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On adaptive vs. non-adaptive security of multiparty protocols
Authors: Ran Canetti, Ivan Damgard, Stefan Dziembowski, Yuval Ishai, Tal MalkinAbstract:
Security analysis of multiparty cryptographic protocols distinguishes
between two types of adversarial settings: In the non-adaptive
setting, the set of corrupted parties is chosen in advance, before the
interaction begins. In the adaptive setting, the adversary chooses
who to corrupt during the course of the computation. We study the
relations between adaptive security (i.e., security in the adaptive
setting) and non-adaptive security, according to two definitions and
in several models of computation. While affirming some prevailing
beliefs, we also obtain some unexpected results. Some highlights of
our results are:
o According to the definition of Dodis-Micali-Rogaway (which is set in
the information-theoretic model), adaptive and non-adaptive security
are equivalent. This holds for both honest-but-curious and Byzantine
adversaries, and for any number of parties.
o According to the definition of Canetti, for honest-but-curious
adversaries, adaptive security is equivalent to non-adaptive
security when the number of parties is logarithmic, and is strictly
stronger than non-adaptive security when the number of parties is
super-logarithmic. For Byzantine adversaries, adaptive security is
strictly stronger than non-adaptive security, for any number of
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