International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Cryptanalysis of Efficient Masked Ciphers: Applications to Low Latency

Tim Beyne , KU Leuven
Siemen Dhooghe , KU Leuven
Amir Moradi , Ruhr University Bochum
Aein Rezaei Shahmirzadi , Ruhr University Bochum
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Abstract: This work introduces second-order masked implementations of LED, Midori, SKINNY, and PRINCE ciphers which do not require fresh masks to be updated at every clock cycle. The main idea lies on a combination of the constructions given by Shahmirzadi and Moradi at CHES2021, and the theory presented by Beyne et al. at Asiacrypt2020. The presented masked designs only use a minimal number of shares, i.e., three to achieve second-order security, and we make use of a trick to pair a couple of S-boxes to reduce their latency. The theoretical security analyses of our constructions are based on the linear-cryptanalytic properties of the underlying masked primitive as well as SILVER, the leakage verification tool presented at Asiacrypt2020. To improve this cryptanalytic analysis, we use the noisy probing model which allows for the inclusion of noise in the framework of Beyne et al. We further provide FPGA-based experimental security analysis confirming second-order protection of our masked implementations.
  title={Cryptanalysis of Efficient Masked Ciphers: Applications to Low Latency},
  journal={IACR Transactions on Cryptographic Hardware and Embedded Systems},
  author={Tim Beyne and Siemen Dhooghe and Amir Moradi and Aein Rezaei Shahmirzadi},