Small Stretch Problem of the DCT Scheme and How to Fix it

ePrint Report: Small Stretch Problem of the DCT Scheme and How to Fix it

Yuchao Chen, Tingting Guo, Lei Hu, Lina Shang, Shuping Mao, Peng Wang

DCT is a beyond-birthday-bound~(BBB) deterministic authenticated encryption~(DAE) mode proposed by Forler et al. in ACISP 2016, ensuring integrity by redundancy. The instantiation scheme of DCT employs the BRW polynomial, which is more efficient than the usual polynomial function in GCM by reducing half of the multiplication operations. However, we show that DCT suffers from …

bbb beyond chen encryption eprint report fix integrity mode problem redundancy report stretch wang