Some RSSB constructions with improved resistance towards differential power analysis

In 1999, Kocher et al. demonstrated the differential power analysis (DPA) attacks on secured cryptographic implementation of AES. Later, this attack along with correlation power analysis (CPA) posed a critical challenge from cryptographers' perspective that not only mathematical security of a cryptographic algorithm, the physical security of its implementation (be it software or hardware) must be proven to call the system "secured". The class of rotation symmetric S-boxes (RSSBs) are linearly equivalent to the S-boxes constructed from power maps which means the important crytographic properties of the power maps are also present in the class of RSSBs. In this talk, we present some RSSB constructions which are targeted for improved resistance to DPA attacks and also have a good tradeoff of cryptographic properties like high nonlinearity and low GAC absolute indicator value.