Spatiotemporal Chaotic Sequences Research Articles

Information Security of New Media Art Platform of Distributed System Based on Blockchain Technology

New media art is different from ready-made art, installation art, body art, and land art. New media art is a new art subject category with “optical” media and electronic media as the basic language. And, because of the continuous development of computer networks, distributed database management systems are becoming more and more popular. This article aims to study the information security control problem in the distributed new media system. Through comprehensive access control, reliable support, and many-to-many random mutual encryption, it solves the security requirements of supporting mobile computing in a distributed network environment, communication, and hierarchical grouping. Group key management and other issues have studied some key security technologies for building secure distributed information systems. This article proposes covering the behavior-based access control model ABAC (operation-based access control model), the architecture of the new Trusted Platform Module, the architecture of multithreaded crypto chips, and their service methods, as well as distributed information systems and key management solutions. Approximately obeying the chi-square distribution with 2 degrees of freedom, when the significance level is taken as 5%, the chi-square value for the skin is 5.99. Different initial values are selected for the chaotic sequence, 200 groups of chaotic sequences with a length of 2000 are selected for sequence inspection, and the pass rate is 97.5%. It can be seen that the autocorrelation and cross-correlation characteristics of the improved spatiotemporal chaotic sequence are still relatively ideal, so the usability of the platform is relatively high.

An encryption algorithm for user's sensitive information resources in network database

At present, the encryption process of simple one-dimensional chaotic system has limitations, which leads to the poor security of sensitive information in the network database. To solve this problem, in this paper, a secondary encryption algorithm based on NCA mapping was proposed for user’s information resource with spatio-temporal chaotic. By using the sensitivity, scrambling and randomness characteristics of initial value in dual chaotic system which was based on Logistic mapping combined with Henon mapping, the algorithm was applied to the generation of key, to make double encryption of plaintext. The dual chaotic system which combined Logistic mapping and Henon mapping was improved, and a new spatio-temporal chaotic system based on NCA mapping was constructed. NCA mapping was used to control the scrambling process of sensitive information, and the spatio-temporal chaotic sequence was used to change the diffusion process of sensitive information, to complete the encryption of user’s sensitive information resource in network database. The experimental results show that the proposed algorithm can effectively encrypt sensitive information and improve the security of network database operation.

Chaotic image cryptosystem using DNA deletion and DNA insertion

By combining chaotic system and DNA sequence operations, an image cryptosystem is proposed. To generate sequences with better chaotic characteristics, a new spatiotemporal chaotic system is constructed by employing the Logistic-Sine system (LSS) in the coupled map lattice (CML). In the cryptosystem, the original image is firstly diffused through exclusive or with a key image transformed from the constructed spatiotemporal chaotic sequences. Furthermore, DNA deletion and DNA insertion pseudo-operations are used to confuse the DNA-encoded diffused image under the control of the key streams. The encrypted image is obtained after decoding the confused DNA image. Experimental results and performance analysis demonstrate that the proposed image cryptosystem has acceptable speed, good robustness and outperforms some existing image encryption schemes to counteract the recognized attacks.

An image encryption scheme based on new spatiotemporal chaos

Spatiotemporal chaos is chaotic dynamics in spatially extended system, which has attracted much attention in the image encryption field. The spatiotemporal chaos is often created by local nonlinearity dynamics and spatial diffusion, and modeled by coupled map lattices (CML). This paper introduces a new spatiotemporal chaotic system by defining the local nonlinear map in the CML with the nonlinear chaotic algorithm (NCA) chaotic map, and proposes an image encryption scheme with the permutation-diffusion mechanism based on these chaotic maps. The encryption algorithm diffuses the plain image with the bitwise XOR operation between itself pixels, and uses the chaotic sequence generated by the NCA map to permute the pixels of the resulting image. Finally, the constructed spatiotemporal chaotic sequence is employed to diffuse the shuffled image. The experiments demonstrate that the proposed encryption scheme is of high key sensitivity and large key space. In addition, the scheme is secure enough to resist the brute-force attack, entropy attack, differential attack, chosen-plaintext attack, known-plaintext attack and statistical attack.

Design and implementation of video encryption based on spatiotemporal chaotic sequences

Concerning the characteristics of big data flow, high real-time requirement, a generator on encrypted keys, which was analyzed in detail by maximal lyapunov exponent, was proposed, approximate entropy and L-Z complexity by means of controllable spatiotemporal chaotic sequences combined with the encrypted method of encryption flow based on XOR algorithm. The experimental results show that the encrypted system has high performance at two aspects: both statistics and strengthened sensibility.

ON GENERATING BINARY SPATIOTEMPORAL CHAOTIC SEQUENCES AND ITS APPLICATION ON SPREAD-SPECTRUM COMMUNICATIONS

A code generator is designed based on a one-way coupled map lattice (OCML) system, and application of the generated binary spatiotemporal chaotic sequences on baseband spread spectrum communication is investigated. Random characters and the correlation properties of quantized signals are discussed, and error performance in communication is analyzed. It is shown that these sequences not only possess extremely high security in comparison with both conventional sequences and earlier chaotic communication schemes, but also show good performance on the Bit Error Rate (BER). The system also has the advantages of fast code generating speed and ease of synchronization, and is capable of supplying large amount of sequences.

Correlation properties of binary spatiotemporal chaotic sequences and their application to multiple access communication.

This paper studies the correlation property and the spectral density of the binary spatiotemporal chaotic sequences that are generated by the one-way coupled map lattice. The results show that this kind of chaotic sequences possesses excellent randomlike property and could be used directly in the spread spectrum multiple access (SSMA) communications. The multiple access interference in the additional white Gaussian noise background is then analyzed, and the corresponding formulas are presented. The simulation and computation results indicate that the communication system adopting such spreading sequences possesses as good performance as the one employing Gold sequences. But the former has larger capacity and higher complexity. Therefore, the binary spatiotemporal chaotic sequences are good candidates for the spreading sequences in SSMA communications.