Affordable security or big guy vs small guy: Does the depth of your pockets impact your protocols?

D. Friolo, F. Massacci, C.N. Ngo, D. Venturi

Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review

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When we design a security protocol we assume that the humans (or organizations) playing Alice and Bob do not make a difference. In particular, their financial capacity seems to be irrelevant.

In the latest trend to guarantee that secure multi-party computation protocols are fair and not vulnerable to malicious aborts, a slate of protocols has been proposed based on penalty mechanisms. We look at two well-known penalty mechanisms, and show that the so-called see-saw mechanism (Kumaresan et al., CCS 15), is only fit for people with deep pockets, well beyond the stake in the multi-party computation itself.

Depending on the scheme, fairness is not affordable by everyone which has several policy implications on protocol design. To explicitly capture the above issues, we introduce a new property called financial fairness.
Original languageEnglish
Title of host publicationSecurity Protocols XXVII
Subtitle of host publication27th International Workshop, Cambridge, UK, April 10–12, 2019, Revised Selected Papers
EditorsJonathan Anderson, Frank Stajano, Bruce Christianson, Vashek Matyáš
Number of pages13
ISBN (Electronic)9783030570439
ISBN (Print)9783030570422
Publication statusPublished - 2020

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume12287 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

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  • Governance for Society


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