On Comparing Side-channel Properties of AES and ChaCha20 on Microcontrollers

Conference paper (2018)

Authors

Z. Najm Nanyang Technological University,
Dirmanto Jap Nanyang Technological University
Bernhard Jungk Independent researcher
Shivam Bhasin Nanyang Technological University
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Published Date

2018

Language

English

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Abstract

Side-channel attacks are a real threat to many secure systems. In this paper, we consider two ciphers used in the automotive industry – AES and ChaCha20 and we evaluate their resistance against side-channel attacks. In particular, the focus is laid upon the main non-linear component in these ciphers. Owing to the design of ChaCha20, it offers natural timing side-channel resistance and thus is suitable for affected applications. However, attacks exploiting the power side-channel are somewhat more difficult on ChaCha20 as compared to AES, but the overhead to protect ChaCha20 against such attack is considerably higher.

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