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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The MALICIOUS Framework: Embedding Backdoors into Tweakable Block Ciphers [PDF]
Lecture Notes in Computer Science, 2020 Inserting backdoors in encryption algorithms has long seemed like a very interesting, yet difficult problem. Most attempts have been unsuccessful for symmetric-key primitives so far and it remains an open problem how to build such ciphers. In this work,
Thomas Peyrin +2 more
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Tweakable Block Ciphers Secure Beyond the Birthday Bound in the Ideal Cipher Model [PDF]
Lecture Notes in Computer Science, 2018 We propose a new construction of tweakable block ciphers from standard block ciphers. Our construction, dubbed XHX2, is the cascade of two independent XHX block ciphers, so it makes two call to the underlying block cipher using tweak-dependent keys.
Jooyoung Lee, Lee Jooyoung
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Lightweight Authenticated Encryption Mode of Operation for Tweakable Block Ciphers
Transactions on Cryptographic Hardware and Embedded Systems, 2019 The use of a small block length is a common strategy when designing lightweight (tweakable) block ciphers (TBCs), and several 64-bit primitives have been proposed.
Yusuke Naito, Takeshi Sugawara
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Provable Security of (Tweakable) Block Ciphers Based on Substitution-Permutation Networks [PDF]
Lecture Notes in Computer Science, 2018 peer reviewedSubstitution-Permutation Networks (SPNs) refer to a family of constructions which build a wn-bit block cipher from n-bit public permutations (often called S-boxes), which alternate keyless and “local” substitution steps utilizing such S ...
Benoit Cogliati +2 more
exaly +5 more sources
Zero-Correlation Attacks on Tweakable Block Ciphers with Linear Tweakey Expansion [PDF]
IACR Transactions on Symmetric Cryptology, 2019 The design and analysis of dedicated tweakable block ciphers is a quite recent and very active research field that provides an ongoing stream of new insights.
Ralph Ankele +5 more
doaj +9 more sources
A Security Analysis of Deoxys and its Internal Tweakable Block Ciphers
IACR Transactions on Symmetric Cryptology, 2017 In this article, we provide the first independent security analysis of Deoxys, a third-round authenticated encryption candidate of the CAESAR competition, and its internal tweakable block ciphers Deoxys-BC-256 and Deoxys-BC-384.
Carlos Cid +4 more
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A General Construction of Tweakable Block Ciphers and Different Modes of Operations [PDF]
Lecture Notes in Computer Science, 2006 . This work builds on earlier work by Rogaway at Asiacrypt 2004 on tweakable block cipher (TBC) and modes of operations. Our first contribution is to generalize Rogaway’s TBC construction by working over a ring R and by the use of a masking sequence of ...
Debrup Chakraborty +2 more
exaly +4 more sources
On rate-1 and beyond-the-birthday bound secure online ciphers using tweakable block ciphers
Cryptography and Communications, 2018 Recently, Andreeva et al. showed that online ciphers are actually equivalent to arbitrary tweak length (ATL) tweakable block ciphers (TBCs). Within this result they gave a security preserving generic conversion from ATL TBCs to online ciphers.
Ashwin Jha +2 more
exaly +4 more sources
Generalized Feistel Structures Based on Tweakable Block Ciphers
IACR Transactions on Symmetric Cryptology, 2022 A generalized Feistel structure (GFS) is a classical approach to construct a block cipher from pseudorandom functions (PRFs). Coron et al. at TCC 2010 instantiated a Feistel structure with a tweakable block cipher (TBC), and presented its provable ...
Kazuki Nakaya, Tetsu Iwata
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