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Subversion-Resistant Commitment Schemes: Definitions and Constructions
Commitment schemes subversion security common reference string model
2019/9/23
A commitment scheme allows a committer to create a commitment to a secret value, and later may open and reveal the secret value in a verifiable manner. In the common reference string model, commitment...
UC-Commitment Schemes with Phase-Adaptive Security from Trapdoor Functions
Commitment Universal Composability Global Random Oracle
2019/5/21
We propose a generic framework for perfectly hiding UC-Commitment schemes in the Global Random Oracle model of Canetti \textit{el at.} (CCS 14). The main building block of our construction is a novel ...
We define a new UC functionality (DL-extractable commitment scheme) that allows committer to open a commitment to a group element gxgx; however, the simulator will be able to extract its discrete loga...
Functional Commitment Schemes: From Polynomial Commitments to Pairing-Based Accumulators from Simple Assumptions
Commitment schemes functional commitments accumulators
2016/12/10
We propose a construction of functional commitment (FC) for linear functions based on constant-size assumptions in composite order groups endowed with a bilinear map. The construction has commitments ...
Analysis and Improvement of Lindell's UC-Secure Commitment Schemes
cryptographic protocols / UC Commitment
2013/4/18
In 2011, Lindell proposed an efficient commitment scheme, with a non-interactive opening algorithm, in the Universal Composability (UC) framework. He recently acknowledged a bug in its security analy...
A Framework for Non-Interactive Instance-Dependent Commitment Schemes (NIC)
cryptography zero knowledge instant-dependent commitment schemes
2009/9/27
Zero-knowledge protocols are often studied through specific problems, like GRAPH-ISOMORPHISM.
In many cases this approach prevents an important level of abstraction and leads to limited results,
whe...
A Framework for Non-Interactive Instance-Dependent Commitment Schemes (NIC)
cryptography zero knowledge instant-dependent commitment schemes
2009/9/22
Zero-knowledge protocols are often studied through specific problems, like GRAPH-ISOMORPHISM.
In many cases this approach prevents an important level of abstraction and leads to limited results,
whe...
A generalized Framework for Crisp Commitment Schemes
Cryptography Commitment Schemes Discrete Mathematics
2009/6/12
Crisp Commitment schemes are very useful building blocks in the design of high-level
cryptographic protocols. They are used as a mean of flipping fair coins between two players and
others. In this p...
Existing commitment schemes were addressed under the classic two-party scenario.
However, popularity of the secure multi-party computation in today's lush network commu-
nication is motivating us to...
Perfect Hiding and Perfect Binding Universally Composable Commitment Schemes with Constant Expansion Factor
Perfect Hiding Perfect Binding Universally Composable Commitment Schemes Constant Expansion Factor
2009/4/16
Perfect Hiding and Perfect Binding Universally Composable Commitment Schemes with Constant Expansion Factor
Non-interactive and Reusable Non-malleable Commitment Schemes
Commitment non-malleability universal composability
2009/4/9
We consider non-malleable (NM) and universally composable (UC)
commitment schemes in the common reference string (CRS) model.
We show how to construct non-interactive NM commitments that re-
main n...