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Iterative Block Ciphers from Tweakable Block Ciphers with Long Tweaks
IACR Transactions on Symmetric Cryptology, 2020 We consider a problem of constructing a secure block cipher from a tweakable block cipher (TBC) with long tweaks. Given a TBC with n-bit blocks and Γn-bit tweaks for Γ ≥ 1, one of the constructions by Minematsu in DCC 2015 shows that a simple iteration ...
Ryota Nakamichi, Tetsu Iwata
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Duel of the Titans: The Romulus and Remus Families of Lightweight AEAD Algorithms
IACR Transactions on Symmetric Cryptology, 2020 In this article, we propose two new families of very lightweight and efficient authenticated encryption with associated data (AEAD) modes, Romulus and Remus, that provide security beyond the birthday bound with respect to the block-length n.
Tetsu Iwata +3 more
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Forking Tweakable Even-Mansour Ciphers
IACR Transactions on Symmetric Cryptology, 2020 A forkcipher is a keyed, tweakable function mapping an n-bit input to a 2nbit output, which is equivalent to concatenating two outputs from two permutations.
Hwigyeom Kim +2 more
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Weak Tweak-Keys for the CRAFT Block Cipher
IACR Transactions on Symmetric Cryptology, 2022 CRAFT is a lightweight tweakable Substitution-Permutation-Network (SPN) block cipher optimized for efficient protection of its implementations against Differential Fault Analysis (DFA) attacks.
Gregor Leander, Shahram Rasoolzadeh
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Improved Rectangle Attacks on SKINNY and CRAFT
IACR Transactions on Symmetric Cryptology, 2021 The boomerang and rectangle attacks are adaptions of differential cryptanalysis that regard the target cipher E as a composition of two sub-ciphers, i.e., E = E1 ∘ E0, to construct a distinguisher for E with probability p2q2 by concatenating two short ...
Hosein Hadipour +2 more
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Re-Keying Scheme Revisited: Security Model and Instantiations
Applied Sciences, 2019 The re-keying scheme is a variant of the symmetric encryption scheme where a sender (respectively, receiver) encrypts (respectively, decrypts) plaintext with a temporal session key derived from a master secret key and publicly-shared randomness.
Yuichi Komano, Shoichi Hirose
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Improved Meet-in-the-Middle Preimage Attacks against AES Hashing Modes
IACR Transactions on Symmetric Cryptology, 2020 Hashing modes are ways to convert a block cipher into a hash function, and those with AES as the underlying block cipher are referred to as AES hashing modes.
Zhenzhen Bao +4 more
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HCTR+: An Optimally Secure TBC-Based Accordion Mode
IACR Transactions on Symmetric CryptologyThe design of tweakable wide-block ciphers has advanced significantly over the past two decades. This evolution began with the wide-block cipher by Naor and Reingold.
Nilanjan Datta +4 more
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Clustering Related-Tweak Characteristics: Application to MANTIS-6
IACR Transactions on Symmetric Cryptology, 2018 The TWEAKEY/STK construction is an increasingly popular approach for designing tweakable block ciphers that notably uses a linear tweakey schedule. Several recent attacks have analyzed the implications of this approach for differential cryptanalysis and ...
Maria Eichlseder, Daniel Kales
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Practical Key-Recovery Attack on MANTIS5
IACR Transactions on Symmetric Cryptology, 2017 MANTIS is a lightweight tweakable block cipher published at CRYPTO 2016. In addition to the full 14-round version, MANTIS7, the designers also propose an aggressive 10-round version, MANTIS5.
Christoph Dobraunig +3 more
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