Results 21 to 30 of about 4,552,353 (162)
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
doaj +1 more source
Tight Security of TNT: Reinforcing Khairallah\u27s Birthday-bound Attack [PDF]
, 2023 In a recent paper, Khairallah demonstrated a birthday-bound attack on TNT, thereby invalidating its (beyond-the-birthday-bound) CCA security claims. In this short note, we reestablish a birthday-bound CCA security bound for TNT.
Ashwin Jha, Abishanka Saha, Mridul Nandi
core +1 more source
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
doaj +1 more source
Tight Security Analysis of EHtM MAC
IACR Transactions on Symmetric Cryptology, 2017 The security of a probabilistic Message Authentication Code (MAC) usually depends on the uniqueness of the random salt which restricts the security to birthday bound of the salt size due to the collision on random salts (e.g XMACR).
Avijit Dutta, Ashwin Jha, Mridul Nandi
doaj +1 more source
AES-LBBB: AES Mode for Lightweight and BBB-Secure Authenticated Encryption
Transactions on Cryptographic Hardware and Embedded Systems, 2021 In this paper, a new lightweight authenticated encryption scheme AESLBBB is proposed, which was designed to provide backward compatibility with advanced encryption standard (AES) as well as high security and low memory.
Yusuke Naito +2 more
doaj +1 more source
LM-DAE: Low-Memory Deterministic Authenticated Encryption for 128-bit Security
IACR Transactions on Symmetric Cryptology, 2020 This paper proposes a new lightweight deterministic authenticated encryption (DAE) scheme providing 128-bit security. Lightweight DAE schemes are practically important because resource-restricted devices sometimes cannot afford to manage a nonce properly.
Yusuke Naito +2 more
doaj +3 more sources
On the Composition of Single-Keyed Tweakable Even-Mansour for Achieving BBB Security
IACR Transactions on Symmetric Cryptology, 2020 Observing the growing popularity of random permutation (RP)-based designs (e.g, Sponge), Bart Mennink in CRYPTO 2019 has initiated an interesting research in the direction of RP-based pseudorandom functions (PRFs).
Avik Chakraborti +3 more
doaj +1 more source
Single Key Variant of PMAC_Plus
IACR Transactions on Symmetric Cryptology, 2017 At CRYPTO 2011, Yasuda proposed the PMAC_Plus message authentication code based on an n-bit block cipher. Its design principle inherits the well known PMAC parallel network with a low additional cost.
Nilanjan Datta +4 more
doaj +1 more source
Efficient Side-Channel Secure Message Authentication with Better Bounds
IACR Transactions on Symmetric Cryptology, 2020 We investigate constructing message authentication schemes from symmetric cryptographic primitives, with the goal of achieving security when most intermediate values during tag computation and verification are leaked (i.e., mode-level leakage-resilience).
Chun Guo +3 more
doaj +1 more source
Improved Security Bound of (E/D)WCDM
IACR Transactions on Symmetric Cryptology, 2021 In CRYPTO’16, Cogliati and Seurin proposed a block cipher based nonce based MAC, called Encrypted Wegman-Carter with Davies-Meyer (EWCDM), that gives 2n/3 bit MAC security in the nonce respecting setting and n/2 bit security in the nonce misuse setting ...
Nilanjan Datta +2 more
doaj +1 more source