A new class of S-boxes with optimal Feistel boomerang uniformity

Yuxuan Lu, Sihem Mesnager, Nian Li +2

The Feistel Boomerang Connectivity Table ($\mathrm{FBCT}$), which is the Feistel version of the Boomerang Connectivity Table ($\mathrm{BCT}$), plays a vital role in analyzing block ciphers…