$mathsf{Skye}$: A Fast KDF based on Expanding PRF and its Application to Signal
A Key Derivation Function KDF generates a uniform and highly random key-stream from weakly random key material. KDFs are broadly...
Global Security News
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A flexible Snark via the monomial basis
We describe a pairing-based SNARK with a universal updateable CRS that can be instantiated with any pairing-friendly curve endowed with...
Private Proof-of-Stake Blockchains using Differentially-private Stake Distortion
Safety, liveness, and privacy are three critical properties for any private proof-of-stake (PoS) blockchain. However, prior work (SP'21) has shown...
Generation of two ”independent” points on an elliptic curve of $j$-invariant $neq 0, 1728$
This article is dedicated to a new generation method of two ``independent'' $mathbb{F}_{!q}$-points $P_0$, $P_1$ on almost any ordinary elliptic...
History-Free Sequential Aggregate Signatures from Generic Trapdoor Functions
A sequential aggregate signature (SAS) scheme allows multiple users to sequentially combine their respective signatures in order to reduce communication...
Breaking the power-of-two barrier: noise estimation for BGV in NTT-friendly rings
The Brakerski-Gentry-Vaikuntanathan (BGV) scheme is a Fully Homomorphic Encryption (FHE) cryptosystem based on the Ring Learning With Error (RLWE) problem....
Coefficient Grouping for Complex Affine Layers
Designing symmetric-key primitives for applications in Fully Homomorphic Encryption (FHE) has become important to address the issue of the ciphertext...
Too Many Hints – When LLL Breaks LWE
All modern lattice-based schemes build on variants of the LWE problem. Information leakage of the LWE secret $mathbf s in...
Quantum Attacks on Type-1 Generalized Feistel Schemes
Generalized Feistel schemes (GFSs) are extremely important and extensively researched cryptographic schemes. In this paper, we investigate the security of...
Exact Security Analysis of ASCON
The Ascon cipher suite, offering both authenticated encryption with associated data (AEAD) and hashing functionality, has recently emerged as the...