different modes of operation (ECB, CBC, CFB, and OFB) for encrypting normal gray-scale digital images reveals improvement in the encryption quality [19] Such results encouraged us to apply the RC6 with different modes of operation to encrypt color images with few details, which cannot be encrypted efficiently with traditional RC6 or other encryption techniques.
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