On the Composition of Single-Keyed Tweakable Even-Mansour for Achieving BBB Security
نویسندگان
چکیده
منابع مشابه
Multi-key Analysis of Tweakable Even-Mansour
The tweakable Even-Mansour construction generalizes the conventional Even-Mansour scheme through replacing round keys by strings derived from a master key and a tweak. Besides providing plenty of inherent variability, such a design builds a tweakable block cipher from some lower level primitive. In the present paper, we evaluate the multi-key security of TEM-1, one of the most commonly used one...
متن کاملXPX: Generalized Tweakable Even-Mansour with Improved Security Guarantees
We present XPX, a tweakable blockcipher based on a single permutation P . On input of a tweak (t11, t12, t21, t22) ∈ T and a message m, it outputs ciphertext c = P (m⊕∆1)⊕∆2, where ∆1 = t11k⊕t12P (k) and ∆2 = t21k⊕t22P (k). Here, the tweak space T is required to satisfy a certain set of trivial conditions (such as (0, 0, 0, 0) 6∈ T ). We prove that XPX with any such tweak space is a strong twea...
متن کاملBeyond-Birthday-Bound Security for Tweakable Even-Mansour Ciphers with Linear Tweak and Key Mixing
The iterated Even-Mansour construction defines a block cipher from a tuple of public n-bit permutations (P1, . . . , Pr) by alternatively xoring some n-bit round key ki, i = 0, . . . , r, and applying permutation Pi to the state. The tweakable Even-Mansour construction generalizes the conventional Even-Mansour construction by replacing the n-bit round keys by n-bit strings derived from a master...
متن کاملOn the Provable Security of the Tweakable Even-Mansour Cipher Against Multi-Key and Related-Key Attacks
Cogliati et al. introduced the tweakable Even-Mansour cipher constructed from a single permutation and an almost-XORuniversal (AXU) family of hash functions with tweak and key schedule. Most of previous papers considered the security of the (iterated) tweakable Even-Mansour cipher in the single-key setting. In this paper, we focus on the security of the tweakable Even-Mansour cipher in the mult...
متن کاملThe Related-Key Security of Iterated Even-Mansour Ciphers
The simplicity and widespread use of blockciphers based on the iterated Even–Mansour (EM) construction has sparked recent interest in the theoretical study of their security. Previous work has established their strong pseudorandom permutation and indifferentiability properties, with some matching lower bounds presented to demonstrate tightness. In this work we initiate the study of the EM ciphe...
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ژورنال
عنوان ژورنال: IACR Transactions on Symmetric Cryptology
سال: 2020
ISSN: 2519-173X
DOI: 10.46586/tosc.v2020.i2.1-39