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A Conditional Privacy Preserving Authentication and Multi Party Group Key Establishment Scheme for Real-Time Application in VANETs
Password Authentication VANET Group-Key generation
2019/9/19
Vehicular Ad-hoc Networks (VANETs) are a cardinal part of intelligent transportation system (ITS) which render various services in terms of traffic and transport management. The VANET is used to manag...
Towards Instantiating the Algebraic Group Model
Public-key cryptography algebraic group model generic group model
2019/9/16
The Generic Group Model (GGM) is one of the most important tools for analyzing the hardness of a cryptographic problem. Although a proof in the GGM provides a certain degree of confidence in the probl...
Succinct Arguments for Bilinear Group Arithmetic: Practical Structure-Preserving Cryptography
NIZK short proofs
2019/8/30
In their celebrated work, Groth and Sahai [EUROCRYPT'08, SICOMP' 12] constructed non-interactive zero-knowledge (NIZK) proofs for general bilinear group arithmetic relations, which spawned the entire ...
Blind Schnorr Signatures in the Algebraic Group Model
Schnorr signatures blind signatures algebraic group model
2019/8/2
We study the security of schemes related to Schnorr signatures in the algebraic group model (AGM) proposed by Fuchsbauer, Kiltz, and Loss (CRYPTO 2018), where the adversary can only compute new group ...
General Linear Group Action on Tensors: A Candidate for Post-Quantum Cryptography
Group actions isomorphism problems signature schemes
2019/6/12
Starting from the one-way group action framework of Brassard and Yung (Crypto '90), we revisit building cryptography based on group actions. Several previous candidates for one-way group actions no lo...
Group-homomorphic Secret Sharing Schemes Are Group-characterizable with Normal Subgroups
homomorphic secret sharing schemes group-characterizable distribution quasi-uniform distribution
2019/5/29
A group-characterizable random variable [Chan and Yeung 2002] is induced by a joint distribution on the (left) cosets of some subgroups of a main group. A homomorphic secret sharing scheme [Benaloh 19...
CSI-FiSh: Efficient Isogeny based Signatures through Class Group Computations
Isogeny-based cryptography digital signature class group
2019/5/21
In this paper we report on a new record class group computation of an imaginary quadratic field having 154-digit discriminant, surpassing the previous record of 130 digits. This class group is central...
Revisiting Post-Compromise Security Guarantees in Group Messaging
post-compromise security forward secrecy group messaging protocols
2019/5/13
Modern secure messaging protocols such as Signal can offer strong security guarantees, in particular Post-Compromise Security (PCS). The core PCS mechanism in these protocols is inherently pairwise, w...
Efficient Message Authentication Codes with Combinatorial Group Testing
Message authentication code Combinatorial group testing Data corruption
2019/4/23
Message authentication code, MAC for short, is a symmetric-key cryptographic function for authenticity. A standard MAC verification only tells whether the message is valid or invalid, and thus we can ...
Constant-Round Group Key Exchange from the Ring-LWE Assumption
Group key exchange Ring learning with errors Post-quantum cryptography
2019/4/22
Group key-exchange protocols allow a set of N parties to agree on a shared, secret key by communicating over a public network. A number of solutions to this problem have been proposed over the years, ...
Privado: Privacy-Preserving Group-based Advertising using Multiple Independent Social Network Providers
Unlinkability Privacy Advertising
2019/4/11
Online Social Networks (OSNs) offer free storage and social networking services through which users can communicate personal information with one another. The personal information of the users collect...
Practical Supersingular Isogeny Group Key Agreement
Group key agreement isogenies post-quantum cryptography
2019/4/3
We present the first quantum-resistant nn-party key agreement scheme based on supersingular elliptic curve isogenies. We show that the scheme is secure against quantum adversaries, by providing a secu...
Proper Usage of the Group Signature Scheme in ISO/IEC 20008-2
Group signature Cryptanalysis ISO/IEC 20008-2 SGX
2019/3/18
In ISO/IEC 20008-2, several anonymous digital signature schemes are specified. Among these, the scheme denoted as Mechanism 6, is the only plain group signature scheme that does not aim at providing a...
The Distinction Between Fixed and Random Generators in Group-Based Assumptions
Diffie-Hellman preprocessing point obfuscation
2019/3/1
There is surprisingly little consensus on the precise role of the generator g in group-based assumptions such as DDH. Some works consider g to be a fixed part of the group description, while others ta...
Group Signatures without NIZK: From Lattices in the Standard Model
Group signatures Lattices Attribute-based signatures
2019/2/28
In a group signature scheme, users can anonymously sign messages on behalf of the group they belong to, yet it is possible to trace the signer when needed. Since the first proposal of lattice-based gr...