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In cryptoeconomic protocols, financial deposits are fundamental to their security. Protocol designers and their agents face a trade-off when choosing the deposit size. While substantial deposits might...
Cryptanalysis of Curl-P and Other Attacks on the IOTA Cryptocurrency
cryptocurrencies digital signatures hash functions
2019/4/3
We present attacks on the cryptography formerly used in the IOTA blockchain, including under certain conditions the ability to forge signatures. We developed practical attacks on IOTA's cryptographic ...
Edrax: A Cryptocurrency with Stateless Transaction Validation
cryptocurrency blockchain stateless transaction validation
2018/11/6
We present Edrax, a general architecture for building cryptocurrencies with stateless transaction validation. In Edrax, all cryptocurrency nodes, such as miners and validating nodes, can validate inco...
Fast Secure Multiparty ECDSA with Practical Distributed Key Generation and Applications to Cryptocurrency Custody
ECDSA threshold cryptography
2018/11/5
ECDSA is a standardized signing algorithm that is widely used in TLS, code signing, cryptocurrency and more. Due to its importance, the problem of securely computing ECDSA in a distributed manner (kno...
Issue, Trade, Redeem: Crossing Systems Bounds with Cryptocurrency-Backed Tokens
Bitcoin Ethereum blockchain
2018/7/9
The ecosystem of cryptocurrencies has been steadily growing since the introduction of Bitcoin, the first decentralised digital currency. While the notion of trustless asset exchange lies at the core o...
In the past years, the security of Bitcoin-like protocols has been intensively studied. However, previous investigations are mainly focused on the single-mode version of Bitcoin protocol, where the pr...
This paper is devoted to the study of transaction fees in massively replicated open blockchain systems. In such systems, like Bitcoin, a snapshot of current state required for the validation of transa...
Designing Proof of Transaction Puzzles for Cryptocurrency
proof of transaction sequential aggregate signature blockchain
2017/12/25
One of the Bitcoin's innovations is the Proof of Work puzzle (aka scratch-off puzzle) as a consensus protocol for anonymous networks without pre-established PKI. Bitcoins based on the Proof of Work pu...
This work shows that weighted majority voting games occur in cryptocurrencies. In particular, two such games are highlighted. The first game, which we call the Rule Game, pertains to the scenario wher...
Tesseract: Real-Time Cryptocurrency Exchange using Trusted Hardware
cryptocurrency fairness consensus
2017/11/29
We propose Tesseract, a secure real-time cryptocurrency exchange service. Centralized exchange designs are vulnerable to theft of funds, while decentralized exchanges cannot offer real-time cross-chai...
RingCT 2.0: A Compact Accumulator-Based (Linkable Ring Signature) Protocol for Blockchain Cryptocurrency Monero
Cryptographic Currency Anonymity
2017/9/25
In this work, we initially study the necessary properties and security requirements of Ring Confidential Transaction (RingCT) protocol deployed in the popular anonymous cryptocurrency Monero. Firstly,...
TwinsCoin: A Cryptocurrency via Proof-of-Work and Proof-of-Stake
cryptocurrency blockchain implementation
2017/3/9
We design and implement TwinsCoin, the first cryptocurrency based on a provably secure and scalable public blockchain design using both proof-of-work and proof-of-stake mechanisms. Different from the ...
SPECTRE: A Fast and Scalable Cryptocurrency Protocol
cryptocurrencies Bitcoin distributed algorithms
2016/12/29
A growing body of research on Bitcoin and other permissionless cryptocurrencies that utilize Nakamoto's blockchain has shown that they do not easily scale to process a high throughput of transactions,...
Designing Proof of Human-work Puzzles for Cryptocurrency and Beyond
Virginia Commonwealth University
2016/2/23
We introduce the novel notion of a Proof of Human-work (PoH) and present the first distributed
consensus protocol from hard Artificial Intelligence problems. As the name suggests, a PoH is a proof
t...
PoS Cryptocurrency wtih No Blockchain
cryptocurrency bitcoin pos blockchai Cryptocurrency systems
2016/1/23
There are some alternative Cryptocurrency systems which claim that they are based on PoS are actually based on PoSTW which denotes the Proof of Stake(coin), Time(day) and Work(hashing), while the ot...