Cryptology ePrint Archive: Report 2016/647

Strong 8-bit Sboxes with Efficient Masking in Hardware

Erik Boss and Vincent Grosso and Tim GŁneysu and Gregor Leander and Amir Moradi and Tobias Schneider

Abstract: Block ciphers are arguably the most important cryptographic primitive in practice. While their security against mathematical attacks is rather well understood, physical threats such as side-channel analysis (SCA) still pose a major challenge for their security. An effective countermeasure to thwart SCA is using a cipher representation that applies the threshold implementation (TI) concept. However, there are hardly any results available on how this concept can be adopted for block ciphers with large (i.e., 8-bit) Sboxes. In this work we provide a systematic analysis on and search for 8-bit Sbox constructions that can intrinsically feature the TI concept, while still providing high resistance against cryptanalysis. Our study includes investigations on Sboxes constructed from smaller ones using Feistel, SPN, or MISTY network structures. As a result, we present a set of new Sboxes that not only provide strong cryptographic criteria, but are also optimized for TI. We believe that our results will found an inspiring basis for further research on high-security block ciphers that intrinsically feature protection against physical attacks.

Category / Keywords: implementation / side-channel analysis, threshold implementation, 8-bit Sboxes

Original Publication (with major differences): IACR-CHES-2016

Date: received 22 Jun 2016

Contact author: tobias schneider-a7a at rub de

Available format(s): PDF | BibTeX Citation

Version: 20160624:202616 (All versions of this report)

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