DPA on hardware implementations of Ascon and Keyak
Niels Samwel, Joan Daemen · 2017
This work applies side channel analysis on hardware implementations of two CAESAR candidates, Keyak and Ascon. Both algorithms are cryptographic sponges with an iterated permutation. The algorithms share an s-box so attacks on the non-linear step of the permutation are similar. This work presents the first results of a DPA attack on Keyak using traces generated by an FPGA. A new attack is crafted for a larger sensitive variable to reduce the number of traces. It also presents and applies the first CPA attack on Ascon. Using a toy-sized threshold implementation of Ascon we try to give insight in the order of the steps of a permutation.