Digital Signal Processing


Embedding Data in Images Securely using Chaos

Authors: Sai Venkatesh Balasubramanian

A robust high-fidelity technique to hide data in images using chaos is proposed and implemented. By efficiently harnessing the nonlinearity of a semiconductor device such as a MOSFET, a chaotic carrier signal is generated using extremely simple circuitry. This chaotic carrier forms the secure key of the proposed embedding system. The generated chaotic signal is validated using standard metrics such as Lyapunov Exponent, Fractal dimension and Kolmogorov Entropy. The generated carrier is then modulated with three message signals and are embedded into the three colors of the carrier image using a scaling factor. The exact frequencies and amplitudes used to generate the chaotic carrier are used in the receiver end to regenerate the carrier, using which the message is decoded from the embedded image. Standard measures such as Mean Square Error and Peak Signal to Noise Ratio are used to characterise the fidelity of the embedding process. The observed large PSNR values corresponding with high sensitivity as observed in the Lyapunov exponent of the chaotic carrier indicate the achievement of the golden advantages of Sensitivity, Fidelity and Simplicity which form the highlights of the present work.

Comments: 15 Pages.

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Submission history

[v1] 2015-10-28 20:23:19

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