A Novel Plaintext-Related Image Encryption Algorithm Based on Stochastic Signal Insertion and Block Swapping

Abstract

Image encryption is an important method for protecting private data during communication. This paper proposes a novel hyperchaotic image encryption algorithm based on stochastic signal insertion and block permutation. First, the 5D hyperchaotic system is applied to generate pseudorandom number sequences. The SHA-256 hash function and secret keys are used to produce the initial values of the cryptosystem. The hash values can effectively enhance the sensitivity to plain image. To enlarge the key space and change orbit of cryptosystem, some stochastic signals are inserted during iteration. The plain image is equally divided into two parts. An X-coordinate, a Y-coordinate and a control table are established with produced pseudonumber sequences. The pixel is swapped with another pixel in the current block or another block depending on the control table. Cyclic shift is performed during the diffusion process. Performance and security analyses are executed to verify the effect of the proposed scheme. It is clear that the proposed scheme has a large key space and is highly sensitive to plain image and secret keys. Moreover, the cryptosystem has low computation complexity and can resist correlation analysis, entropy analysis, statistical attack, differential attack, noise and data loss attacks.

Robust Image Encryption With Scanning Technology, the El-Gamal Algorithm and Chaos Theory

“…Chi-square analysis can also be used to measure the histogram uniformity. The chi-square definition is described as follows [27], [38]: where and denote the observed and expected frequencies, respectively. The ideal theoretical value for 2 is 293.25 for 255 degrees of freedom and a significance level of 0.05.…”

“…This subsection is devoted to explaining the immunity of the proposed approach to specific kinds of important attacks. Occlusion is the first attack on the images, which greatly affects the decrypted image at the receptor [27], [28], [44]. Different sized blocks are removed from the Peppers encrypted image (Fig.…”

“…Secret keys are generated in this technique by employing a new 3D chaotic map, and then these keys are permutated with the blocks to obtain the encrypted image. In [27], a five-dimensional hyper chaotic system is implemented to produce pseudo random sequences. The initial values of the algorithm are generated via secret keys and a hash function.…”

Novel Image Encryption Using a Pseudoset Generated by Chaotic Permutation Multicircular Shrinking With a Gradual Deletion of the Input Set

“…Suryanto [33] 392.00 MATLAB 8.5, Intel (R) core(TM) i7-5500U CPU @2.4 GH, RAM 8 GB Windows 10, 64 bit. Tong [14] 181.00 Unspecified The speed of the encryption and decryption processes is influenced by the complexity of the cryptographic algorithm used [44]. In general, the lower the complexity of the algorithm is, the faster the encryption and decryption processes.…”

A new secure image encryption algorithm based on a 5D hyperchaotic map

“…Liu and Kadir [ 22 ] proposed color image encryption using bit-level permutations and a high-dimensional chaotic system. Sun et al [ 23 , 24 ] proposed a novel hyperchaotic image encryption method. Since a 5-D hyperchaotic system [ 25 ] has three positive Lyapunov exponents and generates more complex dynamic behavior than a low-dimensional system, we also adopt a 5-D hyperchaotic system to generate chaotic sequences in this paper.…”