Visible to the public Full Accounting for Verifiable Outsourcing

TitleFull Accounting for Verifiable Outsourcing
Publication TypeConference Paper
Year of Publication2017
AuthorsWahby, Riad S., Ji, Ye, Blumberg, Andrew J., shelat, abhi, Thaler, Justin, Walfish, Michael, Wies, Thomas
Conference NameProceedings of the 2017 ACM SIGSAC Conference on Computer and Communications Security
PublisherACM
Conference LocationNew York, NY, USA
ISBN Number978-1-4503-4946-8
Keywordscomposability, hardware design templates, interactive proofs, probabilistic proofs, pubcrawl, trustworthiness, trustworthy hardware, verifiable asics, verifiable computation, verifiable outsourcing
AbstractSystems for verifiable outsourcing incur costs for a prover, a verifier, and precomputation; outsourcing makes sense when the combination of these costs is cheaper than not outsourcing. Yet, when prior works impose quantitative thresholds to analyze whether outsourcing is justified, they generally ignore prover costs. Verifiable ASICs (VA)—in which the prover is a custom chip—is the other way around: its cost calculations ignore precomputation. This paper describes a new VA system, called Giraffe; charges Giraffe for all three costs; and identifies regimes where outsourcing is worthwhile. Giraffe's base is an interactive proof geared to data-parallel computation. Giraffe makes this protocol asymptotically optimal for the prover and improves the verifier's main bottleneck by almost 3x, both of which are of independent interest. Giraffe also develops a design template that produces hardware designs automatically for a wide range of parameters, introduces hardware primitives molded to the protocol's data flows, and incorporates program analyses that expand applicability. Giraffe wins even when outsourcing several tens of sub-computations, scales to 500x larger computations than prior work, and can profitably outsource parts of programs that are not worthwhile to outsource in full.
URLhttp://doi.acm.org/10.1145/3133956.3133984
DOI10.1145/3133956.3133984
Citation Keywahby_full_2017