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Decentralized Multi-authority Anonymous Authentication for Global Identities with Non-interactive Proofs
anonymous authentication attribute collusion attack
2019/6/14
We propose a decentralized multi-authority anonymous authentication scheme in which a prover and a verifier are non-interactive. We give two security definitions; resistance against collusion attacks ...
A Post-Quantum UC-Commitment Scheme in the Global Random Oracle Model from Code-Based Assumptions
Commitment Scheme Universal Composability
2019/2/27
In this work, we propose the first post-quantum UC-commitment scheme in the Global Random Oracle Model, where only one non-programmable random oracle is available. The security of our proposal is base...
Witness-Indistinguishable Arguments with $\Sigma$-Protocols for Bundled Witness Spaces and its Application to Global Identities
interactive proof sigma protocol witness indistinguishability
2018/8/16
We propose a generic construction of a Σ-protocol of commit-and-prove type, which is an \textsc{and}-composition of Σ-protocols on the statements that include a common commitment. Our protocol enables...
The Wonderful World of Global Random Oracles
random oracle model universal composability global random oracle
2018/3/6
The random-oracle model by Bellare and Rogaway (CCS'93) is an indispensable tool for the security analysis of practical cryptographic protocols. However, the traditional random-oracle model fails to g...
Universally Composable Authentication and Key-exchange with Global PKI
public-key infrastructure message authentication digital signatures key exchange
2016/1/9
Message authentication and key exchange are two of the most basic tasks of cryptography. Solutions
based on public-key infrastructure (PKI) are prevalent. Still, the state of the art in composable se...
Practical UC security with a Global Random Oracle
Efficient Secure 2PC UC-security Global Random Oracle
2016/1/6
We show that there exist commitment, zero-knowledge and general function evaluation protocols with universally composable security, in a model where all parties and all protocols have access to a sing...
Fair and Robust Multi-Party Computation using a Global Transaction Ledger
cryptographic protocols Global Transaction Ledger
2015/12/29
Classical results on secure multi-party computation (MPC) imply that fully secure computation,
including fairness (either all parties get output or none) and robustness (output delivery is
guarantee...
Keyless Signatures' Infrastructure: How to Build Global Distributed Hash-Trees
distributed system applications of hash functions public-key infrastructure high availability
2014/3/5
Keyless Signatures Infrastructure (KSI) is a globally distributed system for providing time-stamping and server-supported digital signature services. Global per-second hash trees are created and their...
Some results concerning global avalanche characteristics of two $q$-ary functions
functions avalanche characteristics
2014/3/7
The global avalanche characteristics criteria was first introduced by Zhou et al. (Inform. Sci. 180(2) (2010) 256-265). This article is concerned with some new bounds on global avalanche characteristi...
A Local-Global Approach to Solving Ideal Lattice Problems
shortest lattice vector problems closest lattice vector problems
2014/3/10
We construct an innovative SVP(CVP) solver for ideal lattices in case of any relative extension of number fields L/K of degree n where L is real(contained in R). The solver, by exploiting the relation...
Outline of a proposal responding to E.U. and U.S. calls for trustworthy global-scale IdM and CKM designs
secret-key cryptography / identity management key management
2012/3/30
In 2007, the E.U. FP6 SecurIST called for trustworthy international identity management (IdM) that was user-centric. In 2009, the U.S. Department of Homeland Security (DHS) called for trustworthy glob...
Outline of a proposal responding to E.U. and U.S. calls for trustworthy global-scale IdM and CKM designs
identity management key management
2011/1/20
In 2007, the E.U. FP6 SecurIST called for trustworthy international identity management (IdM) that was user-centric. In 2009, the U.S. Department of Homeland Security (DHS) called for trustworthy glob...
In their best-selling book, The Coming Conflict with China, Richard Bernstein and Ross H. Munro sketch out a frightening but all too plausible scenario. It is 2004; after a major, decade-long campaign...
Universally Composable Security with Global Setup
Universally Composable Security Global Setup
2009/1/4
Cryptographic protocols are often designed and analyzed under some trusted setup assumptions,
namely in settings where the participants have access to global information that is trusted
to have some...