IJCRR - 3(10), October, 2011
Pages: 162-167
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SECURE COMMUNICATION USING A HYPERCHAOS BASED SIGNAL TRANSMISSION SCHEME
Author: S Manimaran, V Balachandran, G Kandiban
Category: General Sciences
Abstract:A new hyperchaos based signal transmission scheme is proposed to transmit digital information signal by
using the conventional synchronization of hyperchaos and digital transmission approaches. In this scheme
the two different hyperchaotic system is used to generate an analog key after thresholding a different
hyperchaotic signal. This signal along with the information digital signal is used to generate the
transmitted signal. Then the transmitted signal is masked by the two different hyperchaotic signals of the
transmitter and is transmitted through the channel to the receiver as well as used to drive the transmitter
hyperchaotic systems using the concept of self-modulation. At the receiver end, suitable feedback loop is
constructed for unmasking and then the subtraction rule is used to recover the information signal. By
considering appropriate circuit configuration, the experimental results are presented.
Keywords: Hyperchaotic communication, Hyperchaotic modulation, Signal transmission, Performance analysis
Full Text:
INTRODUCTION
There has been a great deal of research on hyperchaotic communication system. Following these approaches, different methods have been developed in order to make the content of a message using hyperchaotic signals1 . The problem of unmasking the information message from the different two hyperchaotic carrier signals, different approaches for designing cryptosystems based on hyperchaos have been recently introduced2 . In these schemes both conventional cryptographic method and synchronization of hyperchaotic systems are combined so that the level of security of the transmitted hyperchaotic signal is enhanced. So, presently, we have shown the effective usage of different two hyperchaotic system to generate hyperchaotic digital transmission signal by employing suitable thresholding mechanism on one of the state variables of the different two hyperchaotic systems at the transmitter. Then the modulo-three addition (op-amp adder) is performed between the digital information signal and the threshold hyperchaotic digital transmission signal. A small amplitude version of the transmitted signal is further masked by the different two hyperchaotic signal of the transmitter and is transmitted through the channel to the receiver as well as used to drive the transmitter hyperchaotic system using the concept of self-modulation3 . For receiver, at the receiver module upon synchronization, the modulo-subtraction is performed with the regenerated hyperchaotic transmission analog key signals with the reproduced transmitted signal to recover the digital information signal.
EXPERIMENTAL SET-UP AND RESULTS The actual circuit realization of the different two hyperchaotic system based on signal transmission scheme for the case of autonomous third order Chua‘s circuit and simple 4D hyperchaotic oscillator circuit is shown in Fig. 1.
CONCLUSIONS
We present here a new hyperchaos based secure communication system by combining the strength of conventional signal transmission scheme and hyperchaos based communication methods. Further the hyperchaotic signals from the same transmitter and receiver pair have been utilized to transmission and receiving the information signal respectively. The security of the system is potentially increased due to the opamp arithmetic operation between the digital information signal and the hyperchaotic digital transmission signal as op-amp addition operation mask the information of both the hyperchaotic transmitter and the message efficiently. The effect of perturbing factor like channel noise and parameter mismatch is investigated and their corresponding performance analysis are discussed.
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