Paper 2009/242
Examples of differential multicollisions for 13 and 14 rounds of AES-256
Alex Biryukov, Dmitry Khovratovich, and Ivica Nikolić
Abstract
Here we present practical differential $q$-multicollisions for AES-256, which can be tested on any implementation of AES-256. In our paper "Distinguisher and Related-Key Attack on the Full AES-256" $q$-multicollisions are found with complexity $q\cdot 2^{67}$. We relax conditions on the plaintext difference $\Delta_P$ allowing some bytes to vary and find multicollisions for 13 and 14 round AES with complexity $q\cdot 2^{37}$. Even with the relaxation there is still a large complexity gap between our algorithm and the lower bound that we have proved in Lemma 1. Moreover we believe that in practice finding even two fixed-difference collisions for a good cipher would be very challenging.
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Published elsewhere. Unknown where it was published
- Keywords
- AESchosen key distinguisher
- Contact author(s)
- khovratovich @ gmail com
- History
- 2009-05-30: received
- Short URL
- https://ia.cr/2009/242
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2009/242,
author = {Alex Biryukov and Dmitry Khovratovich and Ivica Nikolić},
title = {Examples of differential multicollisions for 13 and 14 rounds of {AES}-256},
howpublished = {Cryptology {ePrint} Archive, Paper 2009/242},
year = {2009},
url = {https://eprint.iacr.org/2009/242}
}
