共查询到20条相似文献,搜索用时 22 毫秒
1.
2.
This paper is devoted to introduce a novel complex fifth-order memristive circuit system and its applications in synchronous stability and weak signal detection. Firstly, the typical dynamical behaviors of the memristive system are discussed by chaotic phase portrait, complexity analysis, one-parameter bifurcation and Lyapunov exponent spectrum. Secondly, the adaptive control method is applied to realize the synchronization between the drive memristive system (DMS) and the response memristive system (RMS). The results indicate that the synchronization method has strong robustness and anti-interference ability. Thirdly, the weak signal detection of the novel five-dimensional memristive system is realized by using the extreme sensitivity of chaotic system to initial values. Finally, the fifth-order memristive circuit is designed by using basic electronic elements and simulated by Multisim software. And the anti-interference ability and sensitivity of the fifth-order memristive circuit are further verified by adding different weak disturbance signals at different positions of the circuit. 相似文献
4.
As the low complexity of low-dimensional chaotic system and the slow speed of image encryption, this paper proposes a fast encryption algorithm of color image based on four-dimensional chaotic system. Firstly, we propose a new method of designing four-dimensional chaotic system based on the classical equations of three-dimensional chaotic system, to increase the complexity and key space of the encryption algorithm. Secondly, according to the nature of color images’ pixels channel, we design a new pseudo-random sequence generator and reuse the random sequence, to improve the speed of image encryption. Finally, the methods of row-major and column-major are used to diffuse the original image and the cat map with parameter is used to scramble the image pixels, respectively, to achieve the effect of encryption. The results of simulation and security analysis show that the proposed encryption algorithm is of good performance on security, robustness and high encryption speed. 相似文献
5.
为了解决传统密码系统由于对称特性导致的安全性低的问题,提出了一种新的基于柱面衍射和彩色空间转换的单通道彩色图像加密方法。在加密过程中,首先将彩色图像变换为YCbCr4:2:0格式的单通道图像,然后经过两次柱面衍射和相位截断操作对图像进行加密。在解密过程中,将密钥与密文结合,经过两次柱面逆衍射后重建出彩色原图。由于柱面衍射过程是一个非对称的过程,此算法可以克服基于平面衍射的加密系统的对称特性,将其应用到基于相位截断的加密系统中可以进一步有效提高加密系统的安全性。仿真结果表明,该算法能够有效地对彩色图像进行单通道加密,不仅可以高质量地恢复原始彩色图像,而且加密系统具有较高的安全性。 相似文献
6.
In this paper, a new color image encryption scheme based on DNA operations and spatiotemporal chaotic system is presented. Firstly, to hide the distribution information of the plain image, we convert the plain image into three DNA matrices based on the DNA random encoding rules. Then, the DNA matrices are combined into a new matrix and is permutated by a scramble matrix generated by mixed linear-nonlinear coupled map lattices (MLNCML) system. In which, the key streams are associated with the secret keys and plain image, which can ensure our cryptosystem plain-image-dependent and improve the ability to resist known-plaintext or chosen-plaintext attacks. Thereafter, to resist statistical attacks, the scrambled matrix is decomposed into three matrices and diffused by DNA deletion-insertion operations. Finally, the three matrices are decoded based on DNA random decoding rules and recombined to three channels of the cipher image. Simulation results demonstrate that the proposed image cryptosystem has good security and can resist various potential attacks. 相似文献
7.
随着多媒体技术的不断发展,视频信息安全愈发受到人们的关注。为解决视频信息的安全问题,提出了一种基于现场可编程门阵列(FPGA)技术的超混沌视频加密方法。在加密过程中,一方面FPGA控制数字摄像头实现实时彩色视频信息的采集;另一方面,在计算机密钥指令下,利用FPGA使超混沌系统产生有效的伪随机序列,实现对所采集视频信息的数据和地址的双重超混沌加密。给出了具体的超混沌视频加密算法和设计流程以及FPGA实现结果。安全性分析表明,明密文主观视觉对比显著不同,密钥空间大,视频图像统计特性的相关性弱,说明基于FPGA的超混沌视频加密系统加密效果良好可靠。 相似文献
8.
