Blockchain-based Transparency Framework for Privacy Preserving Third-party Services
release_nzdbrjdatrfgnlzo3v57go6tlm
by
Runhua Xu, Chao Li, James Joshi
2022
Abstract
Increasingly, information systems rely on computational, storage, and network
resources deployed in third-party facilities such as cloud centers and edge
nodes. Such an approach further exacerbates cybersecurity concerns constantly
raised by numerous incidents of security and privacy attacks resulting in data
leakage and identity theft, among others. These have, in turn, forced the
creation of stricter security and privacy-related regulations and have eroded
the trust in cyberspace. In particular, security-related services and
infrastructures, such as Certificate Authorities (CAs) that provide digital
certificate services and Third-Party Authorities (TPAs) that provide
cryptographic key services, are critical components for establishing trust in
crypto-based privacy-preserving applications and services. To address such
trust issues, various transparency frameworks and approaches have been recently
proposed in the literature. This paper proposes TAB framework that provides
transparency and trustworthiness of third-party authority and third-party
facilities using blockchain techniques for emerging crypto-based
privacy-preserving applications. TAB employs the Ethereum blockchain as the
underlying public ledger and also includes a novel smart contract to automate
accountability with an incentive mechanism that motivates users to participate
in auditing, and punishes unintentional or malicious behaviors. We implement
TAB and show through experimental evaluation in the Ethereum official test
network, Rinkeby, that the framework is efficient. We also formally show the
security guarantee provided by TAB, and analyze the privacy guarantee and
trustworthiness it provides.
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