A New Approach for a Unified Architecture for Type IV DCT/DST with an Efficient Incorporation of Obfuscation Technique

Doru Florin Chiper,Laura-Teodora Cotorobai

doi:10.3390/electronics10141656

Doru Florin Chiper, Laura-Teodora Cotorobai

Open Access

https://doi.org/10.3390/electronics10141656

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Abstract

This paper aims at solving one challenging problem in designing VLSI chips, namely, the security of the hardware, by presenting a new design approach that incorporates the obfuscation technique in the VLSI implementation of some important DSP algorithms. The proposed method introduces a new approach in obtaining a unified VLSI architecture for computing type IV discrete cosine transform (DCT-IV) and type IV discrete sine transform (DST-IV), with an efficient integration of the obfuscation technique, while maintaining low overheads. The algorithms for these two transforms were restructured in such a way that their structures are fairly similar, and thus they can be implemented on the same VLSI chip and on the same hardware with very few modifications, with the latter being attributed to the pre-processing and post-processing stages. The design proposed uses the regular and modular structures, which are named quasi-correlation, and the architecture is inspired by the paradigm of the systolic array architecture. Thus, the introduced design benefits the security, for the hardware, and also the advantages introduced by the use of the regular and modular structures. A very efficient, unified VLSI architecture for type IV DCT/DST can be obtained, which allows the computation of the two algorithms on the same hardware, allowing an efficient incorporation of the obfuscation technique with very low overheads, and it can be very efficiently implemented, offering high-speed performances and low hardware complexity, with the latter being attributed to the efficient use of the hardware resources for the computation of these two algorithms.

Highlights

In the past years, we have seen the telemedicine field growing and being one of great interest, and, in the current environment, where the online world is starting to take precedence, this field is starting to become a vital one
The discrete transforms DCT-IV and DST-IV, which were first introduced by Jain [1], have spectral analysis, signal processing and image coding as their main applications [2,3,4,5], and as such are valid candidates for being used in the telemedicine field
Based on the obfuscation technique introduced in [9], and developed in the method presented in [26], this paper introduces a unified architecture, with the same added advantage of hardware security, for both DCT-IV and DST-IV; this way it offers the possibility of selecting and using the transform that is most suited for the respective needed application, and, due to the similarity of the structures, they can both be implemented on the same VLSI chip

Summary

Introduction

We have seen the telemedicine field growing and being one of great interest, and, in the current environment, where the online world is starting to take precedence, this field is starting to become a vital one. The discrete transforms DCT-IV and DST-IV, which were first introduced by Jain [1], have spectral analysis, signal processing and image coding as their main applications [2,3,4,5], and as such are valid candidates for being used in the telemedicine field. These two transforms are computationally intensive and, as such, they need to be restructured to ensure they are fit for being used in applications in real-time. The present paper proposes reformulated algorithms for the calculation of both DCT-IV and DST-IV, in a such manner that an efficient unified VLSI architecture can be obtained, based on structures that are regular and modular, such as cyclic convolution and circular correlation, and that can be used for an efficient

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