Paper Info
Title
Meet-In-The-Middle Attacks Revisited: Key-Recovery, Collision, And Preimage Attacks
Abstract
At EUROCRYPT 2021, Bao et al. proposed an automatic method for systematically exploring the configuration space of meet-in-the-middle (MITM) preimage attacks. We further extend it into a constraint-based framework for finding exploitable MITM characteristics in the context of key-recovery and collision attacks by taking the subtle peculiarities of both scenarios into account. Moreover, to perform attacks based on MITM characteristics with nonlinear constrained neutral words, which have not been seen before, we present a procedure for deriving the solution spaces of neutral words without solving the corresponding nonlinear equations or increasing the overall time complexities of the attack. We apply our method to concrete symmetric-key primitives, including SKINNY, ForkSkinny, Romulus-H, Saturnin, Grostl, WHIRLPOOL, and hashing modes with AES-256. As a result, we identify the first 23-round key-recovery attack on SKINNY-n-3n and the first 24-round key-recovery attack on ForkSkinny-n-3n in the single-key model. Moreover, improved (pseudo) preimage or collision attacks on round-reduced WHIRLPOOL, Grostl, and hashing modes with AES-256 are obtained. In particular, employing the new representation of the AES key schedule due to Leurent and Pernot (EUROCRYPT 2021), we identify the first preimage attack on 10-round AES-256 hashing.
Year
DOI
Venue
2021
10.1007/978-3-030-84252-9_10
ADVANCES IN CRYPTOLOGY - CRYPTO 2021, PT III
Keywords
DocType
Volume
Meet-in-the-Middle, Three-subset MITM, Preimage attack, Collision attack, AES-256, MILP
Conference
12827
ISSN
Citations 
PageRank 
0302-9743
0
0.34
References 
Authors
0
6
Name
Order
Citations
PageRank
Xiaoyang Dong12211.74
Jialiang Hua200.68
Siwei Sun317323.65
Zheng Li454266.91
Xiaoyun Wang52338170.86
Lei Hu600.68