On masked galois-field multiplication for authenticated encryption resistant to side channel analysis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

This paper presents a side-channel attack on masked Galois-field (GF) multiplication used in authenticated encryptions including AES-GCM and a new countermeasure against the proposed attack. While the previous side-channel attack is likely to recover the full key of GHASH in AES-GCM, no countermeasure has been discussed and evaluated until now. In this paper, we first apply a straightforward masking countermeasure to GF multiplication for GHASH and show that the masked GF multiplication is resistant to the previous attack. We then show the straightforward masked GHASH can be defeated by a new attack utilizing the variance of power trace. The feasibility of the new attack is demonstrated by an experiment with power traces measured from a smart card operating the masked GHASH. Finally, we propose a new masking countermeasure against the proposed attack.

Original languageEnglish
Title of host publicationConstructive Side-Channel Analysis and Secure Design - 9th International Workshop, COSADE 2018, Proceedings
EditorsJunfeng Fan, Benedikt Gierlichs
PublisherSpringer Verlag
Pages44-57
Number of pages14
ISBN (Print)9783319896403
DOIs
Publication statusPublished - 2018
Event9th International Workshop on Constructive Side-Channel Analysis and Secure Design, COSADE 2018 - Singapore, Singapore
Duration: 2018 Apr 232018 Apr 24

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume10815 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Other

Other9th International Workshop on Constructive Side-Channel Analysis and Secure Design, COSADE 2018
CountrySingapore
CitySingapore
Period18/4/2318/4/24

Keywords

  • AES-GCM
  • Authenticated encryption
  • Galois-field multiplication
  • Masking
  • Side-channel attack

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)

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