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With the development of networking and communications technology, data transmission has penetrated into all aspects of life. Such information security has become a problem we have to consider about, Secure transmission of data has become an important indicator of the exchange of information. As the chaotic system has good encryption features, so this paper describes a method of digital encryption...
It has been proved that Local-Period phenomena widely exsit in any chaotic binary sequence. Among the reasons of Local-Period phenomena existing, quantifications of chaotic binary random numnber generators are the key factor. This paper proposed that different quantifications could make sequences have different randomness from the same chaotic real-value seqence. The simulation results illustrated...
This article proposes a new design scheme and hardware implementation of encryption system based on Wi-Fi technology. This system uses a digital chaotic encryption core based on FPGA. The initial key generated by Logistic digital sequence can be used to output stream cipher, by which the plaintexts are encrypted. Then the scheme realizes a safe and reliable information transmission by Wi-Fi module...
There may be some disagreements to use chaos in application, for its characteristics are not very clear when applying them in real application. Chaos is generally characterized as a nonlinear, deterministic phenomenon. For a common type of chaotic systems, this paper introduces equivalent descriptions in the form of random process with a study research of different random distributions inputs. Such...
As digital chaos is affected by the limited precision of computer, chaotic sequence properties present short periodicity. For the phenomenon of digital chaos, the paper analyzes similar-short periodicity of digital chaos and puts forward a novel generator of digital chaos key sequence. Meanwhile, we detail the DCT (Discrete Cosine Transformation) compression and Wavelet compression method, and then...
The concepts of chaotic quasi-random variables and chaotic quasi-random process are proposed in this paper. The study focuses on viewing from a new viewpoint to descript chaotic signal generated by Logistic mapping for communication. We find that although chaos has essential difference from random, it also can be seen by a new view to some extent. This paper shows the probability, with theoretical...
To enhance the complexity of the chaos, improve the characteristics of chaos, and increase the number of chaotic types, a simple method is put forward in this paper. This method does not need to change the existing chaotic system, but just makes a nonlinear transformation to the chaotic signal by a unary polynomial. The nonlinear transformation has the characteristic that its physical circuit is easy...
Due to extensive research of non-linear science theory (the chaos) in the image encryption, we find especially that the properties of chaos make itself particularly suitable for image encryption. On the basis of many excellent features of chaotic sequence, combining application of chaotic theory in cryptography, the paper puts forward image encryption based on chaotic binary sequence. On Logistic...
This paper introduces some results of our researches on Lorenz-based secure communication in time and frequency domains. These researches are focused on the characteristics of Lorenz system and processing it for its application in secure communication. In this paper, it gives the processing methods for Lorenz system, that is, filtering and frequency domain truncation method for test. Then, it also...
This paper proposes a new scheme design and hardware implementation of wireless transmission system based on FPGA and chaotic encryption with A5/1 algorithm. This design uses FPGA chip as the encryption core, in which Logistic system generates the initial key and encrypts the plaintext combined with A5/1 algorithm, then it uses SIM300 module to realize wireless transmission. Develop two test boards...
Chaotic special properties make the chaotic encryption technology to be an important research field of information science and technology. However, as digital chaos is affected by the limited precision of computer, chaos system properties present degradation--short periodicity of output sequence. This paper proposes K-L transform method for Logistic 0/1 sequence, and then analyses time-autocorrelation,...
Lorenz system generates the chaotic signal with marked features in both time and frequency domains. Such disadvantages are not benefit for its applications in chaotic masking secure communication. To overcome such defects, this paper introduces a frequency domain truncation method for Lorenz-based chaotic masking secure communication. The main work focuses on the parameter test of this frequency truncation...
In chaos secure communication system, to separate effectively chaos and harmonic signal is an important way of testing systematic confidential performance. In recent years, the time-frequency analysis theory is more and more mature, effective time-frequency analytical algorithms are emerging constantly. The paper starts with the time-frequency character analysis of the chaos, the noise and the harmonic...
In order to solve the problem of rapid recognizing chaotic waves in the real-time, according to the characteristics of chaotic waves, a new method is proposed. The method can avoid a lot more calculating work, and simplifies measuring chaotic waves to achieve fast preliminary recognition efforts. Based on Chua's circuit, the mechanism of the method is introduced in detail. Periodic signal, noise signal,...
With the large scale application of integrated circuit in the chaotic encryption, the design of cryptogram program based on the chaotic system becomes a new trend of cryptography. The digital degradation after the chaotic digitization is a key issue to be resolved, while current study pays more attention to digital chaotic period behavior, but the other characteristics of digital chaotic also plays...
This research gives a new improvement scheme of Lorenz signal based on chaotic masking secure communication, which improves the notable features of Lorenz signal and the confidentiality of transmission signal in channel. The scheme here mainly changes the properties of chaotic signal in both time and frequency domains, which makes the masking signal in channel more like noise. This paper also does...
In the research of chaotic masking secure communication, there is a new optimization scheme which can process the Lorenz chaotic masking signal so that it can be similar to the noise in both time and frequency domain. In the processing, different optimization parameters make different effects on synchronous time and synchronous error which are what we focus on. This paper mainly processes and analyses...
This paper gives the circuit design for logistic digital chaotic system, with the analysis of parameter selection for logistic cipher code, effecting factors and calculating method of sequence cycle. Through experiments it is shown that different calculating precisions and u value can be the factor that effects the cycle period most, changing u value can change the cycle and the larger precision can...
In order to encrypt the plaintext information with FPGA encryption chip based on chaotic encryption algorithm, the Elliptic Curve Cryptography algorithm is applied to encrypt and transmit the initial key to realize secure exchange. This essay emphatically reseaches the improvement of the point multiplication and the subjacent multiplication operations of the elliptic curve encryption so as to speed...
A new controller is presented for the chaotic synchronization and secure communication problems of two Chuapsilas systems in application. The method of forming controller is given in the paper. And it is analysed and proved by using Lyapunov stability theory that the new controller can control the error of two different Chuapsilas chaotic systems to be asymptotically stable. Finally under the control...
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