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sourav avatar Crypto

Static vs Adaptive security of a distributed cryptographic protocol

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sourav

Let $n$ be the number parties in a distributed cryptographic protocol where an adversary can corrupt up to $n/3$ nodes in the network.

Static Adversary: The set of corrupt nodes is fixed a priori.
Adaptive Adversary: Adversary selects the set of corrupt nodes during execution of the protocol.

Let’s say we do not know how to prove a distributed cryptographic primitive X secure against an adaptive adversary. Then, if we use X inside another cryptographic primitive Y, is it possible to prove security of Y against an adaptive adversary?

My answer is yes as long as we use X in a way such that we can always produce a consistent view of X to an adaptive adversary.

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Maarten Bodewes avatar
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Maarten Bodewes
A protocol is generally thought of as public and descriptive, so having a "distributed protocol" doesn't make too much sense to me, but I suppose it is clear what is meant.
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