Open AccessEnhanced secure strategy for electro-optic chaotic systems with delayed dynamics by using fractional Fourier transformation
Author(s) -
Mengfan Cheng,
Lei Deng,
Hao Li,
Deming Liu
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.005241
Subject(s) - chaotic , fractional fourier transform , pseudorandom binary sequence , computer science , fourier transform , key space , transformation (genetics) , sequence (biology) , binary number , algorithm , control theory (sociology) , electronic engineering , optics , physics , mathematics , fourier analysis , artificial intelligence , engineering , mathematical analysis , biochemistry , chemistry , genetics , arithmetic , control (management) , biology , gene
We propose a scheme whereby a time domain fractional Fourier transform (FRFT) is used to post process the optical chaotic carrier generated by an electro-optic oscillator. The time delay signature of the delay dynamics is successfully masked by the FRFT when some conditions are satisfied. Meanwhile the dimension space of the physical parameters is increased. Pseudo random binary sequence (PRBS) with low bit rate (hundreds of Mbps) is introduced to control the parameters of the FRFT. The chaotic optical carrier, FRFT parameters and the PRBS are covered by each other so that the eavesdropper has to search the whole key space to crack the system. The scheme allows enhancing the security of communication systems based on delay dynamics without modifying the chaotic source. In this way, the design of chaos based communication systems can be implemented in a modular manner.