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Information 2018, 9(1), 13; https://doi.org/10.3390/info9010013

Lightweight S-Box Architecture for Secure Internet of Things

School of Electronics Engineering, VIT University Chennai, Tamil Nadu 600127, India
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Received: 12 December 2017 / Revised: 22 December 2017 / Accepted: 5 January 2018 / Published: 8 January 2018
(This article belongs to the Special Issue Security in the Internet of Things)
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Abstract

Lightweight cryptographic solutions are required to guarantee the security of Internet of Things (IoT) pervasiveness. Cryptographic primitives mandate a non-linear operation. The design of a lightweight, secure, non-linear 4 × 4 substitution box (S-box) suited to Internet of Things (IoT) applications is proposed in this work. The structure of the 4 × 4 S-box is devised in the finite fields GF (24) and GF ((22)2). The finite field S-box is realized by multiplicative inversion followed by an affine transformation. The multiplicative inverse architecture employs Euclidean algorithm for inversion in the composite field GF ((22)2). The affine transformation is carried out in the field GF (24). The isomorphic mapping between the fields GF (24) and GF ((22)2) is based on the primitive element in the higher order field GF (24). The recommended finite field S-box architecture is combinational and enables sub-pipelining. The linear and differential cryptanalysis validates that the proposed S-box is within the maximal security bound. It is observed that there is 86.5% lesser gate count for the realization of sub field operations in the composite field GF ((22)2) compared to the GF (24) field. In the PRESENT lightweight cipher structure with the basic loop architecture, the proposed S-box demonstrates 5% reduction in the gate equivalent area over the look-up-table-based S-box with TSMC 180 nm technology. View Full-Text
Keywords: finite fields; lightweight block ciphers; S-box; hardware design finite fields; lightweight block ciphers; S-box; hardware design
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Prathiba, A.; Bhaaskaran, V.S.K. Lightweight S-Box Architecture for Secure Internet of Things. Information 2018, 9, 13.

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