搜索结果: 1-15 共查到“军事学 blockchains”相关记录28条 . 查询时间(0.05 秒)
Traceable and linkable ring signatures, traceable range proofs and applications on regulatable privacy-preserving blockchains
regulatable blockchain privacy preserving decentralization
2019/8/19
Privacy protection has been extensively studied in the current blockchain research field. As representations, Monero and Zerocash have realized completely anonymous and amount-hiding transactions. How...
The Rush Dilemma: Attacking and Repairing Smart Contracts on Forking Blockchains
blockchain forks smart contracts secure computation
2019/8/6
We investigate the security of smart contracts within a blockchain that can fork (as Bitcoin and Ethereum). In particular, we focus on multi-party computation (MPC) protocols run on-chain with the aid...
TICK: Tiny Client for Blockchains
blockchain lightweight client zero-confirmation trasnactions
2019/7/15
Currently, a lightweight blockchain client cannot verify a transaction directly. Rather, it generally considers a transaction to be valid and finalized if there are six confirmations on this transacti...
Arcula: A Secure Hierarchical Deterministic Wallet for Multi-asset Blockchains
Hierarchical Deterministic Wallet Hierarchical Key Assignment Bitcoin Blockchain
2019/6/19
This work presents Arcula, a new design for hierarchical deterministic wallets that significantly improves the state of the art. Arcula is built on top of provably secure cryptographic primitives. It ...
Afgjort -- A Semi-Synchronous Finality Layer for Blockchains
blockchain finality Byzantine agreement
2019/5/21
Most existing blockchains either rely on a Nakamoto-style of consensus, where the chain can fork and produce rollbacks, or on a committee-based Byzantine fault tolerant (CBFT) consensus, where no roll...
Fine-Grained and Controlled Rewriting in Blockchains: Chameleon-Hashing Gone Attribute-Based
Chameleon-Hash Implementation Blockchain
2019/4/23
Blockchain technologies recently received a considerable amount of attention. While the initial focus was mainly on the use of blockchains in the context of cryptocurrencies such as Bitcoin, applicati...
Secure Computation of the $k^\text{th}$-ranked Integer on Blockchains
applications secret sharing zero knowledge
2019/3/13
We focus on securely computing the kthkth-ranked integer in a sequence of integers distributed among nn parties, e.g., the largest or smallest integer or the median. Our specific objective is low inte...
We show that classical rewinding-based simulation techniques used in many security proofs fail against blockchain-active adversaries that have read and post access to a global blockchain. In particula...
Publicly Verifiable Proofs from Blockchains
Non-interactive Witness Indistinguishability Blockchain public verifiability NIZK
2019/1/26
A proof system is publicly verifiable, if anyone, by looking at the transcript of the proof, can be convinced that the corresponding theorem is true. Public verifiability is important in many applicat...
Uncontrolled Randomness in Blockchains: Covert Bulletin Board for Illicit Activities
Blockchain Steganography Covert Broadcast Channels
2018/12/11
The blockchain technology represents a new paradigm to realize persistent distributed ledgers globally. While the blockchain technology is promising in a great number of fields, it can be abused to c...
Batching Techniques for Accumulators with Applications to IOPs and Stateless Blockchains
accumulators zero knowledge commitments
2018/12/11
We present batching techniques for cryptographic accumulators and vector commitments in groups of unknown order. Our techniques are tailored for decentralized settings where no trusted accumulator man...
PoTS - A Secure Proof of TEE-Stake for Permissionless Blockchains
Permissionless Blockchain Proof of Stake Security
2018/11/29
Proof-of-Stake (PoS) protocols have been actively researched for the past few years. PoS finds direct applicability in permissionless blockchain platforms and emerges as one of the strongest candidate...
Proof-of-stake (PoS) protocols are emerging as one of the most promising alternative to the wasteful proof-of-work (PoW) protocols for consensus in Blockchains (or distributed ledgers).
Tendermint-core blockchains offer strong consistency (no forks) in an open system relying on two ingredients (i) a set of validators that generate blocks via a variant of Practical Byzantine Fault Tol...
We construct new multi-signature schemes that provide new functionality. Our schemes are designed to reduce the size of the Bitcoin blockchain, but are useful in many other settings where multi-signat...