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Audio security through compressive sampling and cellular automata

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Abstract

In this paper, a new approach for scrambling the compressive sensed (CS) audio data using two dimensional cellular automata is presented. In order to improve the security, linear feedback shift register (LFSR) based secure measurement matrix for compressive sensing is used. The basic idea is to select the different states of LFSR as the entries of a random matrix and orthonormalize these values to generate a Gaussian random measurement matrix. It is proposed to generate the initial state matrix of cellular automata using an LFSR based random bitstream generator. In order to improve the security and key space of the proposed cryptosystem, piecewise linear chaotic map (PWLCM) based initial seeds generation for LFSRs is used. In the proposed approach, the initial value, parameter value and the number of iterations of PWLCM are kept as secret to provide security. The proposed audio encryption method for CS audio data is validated with different compressive sensing reconstruction approaches. Experimental and analytical verification shows that the proposed encryption system gives good reconstruction performance, robustness to noise, high level of scrambling and good security against several forms of attack. Moreover, since the measurement matrix used for CS operation and the initial state matrix used for 2D cellular automata are generated using the secret key, the storage/transmission requirement of the same can be avoided.

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Authors and Affiliations

  1. Department of Electronics & Communication Engineering, National Institute of Technology, Calicut, India, 673601

    Sudhish N. George, Nishanth Augustine & Deepthi P. Pattathil

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  1. Sudhish N. George
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  2. Nishanth Augustine
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  3. Deepthi P. Pattathil
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Correspondence to Sudhish N. George.

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George, S.N., Augustine, N. & Pattathil, D.P. Audio security through compressive sampling and cellular automata. Multimed Tools Appl 74, 10393–10417 (2015). https://doi.org/10.1007/s11042-014-2172-2

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  • DOI: https://doi.org/10.1007/s11042-014-2172-2

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