A compression-diffusion-permutation strategy for securing image

Wang

Sun

2018

This paper presents an improved cryptanalysis of a chaos-based image encryption scheme, which integrated permutation, diffusion, and linear transformation process. It was found that the equivalent key streams and all the unknown parameters of the cryptosystem can be recovered by our chosen-plaintext attack algorithm. Both a theoretical analysis and an experimental validation are given in detail. Based on the analysis of the defects in the original cryptosystem, an improved color image encryption scheme was further developed. By using an image content–related approach in generating diffusion arrays and the process of interweaving diffusion and confusion, the security of the cryptosystem was enhanced. The experimental results and security analysis demonstrate the security superiority of the improved cryptosystem.

Section: Examples Of the Improved Cryptanalysis Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improved Cryptanalysis and Enhancements of an Image Encryption Scheme Using Combined 1D Chaotic Maps

Wang

Sun

2018

“…Accordingly, the security issues of digital images have become increasingly critical. Traditional data encryption algorithms [ 1 ], such as RSA, Data Encryption Standard (DES), and Advanced Encryption Standard (AES), however, are not suitable for image encryption because of their large data capacity and the strong correlation between pixel points. Therefore, researchers have begun to look for new solutions for image encryption [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

A Dynamic DNA Color Image Encryption Method Based on SHA-512

Zhou

Kasabov

2020

This paper presents a dynamic deoxyribonucleic acid (DNA) image encryption based on Secure Hash Algorithm-512 (SHA-512), having the structure of two rounds of permutation–diffusion, by employing two chaotic systems, dynamic DNA coding, DNA sequencing operations, and conditional shifting. We employed the SHA-512 algorithm to generate a 512-bit hash value and later utilized this value with the natural DNA sequence to calculate the initial values for the chaotic systems and the eight intermittent parameters. We implemented a two-dimensional rectangular transform (2D-RT) on the permutation. We used four-wing chaotic systems and Lorentz systems to generate chaotic sequences and recombined three channel matrices and chaotic matrices with intermittent parameters. We calculated hamming distances of DNA matrices, updated the initial values of two chaotic systems, and generated the corresponding chaotic matrices to complete the diffusion operation. After diffusion, we decoded and decomposed the DNA matrices, and then scrambled and merged these matrices into an encrypted image. According to experiments, the encryption method in this paper not only was able to withstand statistical attacks, plaintext attacks, brute-force attacks, and a host of other attacks, but also could reduce the complexity of the algorithm because it adopted DNA sequencing operations that were different from traditional DNA sequencing operations.

“…In Ref. [ 22 , 25 , 26 , 27 , 28 , 29 ], authors put forward some novel image diffusion algorithm. In Ref.…”

Section: Introductionmentioning

confidence: 99%

A Secure and Fast Image Encryption Scheme Based on Double Chaotic S-Boxes

Wang

2019

109

In order to improve the security and efficiency of image encryption systems comprehensively, a novel chaotic S-box based image encryption scheme is proposed. Firstly, a new compound chaotic system, Sine-Tent map, is proposed to widen the chaotic range and improve the chaotic performance of 1D discrete chaotic maps. As a result, the new compound chaotic system is more suitable for cryptosystem. Secondly, an efficient and simple method for generating S-boxes is proposed, which can greatly improve the efficiency of S-box production. Thirdly, a novel double S-box based image encryption algorithm is proposed. By introducing equivalent key sequences {r, t} related with image ciphertext, the proposed cryptosystem can resist the four classical types of attacks, which is an advantage over other S-box based encryption schemes. Furthermore, it enhanced the resistance of the system to differential analysis attack by two rounds of forward and backward confusion-diffusion operation with double S-boxes. The simulation results and security analysis verify the effectiveness of the proposed scheme. The new scheme has obvious efficiency advantages, which means that it has better application potential in real-time image encryption.Entropy 2019, 21, 790 2 of 20 (or shuffling, scrambling) process plays a role in confusing the relationship between the cipher image and plain image. The function of the diffusion process is to spread the change of one pixel value in the plain image to the whole range of the cipher image. Based on the basic confusion-diffusion architecture, researchers have proposed many novel concrete encryption strategies. In Ref. [18][19][20][21][22][23][24], authors proposed some different permutation strategies for image scrambling aiming at the confusion process. In Ref. [22,[25][26][27][28][29], authors put forward some novel image diffusion algorithm. In Ref. [30][31][32][33][34][35][36], authors adopt new chaotic systems to improve the complexity and randomness of chaotic key streams. Some other cryptographic methods have also been tried by many researchers. For example, some cryptographic algorithms are based on bit-level permutation and diffusion [30], and some algorithms introduce the DNA coding mechanism [37], and some algorithms mainly use S-box to encrypt images [38][39][40]. However, some image encryption schemes exist as obvious security vulnerabilities. Thus, these image encryption schemes cannot resist some attacks, such as the chosen/known plaintext. In addition, some image encryption algorithms are inefficient, such as using bit-level image scrambling, DNA encoding mechanism, key related to plaintext Hash value [41,42], and the high-dimensional chaotic system [43,44]. Encryption algorithms with low efficiency are not suitable for some resource-constrained environments, such as mobile social network [45], sensor network communication environment [46] and searchable encryption [47]. Compared with high-dimensional continuous-time chaotic systems, low-dimensional discrete chaotic systems can generate chaot...