Padmapriya Praveenkumar Rengarajan Amirtharajan Karuppuswamy Thenmozhi John Bosco Balaguru Rayappan 《Telecommunication Systems》2017,65(1):65-78
Recently, the development of confidentiality and authenticity ensured by image encryption has been one of the key advancements in the field of secured wireless communication. The proposed work focuses on providing confusion, diffusion and permutation inherently in the system. The input grayscale image is shuffled by employing the Henon algorithm and subsequently separated into 8 bit planes. With the aid of a secret key of 256 bits, chaotic sequences are generated for each bit plane. Later, the logistic map is adapted on the chaotic sequences to obtain the scrambled image. Furthermore, this image is shuffled with Zaslavskii and Hilbert Space Filling Curve algorithms, which establishes the confusion stage. To incorporate the diffusion stage, a self-invertible matrix is generated by a latin square image cipher and a secret key. This matrix and the scrambled image underwent the Hill cipher to build the encrypted image followed by a row-column transformation to ensure multifold security. The proposed compound activities of encryption are successfully implemented on the laboratory virtual instrumentation engineering workbench 2013 platform. Noticeably, the established processes of image encryption are tested in the universal software radio peripheral environment and transceived via an additive white Gaussian noise (AWGN) channel. More specifically, the influence of natural and unnatural (cropping attack) noise on the characteristics of the encrypted image while sharing through AWGN channel has been investigated. Security analysis is performed by computing the unified average changing intensity, number of pixels change rate, correlation value, large key space to defy brute force attack, strong key sensitivity and uniform gray value distribution on encryption. 相似文献
9.
10.
11.
12.
Liu Jizhao Tang Shusen Lian Jing Ma Yide Zhang Xinguo 《Multidimensional Systems and Signal Processing》2019,30(4):1637-1657
Multidimensional Systems and Signal Processing - Today, medical imaging suffers from serious issues such as malicious tampering and privacy leakage. Encryption is an effective way to protect these... 相似文献
13.
随着各种抄板技术和芯片解剖技术的发展,嵌入式系统芯片正面临着越来越多受攻击风险,如何保护嵌入式系统产品不受非法复制,正日益受到人们的关注,各种防复制方法也应运而生。由此设计了一款软硬件协同的新型防复制电路及系统,用以实现对嵌入式软件版权的保护。防复制电路采用AES加密算法与嵌入式芯片进行多次随机动态加密验证,使破解者无法通过监控通信数据来破解验证保护。防复制电路中内置CPU和安全存储器,用来存储关键数据以及执行部分嵌入式程序,让破解者无法获得嵌入式芯片中完整的程序,从软硬件两方面实现了对嵌入式产品版权的充分保护。本电路在FPGA上进行了实现,并搭建被保护芯片与防复制FPGA电路的联合保护系统,实测结果显示该系统很好的完成了防复制的功能,未通过动态加密验证无法启动系统,此外,没有防复制电路的配合,无法执行完整的嵌入式芯片中的程序。 相似文献
14.
15.
Compared with general chaotic systems, a linear hyperbolic chaotic system of partial differential equations with nonlinear boundary conditions has larger parameter space, stronger sensitivity to initial condition and control parameter, better random-like behavior and so on, but it has not been employed in cryptography so far. Then using its significant properties, we present a new cryptosystem with coupled map lattices and time-varying delay. The proposed image encryption algorithm with permutation–diffusion architecture can overcome some drawbacks in the existing methods, because the sum of pixel value of original image is used for determining the permutation parameters and the previous cipher image information is utilized in the next diffusion. Theoretical analysis and computer experiments confirm that the new algorithm is efficient, practicable, and reliable, with high potential to be adopted for network security and secure communications. 相似文献
16.
《AEUE-International Journal of Electronics and Communications》2014,68(4):361-368
As to color image encryption, most of the previous algorithms are to encrypt its R, G, B components, respectively, which neglected the correlations among R, G, B components. To overcome this problem, a type of chaotic color encryption scheme was proposed by Wang et al. based on combined permutation and combined diffusion. Unfortunately, there are some drawbacks in the scheme and it has been cryptanalyzed soon. To strength the security performance, a new scheme based on coupled logistic map, self-adaptive permutation, S8 S-boxes transform and combined global diffusion is proposed in this paper. Simulation results and analyses show that our cryptosystem is immune to some well-known attacks and has high security for practical color image encryption applications. 相似文献
17.
18.
为重点研究线性自调频系统的动力学行为,根据锁相环的结构提出了一种新的线性自反馈调频系统,通过对线性自调频系统数学模型的分析,其动力学行为可以用简单的正弦映射描述。文章通过相空间轨迹、分岔图和Lyapunov指数研究正弦映射中的动力学行为和混沌现象,发现其动力学行为具有周期性和对称性的特点。同时分析对比了自调频混沌系统在不同状态下的频谱,为进一步研究自调频混沌信号源的设计和应用提供理论依据和数值参考。 相似文献
19.
针对采用三电极电化学葡萄糖传感器的血糖检测应用,提出了一种新型低功率、低噪声的紧凑式电流测量电路结构。该电路包含一个阈值电压基准电流源结构,能够为电化学反应提供所需的基准电压,并且能够将反应电流转换为响应的电压。采用0.35 μm CMOS工艺进行了具体实现,面积为125 μm×340 μm。采用三电极电化学葡萄糖传感器进行了具体测量,实验结果表明了提出电路的可行性,其功率损耗为0.891mW,产生的噪声为0.73mVrms,适用于便携式电化学血糖检测设备。 相似文献