[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

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Chaos Making A New Science

Book review: Applied cryptography: Protocols, algorithms, and source code in C

FPGA realization of multi-scroll chaotic oscillators

Studying systems with hidden attractors is new attractive research direction because of its practical and threoretical importance. A novel system with an exponential nonlinear term, which can exhibit hidden attractors, is proposed in this work. Although new system possesses no equilibrium points, it displays rich dynamical behaviors, like chaos. By calculating Lyapunov exponents and bifurcation diagram, the dynamical behaviors of such system are discovered. Moreover, two important features of a chaotic system, the possibility of synchronization and the feasibility of the theoretical model, are also presented by introducing an adaptive synchronization scheme and designing a digital hardware platform-based emulator.

Hidden attractors in a chaotic system with an exponential nonlinear term

A new auto-switched chaotic system and its FPGA implementation

In this paper, we propose and demonstrate experimentally a new wireless digital encryption hyperchaotic communication system based on radio frequency (RF) communication protocols for secure real-time data or image transmission. A reconfigurable hardware architecture is developed to ensure the interconnection between two field programmable gate array development platforms through XBee RF modules. To ensure the synchronization and encryption of data between the transmitter and the receiver, a feedback masking hyperchaotic synchronization technique based on a dynamic feedback modulation has been implemented to digitally synchronize the encrypter hyperchaotic systems. The obtained experimental results show the relevance of the idea of combining XBee (Zigbee or Wireless Fidelity) protocol, known for its high noise immunity, to secure hyperchaotic communications. In fact, we have recovered the information data or image correctly after real-time encrypted data or image transmission tests at a maximum distance (indoor range) of more than 30 m and with maximum digital modulation rate of 625,000 baud allowing a wireless encrypted video transmission rate of 25 images per second with a spatial resolution of 128 × 128 pixels. The obtained performance of the communication system is suitable for secure data or image transmissions in wireless sensor networks.

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Design and FPGA implementation of a wireless hyperchaotic communication system for secure real-time image transmission

Synchronized hybrid chaotic generators: Application to real-time wireless speech encryption

In this paper, we present a new approach for real-time implementation of the Chen's chaotic system on Field Programmable Gate Array (FPGA). The approach consists on using structural hardware description language (VHDL) with a fixed-point representation, contrary to some previous works which use somewhat non optimal VHDL code generation using automatic code generation tools. The obtained real-time chaotic signals are compared with those obtained using ModelSim and Matlab. The hardware implementation exhibits good performances of throughput and cost in term of resources used. The aim of this implementation is to use this chaotic generator in secure digital chaotic communication system.

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An FPGA Real-time Implementation of the Chen's Chaotic System for Securing Chaotic Communications

In this paper, we present a new approach for realtime FPGA implementation of the random key based Lorenz's chaotic generator for data stream encryption. We propose a structural hardware architecture designed for a small chip area and high speed performance. This architecture is particularly attractive since it provides a low-cost security telecommunication solution while holding or increasing the encryption throughput rate. We show its feasibility through implementation which is detailed and presented using Virtex Xilinx FPGA. This architecture employs only 1926 slices and allows achieving a random key throughput rate of 124 Mbps by using a low system clock with a frequency of up to 15,5 MHz allowing low power consumption especially for embedded applications.

Mohamed Salah Azzaz

Papers

A new auto-switched chaotic system and its FPGA implementation

Design and FPGA implementation of a wireless hyperchaotic communication system for secure real-time image transmission

Synchronized hybrid chaotic generators: Application to real-time wireless speech encryption

An FPGA Real-time Implementation of the Chen's Chaotic System for Securing Chaotic Communications

Real-time FPGA implementation of Lorenz's chaotic generator for ciphering telecommunications