Agora: A Privacy-Aware Data Marketplace

【Author】 Koutsos, Vlasis; Papadopoulos, Dimitrios; Chatzopoulos, Dimitris; Tarkoma, Sasu; Hui, Pan

【Source】IEEE TRANSACTIONS ON DEPENDABLE AND SECURE COMPUTING

【影响因子】6.791

【Abstract】We propose Agora, the first blockchain-based data marketplace that enables multiple privacy-concerned parties to get compensated for contributing and exchanging data, without relying on a trusted third party during the exchange. Agora achieves data privacy, output verifiability, and atomicity of payments by leveraging cryptographic techniques, and is designed as a decentralized application via smart contracts. Particularly, data generators provide encrypted data to data brokers who use a functional secret key to learn nothing but the output of a specific, agreed upon, function over the raw data. Data consumers can purchase decrypted outputs from the brokers, accompanied by corresponding proofs of correctness. We implement a working prototype of Agora on Ethereum and experimentally evaluate its performance and deployment costs. As a core building block of Agora, we propose a new functional encryption scheme with additional public parameters that operate as a trust anchor for verifying decrypted results.

【Keywords】Generators; Iron; Smart contracts; Data privacy; Encryption; Cryptography; Blockchains; Data marketplace; functional encryption; blockchain

【发表时间】2022 1-Nov

【收录时间】2022-11-26

【文献类型】理论模型

【主题类别】

区块链应用-虚拟经济-数字经济