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The LLL algorithm takes as input a basis of a Euclidean lattice, and, within a polynomial number of operations, it outputs another basis of the same lattice but consisting of rather short vectors. We ...
Post-Quantum Variants of ISO/IEC Standards: Compact Chosen Ciphertext Secure Key Encapsulation Mechanism from Isogenies
Post-quantum cryptosystems Isogeny-based cryptosystems CSIDH
2019/9/17
ISO/IEC standardizes several chosen ciphertext-secure key encapsulation mechanism (KEM) schemes in ISO/IEC 18033-2. However, all ISO/IEC KEM schemes are not quantum resilient. In this paper, we introd...
Card-based Cryptography Meets Formal Verification
secure multiparty computation card-based cryptography formal verification
2019/9/17
Card-based cryptography provides simple and practicable protocols for performing secure multi-party computation (MPC) with just a deck of cards. For the sake of simplicity, this is often done using ca...
Lucente Stabile Atkins (LSA) Cryptosystem (Unbreakable)
public-key cryptography quantum cryptography RSA
2019/9/16
The LSA cryptosystem is an asymmetric encryption algorithm which is based on both group and number theory that follows Kerckhoffs’s principle and relies on a specific case of Gauss’s Generalization of...
SPAE a mode of operation for AES on low-cost hardware
secret-key cryptography AES block ciphers
2019/9/16
We propose SPAE, a single pass, patent free, authenticated encryption with associated data (AEAD) for AES. The algorithm has been developped to address the needs of a growing trend in IoT systems: sto...
Side-Channel Countermeasures' Dissection and the Limits of Closed Source Security Evaluations
Side-Channel Attacks Security Evaluations Certification
2019/9/16
We take advantage of a recently published open source implementation of the AES protected with a mix of countermeasures against side-channel attacks to discuss both the challenges in protecting COTS d...
We introduce stochastic sandpile models which imitate numerous aspects of the practical behavior of the LLL algorithm with compelling accuracy. In addition, we argue that the physics and mathematics o...
On Perfect Correctness in (Lockable) Obfuscation
Obfuscation Lockable Obfuscation Perfect Correctness
2019/9/16
In a lockable obfuscation scheme a party takes as input a program PP, a lock value αα, a message mm and produces an obfuscated program P~P~. The obfuscated program can be evaluated on an input xx to l...
Compact and Scalable Arbitrary-centered Discrete Gaussian Sampling over Integers
Lattice-based crypto discrete Gaussian sampling implementation
2019/9/16
The arbitrary-centered discrete Gaussian sampler is a fundamental subroutine in implementing lattice trapdoor sampling algorithms. However, existing approaches typically rely on either a fast implemen...
Simple and Efficient KDM-CCA Secure Public Key Encryption
key dependent message security chosen ciphertext security
2019/9/16
We propose two efficient public key encryption (PKE) schemes satisfying key dependent message security against chosen ciphertext attacks (KDM-CCA security). The first one is KDM-CCA secure with respec...
A Critical Analysis of ISO 17825 (`Testing methods for the mitigation of non-invasive attack classes against cryptographic modules')
side-channel analysis leakage detection security certification
2019/9/16
The ISO standardisation of `Testing methods for the mitigation of non-invasive attack classes against cryptographic modules' (ISO/IEC 17825:2016) specifies the use of the Test Vector Leakage Assessmen...
Security Reductions for White-Box Key-Storage in Mobile Payments
White-box cryptography secure key storage hardware-binding
2019/9/16
The goal of white-box cryptography is to provide security even when the cryptographic implementation is executed in adversarially controlled environments. White-box implementations nowadays appear in ...
Bootstrapping Consensus Without Trusted Setup: Fully Asynchronous Distributed Key Generation
threshold cryptography distributed cryptography asynchronous consensus
2019/9/16
In this paper, we present the first fully asynchronous distributed key generation (ADKG) algorithm as well as the first distributed key generation algorithm that can create keys with a dual (f,2f+1)...
Quantum Algorithms for the Approximate k-List Problem and their Application to Lattice Sieving
approximate k-list problem cryptanalysis distributed computation
2019/9/16
The Shortest Vector Problem (SVP) is one of the mathematical foundations of lattice based cryptography. Lattice sieve algorithms are amongst the foremost methods of solving SVP. The asymptotically fas...
The Local Forking Lemma and its Application to Deterministic Encryption
Deterministic public-key encryption searchable encryption forking lemma
2019/9/16
We bypass impossibility results for the deterministic encryption of public-key-dependent messages, showing that, in this setting, the classical Encrypt-with-Hash scheme provides message-recovery secur...