Abstract / Description of output
Traditionally, cryptographers assume a worst-case adversary who can act arbitrarily. More recently, they have begun to consider rational adversaries who can be expected to act in a utility-maximizing way. Here we apply this model for the first time to the problem of Byzantine agreement (BA) and the closely related problem of broadcast, for natural classes of utilities. Surprisingly, we show that many known results (e.g., equivalence of these problems, or the impossibility of tolerating t∈≥∈n/2 corruptions) do not hold in the rational model. We study the feasibility of information-theoretic (both perfect and statistical) BA assuming complete or partial knowledge of the adversary's preferences. We show that perfectly secure BA is possible for t∈<∈n corruptions given complete knowledge of the adversary's preferences, and characterize when statistical security is possible with only partial knowledge. Our protocols have the added advantage of being more efficient than BA protocols secure in the traditional adversarial model.
Original language | English |
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Title of host publication | Automata, Languages, and Programming |
Subtitle of host publication | 39th International Colloquium, ICALP 2012, Proceedings |
Publisher | Springer |
Pages | 561-572 |
Number of pages | 12 |
Edition | PART 2 |
ISBN (Electronic) | 978-3-642-31585-5 |
ISBN (Print) | 978-3-642-31584-8 |
DOIs | |
Publication status | Published - 13 Jul 2012 |
Event | 39th International Colloquium on Automata, Languages, and Programming - Warwick, United Kingdom Duration: 9 Jul 2012 → 13 Jul 2012 https://warwick.ac.uk/fac/cross_fac/dimap/icalp2012/ |
Publication series
Name | Lecture Notes in Computer Science |
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Publisher | Springer, Berlin, Heidelberg |
Number | PART II |
Volume | 7392 |
ISSN (Print) | 0302-9743 |
ISSN (Electronic) | 1611-3349 |
Conference
Conference | 39th International Colloquium on Automata, Languages, and Programming |
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Abbreviated title | ICALP 2012 |
Country/Territory | United Kingdom |
City | Warwick |
Period | 9/07/12 → 13/07/12 |
Internet address |