Differential and Rotational Cryptanalysis of Round-reduced MORUS
Ashutosh Dhar Dwivedi, Paweł Morawiecki, Sebastian Wójtowicz · 2017
In this paper we investigate the security margin of MORUS-an authenticated cipher taking part in the CAESAR competition. We propose a new key recovery approach, which can be seen as an accelerated exhaustive search. We also verify the resistance of MORUS against internal differential and rotational cryptanalysis. Our analysis reveals that the cipher has a solid security margin and a lack of round constants does not bring any weakness. Our work helps to reliably evaluate this new, high-performance algorithm, which is particularly important in the context of the ongoing CAESAR competition.