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Rao K.D.,Osmania University | Gangadhar C.,Siddhartha Institute of Technology
2012 Annual IEEE India Conference, INDICON 2012 | Year: 2012

Chaos based encryption may offer new quality in secure data transmission. A recently proposed chaotic-key based algorithm(CKBA) has been shown to be unavoidably susceptible to chosen/known-plaintext attacks and ciphertext-only attacks. In this paper , a new algorithm based on modified chaotic-key based algorithm (MCKBA) and finite field wavelet packet division multiplexing (FFWPDM) is proposed for secure orthogonal multiplexing of images. Further, VLSI architecture of the proposed algorithm is designed. The VLSI architecture is implemented on images using XILINX ISE and ModelSim to demonstrate the effectiveness of the proposed scheme. © 2012 IEEE.

Usha Rani B.,Siddhartha Institute of Technology | Praveena B.,Siddhartha Institute of Technology | Ramanjaneyulu K.,Siddhartha Institute of Technology
ACM International Conference Proceeding Series | Year: 2015

Digital image watermarking is the technology that is used in information security applications like digital image content protection and Copyright protection. In this paper, a brief review of literature on digital image watermarking is presented. Watermarking algorithms can be classified based on different criterions. Depending upon the specific application, watermarking algorithm should satisfy certain requirements. Important parameters used to measure the quality of watermarking are Peak Signal to Noise Ratio (PSNR) and Normalized Cross Correlation (NCC). PSNR represents visual quality of the watermarked image. NCC indicates the visual quality of extracted watermark. For comparing the performance of different watermarking algorithms, PSNR and NCC values against various attacks are measured. © Copyright 2015 ACM.

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