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Efficient Search for Optimal Diffusion Layers of Generalized Feistel Networks
Diffusion Round Feistel Permutations
2019/5/23
The Feistel construction is one of the most studied ways of building block ciphers. Several generalizations were then proposed in the literature, leading to the Generalized Feistel Network, where the ...
Linear Equivalence of Block Ciphers with Partial Non-Linear Layers: Application to LowMC
Block cipher LowMC Picnic signature algorithm linear equivalence
2018/8/28
LowMC is a block cipher family that is optimized for practical instantiations of multi-party computation, fully homomorphic encryption, and zero-knowledge proofs. It was designed in 2015 by Albrecht e...
Design of Lightweight Linear Diffusion Layers from Near-MDS Matrices
lightweight cryptography diffusion layer near-MDS matrix
2017/3/6
Near-MDS matrices provide better trade-offs between security and efficiency compared to constructions based on MDS matrices, which are favored for hardware-oriented designs. We present new designs of ...
MILP-Aided Bit-Based Division Property for Primitives with Non-Bit-Permutation Linear Layers
MILP-aided bit-based division property AES LED
2016/12/10
At ASIACRYPT 2016, Xiang et al. applied MILP method to search integral distinguisher based on division property. This method handled the huge time and memory complexities which had constituted the mai...
Direct Construction of Lightweight Rotational-XOR MDS Diffusion Layers
Lightweight Cryptography MDS Diffusion Layers Bit-wise Circulant Matrices
2016/12/7
As a core component of Substitution-Permutation Networks, diffusion layer is mainly introduced by matrices from maximum distance separable (MDS) codes. Surprisingly, up to now, most constructions of M...
Designing Optimal Implementations of Linear Layers (Full Version)
Linear Layer XOR Count Equivalence Relation
2016/12/7
Linear layer is a fundamental primitive for many aspects of information
technology. For information security, the performance of a linear layer depends on
two aspects: diffusion ability and implemen...
Diffusion layers are crucial components of symmetric
ciphers. These components, along with suitable
Sboxes, can make symmetric ciphers resistant against statistical
attacks like linear and differen...
Cryptanalysis of SP Networks with Partial Non-Linear Layers
Block cipher Lightweight Zorro
2016/1/23
Design of SP networks in which the non-linear layer is applied to only a part of the state in each round was suggested by Gérard et al.~at CHES 2013. Besides performance advantage on certain platforms...
Direct Construction of Recursive MDS Diffusion Layers using Shortened BCH Codes
Recursive MDS Diffusion Layers Shortened BCH Codes
2016/1/8
MDS matrices allow to build optimal linear diffusion layers in
block ciphers. However, MDS matrices cannot be sparse and usually have
a large description, inducing costly software/hardware implement...
Efficient MDS Diffusion Layers Through Decomposition of Matrices
Diffusion layer MDS matrix Symmetric cipher
2015/12/24
Diffusion layers are critical components of symmetric ciphers. MDS matrices are diffusion layers of maximal branch number which have been used in various symmetric ciphers. In this article, we examine...
Analysis of RC4 and Proposal of Additional Layers for Better Security Margin
Bias Cryptography Keystream
2009/6/9
In this paper, the RC4 Key Scheduling Algorithm (KSA) is theoretically studied to reveal
non-uniformity in the expected number of times each value of the permutation is touched by the indices
i, j. ...