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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...
Transparent Polynomial Commitment Scheme with Polylogarithmic Communication Complexity
polynomial commitments zero-knowledge proofs proximity testing
2019/9/16
We introduce novel efficient and transparent construction of the polynomial commitment scheme. A polynomial commitment scheme allows one side (the prover) to commit to a polynomial of predefined degre...
On the Commitment Capacity of Unfair Noisy Channels
Commitment capacity unconditionally secure cryptography unfair noisy channels
2019/5/28
Noisy channels are a valuable resource from a cryptographic point of view. They can be used for exchanging secret-keys as well as realizing other cryptographic primitives such as commitment and oblivi...
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...
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...
Efficient UC Commitment Extension with Homomorphism for Free (and Applications)
cryptographic protocols UC
2018/11/5
Homomorphic universally composable (UC) commitments allow for the sender to reveal the result of additions and multiplications of values contained in commitments without revealing the values themselve...
Unconditionally secure multi-party quantum commitment scheme
public-key cryptography quantum information
2017/12/19
A new unconditionally secure multi-party quantum commitment is proposed in this paperby encoding the committed message to the phase of a quantum state. Multi-party means that there are more than one r...
Efficient, Round-optimal, Universally-Composable Oblivious Transfer and Commitment Scheme with Adaptive Security
Oblivious Transfer Commitment Schemes Universal Composability
2017/12/1
Adaptive security embodies one of the strongest notions of security that allows an adversary to corrupt parties at any point during protocol execution and gain access to its internal state. Since it m...
Two-Round Concurrent Non-Malleable Commitment from Time-Lock Puzzles
Non-malleable Commitments Time-lock Puzzles Two-round
2017/3/27
Non-malleable commitment is a fundamental cryptographic tool for preventing man-in-the-middle attacks. Since its proposal by Dolev, Dwork, and Noar in 1991, a rich line of research has steadily reduce...
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 ...
Quantum Bit Commitment with Application in Quantum Zero-Knowledge Proof
quantum bit commitment quantum zero-knowledge unconditional study
2016/1/6
Watrous (STOC 2006) proved that plugging classical bit commitment scheme that is secure
against quantum attack into the GMW-type construction of zero-knowledge gives a classical
zero-knowledge proof...
An Unconditionally Hiding and Long-Term Binding Post-Quantum Commitment Scheme
unconditionally hiding commitments post-quantum lattice-based cryptography
2015/12/29
Commitment schemes are among cryptography’s most important
building blocks. Besides their basic properties, hidingness and
bindingness, for many applications it is important that the schemes applied...
Commitment and Oblivious Transfer in the Bounded Storage Model with Errors
Bounded storage model error correction commitment oblivious transfer
2015/12/22
In the bounded storage model the memory of the adversary is restricted, instead of its
computational power. With this different restriction it is possible to design protocols with
information-theore...
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...