Data security and privacy are considered to be the biggest problems faced by service
providers who have worked with public data for a long time. A key element of modern …

We study the structure of an S-box based on a fractional linear transformation applied on the
Galois field GF (2^ 8) GF (2 8). The algorithm followed is very simple and yields an S-box …

The nonlinear transformation concedes as S‐box which is responsible for the certainty of
contemporary block ciphers. Many kinds of S‐boxes are planned by various authors in the …

Recent study shows that substitution box (S-box) only cannot be reliably used in image
encryption techniques. We, in this paper, propose a novel and secure image encryption …

In block encryption algorithms the only nonlinear component, which creates confusion and
diffusion, is substitution box (S-Box). Therefore, carefully selection of S-Box is an important …

In the modern world, the security of the digital image is vital due to the frequent
communication of digital products over the open network. Accelerated advancement of …

The local ring-based cryptosystem is built upon the core mathematical operations of the
algebraic structure of local rings, which provides a significant advantage in ensuring security …

In this work, we will propose a new method for medical image encryption based on Vigenère
injection into two greatly improved Feistel rounds, followed by a chaotic mutation applied to …

Medical images contain very sensitive and confidential information about the patient and are
huge in terms of size. Therefore, there is a need to develop encryption schemes that reduce …

Securing medical images is a great challenge to protect medical privacy. An image
encryption model founded on a complex chaos‐based Pseudorandom Number Generator …