Stream Cipher Based Modified Espresso Algorithm for 5G Communication

Chinmay Bepery; Simab Al Ahmmed; Md. Moazzem Hossain Riad; Md. Arifur Rahman; Md. Samsuzzaman; Sayed Md. Galib

Abstract

AbstractTo meet the requirement of 5G communication, Dubrova and Hell design Espresso, which is a stream cipher. Espresso uses 128-bit key, 96-bit initial vector (IV) and a 6-degree Boolean function as its output function. Jia-Min and Wen-Feng showed that algebraic attack is possible with time complexity being O(2(66.86)). In this paper, we present a methodology for the modification of Espresso with reformed Galois configuration of 256-bit Nonlinear Feedback Shift Registers (NLFSR) and 8-degree Boolean function as its output function. The advantages of Galois and Fibonacci configuration of NLFSRs, short propagation delay, and 8-degree Boolean function are combined in our algorithm which make it invulnerable to the classical algebraic attack and correlation attack.Keywords: Stream cipher, 5G, NLFSR, algebraic attack, EspressoCite this ArticleChinmay Bepery, Simab Al Ahmmed, Md. Moazzem Hossain Riad, Md. Arifur Rahman, Md. Samsuzzaman, Sayed Md. Galib. Stream Cipher Based Modified Espresso Algorithm for 5G Communication. Journal of Computer Technology & Applications. 2019; 10(1): 32–40p.