International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 03 September 2012

Sebastian Kutzner, Phuong Ha Nguyen, Axel Poschmann, Huaxiong Wang
ePrint Report ePrint Report
One of the most promising lightweight hardware countermeasures against SCA attacks is the so-called Threshold Implementation (TI) countermeasure. In this work we resolve many of the remaining open issues towards it\'s applicability. In particular, our contribution is

three-fold: first we define which optimal (from a cryptographic point of view)

S-boxes can be implemented with a 3-share TI. Second, we

introduce two methodologies to efficiently implement

these S-boxes. Third, as an example, we successfully apply these

methodologies to PRESENT and are able to decrease the area requirements of its protected S-box

by 57\\%.

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