Optimally Secure Tweakable Block Ciphers with a Large Tweak from n-bit Block Ciphers

ePrint Report: Optimally Secure Tweakable Block Ciphers with a Large Tweak from n-bit Block Ciphers

Yaobin Shen, François-Xavier Standaert

We consider the design of a tweakable block cipher from a block cipher whose inputs and outputs are of size $n$ bits. The main goal is to achieve $2^n$ security with a large tweak (i.e., more than $n$ bits). Previously, Mennink at FSE'15 and Wang et al. at Asiacrypt'16 proposed constructions that can achieve $2^n$ security. Yet, these constructions can have …

bits block cipher ciphers design eprint report inputs large main report size xavier