Proof of Storage-Time: Efficiently Checking Continuous Data Availability
Document Type
Conference Proceeding
Publication Date
1-1-2020
Abstract
A high-quality outsourced storage service is crucial for many existing applications. For example, hospitals and data centers need to guarantee the availability of their systems to perform routine daily activities. Such a system should protect users against downtime and ensure data availability over time. Continuous data availability is a critical property to measure the quality of an outsourced storage service, which implies that outsourced data is continuously available to the server during the entire storage period. We formally study the Proof of Storage-Time (PoSt), the notion initially proposed in the Filecoin whitepaper, which enables a verifier to audit the continuous data availability of an outsourced storage service. We provide a formal security model of PoSt and generic constructions that are proven secure under our definition. Moreover, our concrete instantiation can yield a PoSt protocol with an extremely efficient verification: a single hash computation to verify a proof of size around 200 bits. This makes our scheme applicable even in the decentralized storage marketplace enabled by blockchain.
Identifier
85130445066 (Scopus)
ISBN
[1891562614, 9781891562617]
Publication Title
27th Annual Network and Distributed System Security Symposium Ndss 2020
External Full Text Location
https://doi.org/10.14722/ndss.2020.24427
Recommended Citation
Ateniese, Giuseppe; Chen, Long; Etemad, Mohammad; and Tang, Qiang, "Proof of Storage-Time: Efficiently Checking Continuous Data Availability" (2020). Faculty Publications. 5614.
https://digitalcommons.njit.edu/fac_pubs/5614
