Design and Realization of a New Signal Security System for Multimedia Data Transmission
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Design and Realization of a New Signal Security System for Multimedia Data Transmission Hun-Chen Chen Department of Electronics Engineering, National United University, Miaoli 360, Taiwan Email: [email protected]
Jiun-In Guo Department of Computer Science and Information Engineering, National Chung Cheng University, Chia-Yi 621, Taiwan Email: [email protected]
Lin-Chieh Huang Department of Computer Science and Information Engineering, National Chung Cheng University, Chia-Yi 621, Taiwan Email: [email protected]
Jui-Cheng Yen Department of Electronics Engineering, National United University, Miaoli 360, Taiwan Email: [email protected] Received 22 January 2003 and in revised form 25 August 2003 We propose a new signal security system and its VLSI architecture for real-time multimedia data transmission applications. We first define two bit-circulation functions for one-dimensional binary array transformation. Then, we exploit a chaotic system in generating a binary sequence to control the bit-circulation functions defined for performing the successive transformation on the input data. Each eight 8-bit data elements is regarded as a set and is fed into an 8 × 8 binary matrix being transformed on each row and each column of the matrix by these two bit-circulation functions such that the signal can be transformed into completely disordered data. The features of the proposed design include low computational complexity, regular operations suitable for lowcost VLSI implementation, high data security, and high feasibility for easy integration with commercial multimedia storage and transmission applications. We have performed Matlab simulation to verify the functional correctness of the proposed system. In implementing the system, a low-cost VLSI architecture has been designed, verified, and physically realized based on a 0.35 µm CMOS technology. The implementation results show that the proposed signal security system can achieve 117 Mbytes/s data throughput rate that is fast enough for real-time data protection in multimedia transmission applications. Keywords and phrases: signal encryption/decryption, VLSI chip, chaotic system, and fractal dimension.
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INTRODUCTION
Recently, with the great demand in digital signal transmission[1, 2] and the big losses from illegal data access, data security has become a critical and imperative issue in the multimedia data transmission applications. In order to protect valuable data from undesirable readers or against illegal reproduction and modifications, there have been various data encryption techniques [3, 4, 5, 6, 7, 8, 9, 10] and the watermark embedding schemes [11, 12, 13] on images proposed in the literature. The data encryption techniques make the images invisible to undesirable readers and can be applied to protect the frames in the digital versatile disk (DVD) and the cable TV, while the watermark-embedded schemes hide the
watermark onto an image to declare their ownership but the image is still visible. Among the existing data encryption techniques [3, 4, 5, 6, 7, 8, 9,
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