Differential fault analysis of LEX

Authors

Jianyong Huang, University of Wollongong
Willy Susilo, University of WollongongFollow
Jennifer Seberry, University of WollongongFollow

RIS ID

34098

Publication Details

Huang, J, Susilo, W and Seberry, J, Differential fault analysis of LEX, Proceedings of the Security and Cryptography for Networks 7th International Conference, SCN 2010, Amalfi, Italy, September 13-15, 2010.

Abstract

LEX is a stream cipher based on the round transformation of the AES block cipher, and it was selected for the final phase evaluation of the eSTREAM project. LEX is 2.5 times faster than AES both in software and in hardware. In this paper, we present a differential fault attack on LEX. The fault model assumes that the attacker is able to flip a random bit of the internal state of the cipher but cannot control the exact location of the induced fault. Our attack requires 40 faults, and recovers the secret key with 216 operations.