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The secure wavelet transform

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Abstract

There has been an increasing concern for the security of multimedia transactions over real-time embedded systems. Partial and selective encryption schemes have been proposed in the research literature, but these schemes significantly increase the computation cost leading to tradeoffs in system latency, throughput, hardware requirements and power usage. In this paper, we propose a light-weight multimedia encryption strategy based on a modified discrete wavelet transform (DWT) which we refer to as the secure wavelet transform (SWT). The SWT provides joint multimedia encryption and compression by two modifications over the traditional DWT implementations: (a) parameterized construction of the DWT and (b) subband re-orientation for the wavelet decomposition. The SWT has rational coefficients which allow us to build a high throughput hardware implementation on fixed point arithmetic. We obtain a zero-overhead implementation on custom hardware. Furthermore, a Look-up table based reconfigurable implementation allows us to allocate the encryption key to the hardware at run-time. Direct implementation on Xilinx Virtex FPGA gave a clock frequency of 60 MHz while a reconfigurable multiplier based design gave a improved clock frequency of 114 MHz. The pipelined implementation of the SWT achieved a clock frequency of 240 MHz on a Xilinx Virtex-4 FPGA and met the timing constraint of 500 MHz on a standard cell realization using 45 nm CMOS technology.

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  1. Electrical and Computer Engineering, 2215 Coover Hall, Ames, IA, 50011, USA

    Amit Pande & Joseph Zambreno

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  1. Amit Pande
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  2. Joseph Zambreno
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Correspondence to Amit Pande.

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Pande, A., Zambreno, J. The secure wavelet transform. J Real-Time Image Proc 7, 131–142 (2012). https://doi.org/10.1007/s11554-010-0165-6

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