CONTROLLED PARAMETER MODULATIONS IN SECURE DIGITAL SIGNAL TRANSMISSIONS

We propose a simple method for secure digital signal transmission by making some modifications in the single-step parameter modulation technique propo sed earlier to overcome certain inherent deficiencies. In the modified method, the parameter modulation is effectively regulated or controlled by the chaotic signal obtained from the transmitting chaotic system so that it has the maximum security. Then, the same idea is also extended to the multistep parameter modulation technique. It is found that both the methods are secure against ciphertext (return map) and plaintex attacks. We have illustrated these methods by means of the Lorenz system.

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SECURE DIGITAL SIGNAL TRANSMISSION BY MULTISTEP PARAMETER MODULATION AND ALTERNATIVE DRIVING OF TRANSMITTER VARIABLES

International Journal of Bifurcation and Chaos ◽

10.1142/s021812740100319x ◽

2001 ◽

Vol 11 (07) ◽

pp. 2031-2036 ◽

Cited By ~ 14

Author(s):

P. PALANIYANDI ◽

M. LAKSHMANAN

Keyword(s):

Secure Communication ◽

Chaos Synchronization ◽

Lorenz System ◽

Signal Transmission ◽

Digital Signal ◽

Digital Signals ◽

Parameter Modulation ◽

Attractor Reconstruction ◽

Simple Mechanism ◽

The Lorenz System

The idea of secure communication of digital signals via chaos synchronization has been plagued by the possibility of attractor reconstruction by eavesdroppers as pointed out by Pérez and Cerdeira. In this Letter, we wish to present a very simple mechanism by which this problem can be overcome, wherein the signal is transmitted via a multistep parameter modulation combined with alternative driving of different transmitter variables, which makes the attractor reconstruction impossible. The method is illustrated by means of the Lorenz system and Chua's circuit as examples.

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Hidden Coexisting Attractors in a Chaotic System Without Equilibrium Point

International Journal of Bifurcation and Chaos ◽

10.1142/s0218127418300331 ◽

2018 ◽

Vol 28 (10) ◽

pp. 1830033 ◽

Cited By ~ 23

Author(s):

Wei Zhou ◽

Guangyi Wang ◽

Yiran Shen ◽

Fang Yuan ◽

Simin Yu

Keyword(s):

Equilibrium Point ◽

Chaotic System ◽

Dynamic Characteristics ◽

Three Dimensional ◽

Digital Signal ◽

Chaotic Signal ◽

Coexisting Attractors ◽

Pseudorandom Sequences ◽

The Lorenz System ◽

Chaotic Signal Generator

This paper proposes a new three-dimensional chaotic system with no equilibrium point but can generate hidden chaotic attractors. Dynamic characteristics of the system are analyzed in detail by theoretical analysis and simulating experiments, including hidden attractors, transient period and coexisting attractors. Different hidden coexisting attractors exist in this system, which shows abundant and complex dynamic characteristics and can be used to generate pseudorandom sequences for encryption fields. Besides, the presented system is realized by the digital signal processing (DSP) technology to construct a chaotic signal generator, whose statistical properties are tested by National Institute of Standards and Technology (NIST) software. The obtained results are better than that of the Lorenz system and imply the presented system can be used in the encrypted fields.

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A MODIFIED METHOD FOR THE ESTIMATION OF PREGNANETRIOL IN URINE

Journal of Endocrinology ◽

10.1677/joe.0.0200157 ◽

1960 ◽

Vol 20 (2) ◽

pp. 157-162 ◽

Cited By ~ 51

Author(s):

K. FOTHERBY ◽

D. N. LOVE

Keyword(s):

Simple Method ◽

Modified Method

SUMMARY A simple method modified from those developed by Stern [1957] and Bongiovanni & Eberlein [1958] for the estimation of pregnanetriol in urine is described. The accuracy, sensitivity, precision and specificity of the method are discussed.

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The chaotic masking message model using orthogonal functions

Transaction of Scientific Papers of the Novosibirsk State Technical University ◽

10.17212/2307-6879-2020-1-2-67-76 ◽

2020 ◽

pp. 67-76

Author(s):

Svetlana Belim ◽

◽

Sergei Belim ◽

Keyword(s):

White Noise ◽

Computer Experiment ◽

Digital Signal ◽

Chaotic Signal ◽

Noise Amplitude ◽

Trigonometric Functions ◽

Orthogonal Functions ◽

Lagrange Polynomials ◽

Useful Signal ◽

Orthogonal Property

The model for chaotic signal masking is proposed in the article. The digital signal in the bit representation is encoded using a family of orthogonal functions. Random white noise is superimposed on the resulting analog signal. The white noise amplitude is significantly greater than the amplitude of the signal. The functions orthogonal property is used to retrieve a useful signal. The advantage proposed this model is that it is not necessary to match the noise generators in the source and in the receiver of the message. The integration operation is required to retrieve the message. The using a simple rectangle scheme is discussed. The comparative computer experiment is based on two families of orthogonal functions: simple trigonometric functions and orthogonal Lagrange polynomials. It has been shown that using the trigonometric function family results in fewer errors when retrieving a message.

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Research and Analysis of Digital Baseband Transmission System Based on MATLAB

Journal of Secure Communication and System ◽

10.18063/jscs.v1i1.516 ◽

2018 ◽

Vol 1 (1) ◽

Author(s):

Chai Jianwen

Keyword(s):

Signal Transmission ◽

Digital Signal ◽

Transmission System ◽

Simulation Software ◽

Line Pattern ◽

Matlab Simulation ◽

Simulation Process ◽

Transmission Process ◽

Baseband Signal ◽

Digital Baseband

This paper mainly studies the basic concept of baseband transmission of digital signal and the transmission processof digital signal baseband transmission and how to design digital baseband transmission system with MATLABsoftware simulation. This paper fi rst introduces the theoretical basis of this subject, including digital communication,the composition of digital baseband transmission system and digital baseband signal transmission process. Then thepaper introduced the characteristics of digital baseband transmission system, including digital PAM signal powerdensity and common line pattern, and by comparing choosing the fi nal bipolar zero return code. Then we introducedthe MATLAB simulation software. The conditions of the best reception of the digital baseband signal are describedand how the waveform of the baseband signal is observed by an oscilloscope. Finally, according to the basic stepsof simulation process, the simulation process of digital baseband transmission system is realized by MATLABsimulation tool, and the system is analyzed.

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