The Effect of Various Number of Least Significant Bits substitution in Audio using Discrete Cosine Transform
A secure exchange of information is the need of todays digital world, achieved by either changing the shape of information according to a predefined key using cryptography or concealing the information in a cover media, in spatial or transform domain, using Stegnography. The hiding data in various least significant bits of DCT coefficients of an audio cover file is the subject of this work. This paper statistically analyze the effect of different number of least significant bits (LSB) on Stego audio in terms of signal to noise ratio (SNR), peak signal to noise ratio (PSNR), mean square error (MSE) and data hiding capacity. The hiding capacity increases significantly with the increase in the number of least significant bit substituted with information bits and results in a very insignificant variation in SNR, PSNR and MSE. The statistical analysis shows that audio Stegnography in DCT domain is subjected to more distortion at lower hiding capacity and is subject to almost the same distortion for large data hiding capacity.
Keywords: Audio Stegnography, Discrete Cosine Transform, Watermarking, Information Security, Steganalysis
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ABOUT THE AUTHORS
Sahib Khan
Engr. Sahib Khan got M.Sc. in Telecommunication Engineering from University of Engineering and Technology, Taxila in the year 2012 and B.Sc. in Telecommunication Engineering from University of Engineering and Technology, Peshawar in the year 2008. He currently holds the position of Lecturer in the Department of Electrical Engineering at University of Engineering and Technology, Peshawar. His research interests include Image and Signals Processing, Information Security and Antenna designing. He, along with his students, is developing and implementing Stegnographic techniques and algorithms, esp. Image and Audio Stegnography, in Spatial and Transform domains.
Umar Said
Dept. of Electrical Engineering, University of Engineering and Technology, Peshawar, Pakistan
Ejaz Ahmad
Dept. of Electrical Engineering, University of Engineering and Technology, Peshawar, Pakistan
Fazlullah
Dept. of Electrical Engineering, University of Engineering and Technology, Peshawar, Pakistan
Mukhtair Ali
Dept. of Electrical Engineering, University of Engineering and Technology, Peshawar, Pakistan
Sahib Khan
Engr. Sahib Khan got M.Sc. in Telecommunication Engineering from University of Engineering and Technology, Taxila in the year 2012 and B.Sc. in Telecommunication Engineering from University of Engineering and Technology, Peshawar in the year 2008. He currently holds the position of Lecturer in the Department of Electrical Engineering at University of Engineering and Technology, Peshawar. His research interests include Image and Signals Processing, Information Security and Antenna designing. He, along with his students, is developing and implementing Stegnographic techniques and algorithms, esp. Image and Audio Stegnography, in Spatial and Transform domains.
Umar Said
Dept. of Electrical Engineering, University of Engineering and Technology, Peshawar, Pakistan
Ejaz Ahmad
Dept. of Electrical Engineering, University of Engineering and Technology, Peshawar, Pakistan
Fazlullah
Dept. of Electrical Engineering, University of Engineering and Technology, Peshawar, Pakistan
Mukhtair Ali
Dept. of Electrical Engineering, University of Engineering and Technology, Peshawar, Pakistan
