Cryptanalysis of an Image Encryption Algorithm Based on Combined Chaos for a BAN System, and Improved Scheme Using SHA-512 and Hyperchaos

Abstract

The issues of identity authentication and privacy protection of individuals in body area network (BAN) systems have raised much concern in past few years. To address the challenges of privacy protection in wireless BAN, an image encryption algorithm has been proposed recently by Wang et al. The encryption algorithm utilized two 1D chaotic maps to generate sub-chaotic matrices which are combined to perform encryption. The algorithm has good statistical encryption performance. However, a cautious inquiry finds that it has some underlying security defects. This paper evaluates the security of the Wang et al. encryption algorithm to show that it is totally breakable under proposed cryptanalysis and hence infeasible for privacy protection in BAN. It has been shown that the plain-image data can be recovered without any prior knowledge of secret key and plain-text. Furthermore, this paper also suggests an improved encryption scheme using secure hash algorithm SHA-512 for one-time keys and a 4D hyperchaotic system to subdue the security insufficiencies of the algorithm under study. The simulation results and analysis demonstrate that the improved image encryption scheme has excellent encryption quality, plain-image sensitivity, and resistance to possible cryptanalytic attacks.

Cryptanalysis and Improvement on an Image Encryption Algorithm Design Using a Novel Chaos Based S-Box

“…The results for the Lena image is listed in Table 2. Evidently, the encrypted image using our improved encryption scheme has smaller absolute values of correlation coefficient than the schemes in [2,15,23,24].…”

“…The image encryption scheme in Reference [21] was broken by Zhu and Sun [22]. The image encryption scheme in Reference [23] was broken by Ahmad et al [24]. In order to promote cryptanalysis research and enhance the security of image encryption systems, this article analyzes the image encryption algorithm using chaos S-boxes in Reference [15].…”

Multiple-Image Encryption Algorithm Based on the 3D Permutation Model and Chaotic System

“…In the Introduction, References are related to image encryption. However, the algorithms in References [1][2][3][4][5][6][7][8] are single-image encryption algorithms, which cannot encrypt multiple images at once. However, References [7,8] adopt the classical substitution-permutation network, which are similar to the proposed algorithm.…”

“…Gan et al proposed an image encryption algorithm using S-boxes and a chaotic system [4]. Ahmad et al presented an image encryption algorithm using SHA-512 and hyper-chaos [5]. Bashir et al presented an image encryption algorithm with Lv's hyper-chaotic system [6].…”

When an attacker meets a cipher-image in 2018: A year in review

“…chaos synchronization [28,29]. As the opposite of image cryptography, some impressive image cryptanalysis works were developed in 2018 [30,31,32,33,34,35]. Especially, all image encryption schemes published in the journal Nonlinear Dynamics before 2018 are critically reviewed in [35].…”