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Fortified Multi-Party Computation: Taking Advantage of Simple Secure Hardware Modules

Broadnax, Brandon; Koch, Alexander; Mechler, Jeremias; Müller, Tobias; Müller-Quade, Jörn; Nagel, Matthias

Abstract (englisch):

In practice, there are numerous settings where mutually distrusting parties need to perform distributed computations on their private inputs.
For instance, participants in a first-price sealed-bid online auction do not want their bids to be disclosed.
This problem can be addressed using secure multi-party computation (MPC), where parties can evaluate a publicly known function on their private inputs by executing a specific protocol that only reveals the correct output, but nothing else about the private inputs.
Such distributed computations performed over the Internet are susceptible to remote hacks that may take place during the computation.
As a consequence, sensitive data such as private bids may leak.
All existing MPC protocols do not provide any protection against the consequences of such remote hacks.

We present the first MPC protocols that protect the remotely hacked parties’ inputs and outputs from leaking.
More specifically, unless the remote hack takes place before the party received its input or all parties are corrupted, a hacker is unable to learn the parties’ inputs and outputs, and is also unable to modify them.
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Verlagsausgabe §
DOI: 10.5445/IR/1000135827
Veröffentlicht am 26.07.2021
DOI: 10.2478/popets-2021-0072
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Kompetenzzentrum für angewandte Sicherheitstechnologie (KASTEL)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2021
Sprache Englisch
Identifikator ISSN: 2299-0984
KITopen-ID: 1000135827
HGF-Programm 46.23.01 (POF IV, LK 01) Methods for Engineering Secure Systems
Erschienen in Proceedings on privacy enhancing technologies
Verlag De Gruyter
Band 2021
Heft 4
Seiten 312–338
Projektinformation KASTEL_SKI (BMBF, EU 6. RP, 16KIS0843)
Vorab online veröffentlicht am 23.07.2021
Schlagwörter universal composability, remotely unhackable hardware modules, security notions, isolation
Nachgewiesen in Dimensions
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