International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 04 May 2016

Cong Chen, Mohammad Farmani, Thomas Eisenbarth
ePrint Report ePrint Report
In this work, we explore the possibilities for practical Threshold Implementation (TI) with only two shares in order for a smaller design that needs less randomness but is still first-order leakage resistant. We present the first two-share Threshold Implementations of two lightweight block ciphers---Simon and Present. The implementation results show that two-share TI gains in compactness while loses in throughput compared with three-share schemes. Moreover, the leakage analyses show that two-share TI retains perfect first-order resistance but is shadowed by a strong second-order leakage, making it less worthwhile.
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