Repeated differential properties of the AES-128 and AES-256 key schedules

Authors

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

RIS ID

50703

Publication Details

Huang, J., Susilo, W. & Seberry, J. (2011). Repeated differential properties of the AES-128 and AES-256 key schedules. In G. Wang, S. R. Tate, J. Chen & K. Sakurai (Eds.), Proceedings of the 10th IEEE International Conference on Trust, Security and Privacy in Computing and Communications (TrustCom) (pp. 525-532). USA: IEEE.

Abstract

In this paper, we further study the key schedule of the AES algorithm and present some repeated differential properties of the AES-128 and AES-256 key schedules. We define the concept of repeated differential pattern for the AES 128 key schedule, and the notion of double-sized repeated differential pattern for the AES-256 key schedule. We show that if we use the key schedule to expand two 128-bit (or 256-bit) secret keys with the repeated differential pattern (or double-sized repeated differential pattern), the resultant 10 round (or 14-round) subkeys have a large number of bytes in common and the differential pattern has strong repeated features.