Informatics Publishing Limited

R. Raja Kumar ¹, A. Sampath ¹, P. Indumathi ²

Affiliations
1 Mathematics Department, Sathyabama University, Chennai-119, IN
2 Electronics Engineering Department, MIT Campus, Anna University, Chennai, IN

Abstract

This paper proposes a Frequency Hopped Spread Spectrum (FHSS) communication system using chaos and its synchronization. The spread spectrum technique of frequency hopping uses pseudorandom number (PN) generator to produce a random sequence of frequencies. A new class of signature sequences for use in Frequency Hopped Spread Spectrum communication systems is proposed. In arriving at these sequences, the theory of chaos has been used. The correlation properties of these chaotic sequences are similar to random white noise. The numbers and lengths of chaotic sequences are not restricted like m sequences. The performances of chaotic sequences in multiple access communication are shown to be similar to that of PN sequences. Furthermore, due to their noise like appearance, chaotic sequences outperform PN sequences in low probability of intercept. In this method the spreading sequences change from one bit to the next in very random like fashion, causing undesired interception to be very difficult. The synchronization of the system is also proposed.

Keywords

Chaotic Sequences, Chaotic System, FHSS, PN Sequences, Synchronization.

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R. Raja Kumar ¹, A. Sampath ¹, P. Indumathi ²

Affiliations
1 Mathematics Department, Sathyabama University, Chennai-119, IN
2 Electronics Engineering Departments, MIT Campus, Anna University, Chennai, IN

Abstract

In this paper we examine one of the recently proposed chaotic image encryption algorithms, based on chaotic map lattices (CML). We also study and examine another algorithm that could satisfy expectations of efficiency and security in the case of digital colour image encryption. The proposed algorithm provides more security and secrecy to the colour digital images as compared to the security provided by the existing CML based algorithm suggested by Pisarchik. At the end, we show the results of a security analysis and a comparison of both schemes.

Keywords

Chaotic Map Lattice, Digital Image, Image Encryption, Security.

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