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Private Communications with Chaos Based on the Fixed-Point Computation
Hiroyuki KAMATA Yohei UMEZAWA Masamichi DOBASHI Tetsuro ENDO Yoshihisa ISHIDA
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/06/25
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Information Security
chaos, private communications, fixed-point computation, unstable digital filters,
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This paper proposes a private communication system with chaos using fixed-point digital computation. When fixed-point computation is adopted, chaotic properties of the modulated signal should be checked carefully as well as calculation error problems (especially, overflow problems). In this paper, we propose a novel chaos modem system for private communications including a chaotic neuron type nonlinearity, an unstable digital filter and an overflow function. We demonstrate that the modulated signal reveals hyperchaotic property within 10,000 data point fixed-point computation, and evaluate the security of this system in view of the sensitivity of coefficients for demodulation.