A secure communication scheme based on chaotic Duffing oscillators and frequency estimation for the transmission of binary-coded messages (original) (raw)

A chaotic secure communication scheme based on duffing oscillators and frequency estimation

2013

This work presents a new technique to securely transmit and retrieve a message signal via chaotic systems. In our system, a two-valued message signal modulates the frequency of a Duffing oscillator sinusoidal term. An observer is used in the receiver side to retrieve the sinusoidal signal that contains the message and a novel frequency estimator is then used to reproduce an approximated estimation of the message signal. The performance of the system is analyzed by means of numerical simulations performed in Matlab.

A novel chaotic encryption technique for secure communication

Second IFAC Conference on Analysis and Control of Chaotic Systems (2009), 2009

In this work, a novel chaotic encryption technique is proposed to realize a secure communication system. In the proposed method, the message signal to be transmitted is first encrypted using a chaotic keystream and then masked with a chaotic signal. At the receiver end, the received chaotic signal is used for synchronization and to recover the encrypted signal. After applying the same keystream used in transmitter side, the message signal could be decrypted back. The main contribution of this work is generation of the keystream which is not part of the transmitter chaotic oscillator but is produced using an oscillator of different structure.

Secure Communication Based on Chaotic Cipher and Chaos Synchronization

The interdisciplinary journal of Discontinuity, Nonlinearity, and Complexity, 2012

We proposed a secure communication system, which combines two different techniques of chaotic cryptography: chaotic cipher based on the logistic map for information diffusion, and chaos synchronization of two coupled Rössler oscillators for information confusion. The system contains two channels, one for synchronization and another for information transmission. Using the chaotic logistic map, a message is encrypted into one of the variables of the Rössler oscillator in the transmitter and sent to the receiver via the communication channel, while the Rössler oscillators are synchronized via the synchronization channel by another variable. Due to excellent confusion and diffusion properties, both exploiting important properties of chaos, the proposed communication system is extremely secure and fast enough to provide communication in real time.

A new secure communication technique using a novel chaos-based nonlinear cryptography function

2008 16th European Signal Processing Conference, 2008

A new secure communication technique is proposed using a novel chaotic encryption method. A chaotic system with a single adjustable parameter, which has a structure that is similar to the Rikitake model, is used to construct the communication link between the receiver and the transmitter. The nonlinear function used for the encryption/decryption of the message utilizes a single time series of the receiver system along with a synchronization-based states observer and an adaptive parameter identifier. A Lyapunov function is used to design the parameter identifier that functions as an embedded secret key. The proposed technique is demonstrated to have improved security as the signal could be efficiently retrieved only if the secret key is known, even when both the receiver and the transmitter are in perfect synchronization. In addition, the proposed technique is shown to be easily implementable using both analog and digital hardware while being capable of transmitting signals with variable bandwidth.

Secure digital communication using chaotic modulation with feedback

Seventh International Symposium on Signal Processing and Its Applications, 2003. Proceedings., 2003

In this note we propose a new chaotic modulation scheme with output feedback. It is shown that the receiver can synchronize with the transmitter with any desired rate. Moreover, this approach can be applied to a large class of chaotic systems and provides higher security against an intruder. The robustness of our scheme with respect to noise is illlistrated and compared to the symmetric chaos shift keying method.

Digital Communication Using a Novel Combination of Chaotic Shift Keying and Duffing Oscillators

2013

In this paper, an improved technique for constructing Chaotic Shift Keying (CSK) for transmitting digital signals is introduced. In contrast to the classical methods where only two chaotic attractors, representing logic 0 and logic 1 are used to build CSK, the proposed system allows the chaotic transmitted signal to alternate among four different chaotic attractors. In addition, the transmitter parameters are used to implement a novel XOR-based encryption function to scramble the secret message. This has the effect of effectively hiding the secret message and providing better security and privacy against intruders’ attacks to the public communication channel. The parameters of the transmitter are assumed unknown, and are estimated at the receiver side to accomplish two tasks. The first one is to complete the synchronization process, while the second one is to decrypt the secret message using the duality property of the XOR-based digital function. A Duffing oscillator with smooth cub...

A Secure Communication System Based on a M odified Chaotic Chua Oscillator

2014

In this paper we propose a new scheme for secure communications us- ing a modified Chua oscillator. A modification of the oscillator is proposed in order to facilitate the decryption. The communication system requires two channels for transmitting the message. One of the channels transmits a chaotic signal generated by the oscillator and is used for synchronization. The second channel transmits the message encrypted by a nonlinear function. This function is built in terms of one of the chaotic signals, different from that sent on the first channel. In the receiver side, a synchronizer reconstructs the chaotic oscillator signals, one of which is used for the decryption of the message. The synchronization system is designed via Lyapunov theory and chaoticity proves via Poincare maps and Lyapunov exponents will be pro- vided in order to demonstrate the feasibility of our system. Numerical simulations will be used to evaluate the performance of the system.

An Approach for Secure Communication by Chaos-Based Cryptosystem

There is a great interest in secure communications within industry and various sectors of society. It has been found that chaotic systems and cryptosystems share many similar properties. For instance, chaotic systems are sensitive to the initial conditions, which correspond to the diffusion property of good cryptosystems. In this paper we describe a technique for transmitting digital information using pseudo chaotic carrier. The pseudo chaotic sequences are used as spreading codes to encode each user's message. The user's message can again be separated by the orthogonal property of chaotic sequences at the receiver. Chaos-based communication systems offer higher security Index Terms-chaos, pseudo chaotic carrier, chaotic function, NLFS R, PCS .

A Secure Chaotic Communication System

New generation communication networks are moving towards autonomous wireless infrastructures which are very popular in the application of multimedia broadcasting and mobile communication where N numbers of data are transfer through the wireless network every day. In such applications security of transmitted signal is very important in wireless communication network. So the proposed work creates a methodology to increase the security of the data and communication using chaotic encryption algorithm to transfer the data from the wireless network. A proposed new structure is based on coupling of chaotic system. We combine the text message with the chaotic signals to reduce the attack and improve the security of the data. The performance of BER in AWGN channel are verified and analyzed with MATLAB toolbox.

A Novel Chaotic State Modulated Secure Communication System

In this paper a new, efficient algorithm for secure digital communications in error free networks is presented. The proposed scheme uses pseudo chaotic random number generator (PCRNG) for secure communication. A quantized version of the PCRNG is used and the number of bits used for quantization decides the bandwidth expansion factor of resulting spread sequence. The proposed scheme utilises deterministic chaotic encryption via the logistic map and requires 3 keys. The initial seed, the chaotic equation and the value of constant α. This scheme has been successfully tested for the encryption of images and audio signals.