Paper 2015/105

Inner Product Masking Revisited

Josep Balasch, Sebastian Faust, and Benedikt Gierlichs


Masking is a popular countermeasure against side channel attacks. Many practical works use Boolean masking because of its simplicity, ease of implementation and comparably low performance overhead. Some recent works have explored masking schemes with higher algebraic complexity and have shown that they provide more security than Boolean masking at the cost of higher overheads. In particular, masking based on the inner product was shown to be practical, albeit not efficient, for a small security parameter, and at the same time provable secure in the domain of leakage resilient cryptography for a large security parameter. In this work we explore a security versus efficiency tradeoff and provide an improved and tweaked inner product masking. Our practical security evaluation shows that it is less secure than the original inner product masking but more secure than Boolean masking. Our performance evaluation shows that our scheme is only four times slower than Boolean masking and more than two times faster than the original inner product masking. Besides the practical security analysis we prove the security of our scheme and its masked operations in the threshold probing model.

Available format(s)
Secret-key cryptography
Publication info
Published by the IACR in EUROCRYPT 2015
side channel attackhigher-order maskinginner product
Contact author(s)
benedikt gierlichs @ esat kuleuven be
2015-02-24: received
Short URL
Creative Commons Attribution


      author = {Josep Balasch and Sebastian Faust and Benedikt Gierlichs},
      title = {Inner Product Masking Revisited},
      howpublished = {Cryptology ePrint Archive, Paper 2015/105},
      year = {2015},
      note = {\url{}},
      url = {}
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