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Paper 2006/017
Threshold and Proactive Pseudo-Random Permutations
Yevgeniy Dodis and Aleksandr Yampolskiy and Moti Yung
Abstract
We construct a reasonably efficient threshold and proactive pseudo-random permutation (PRP). Our protocol needs only O(1) communication rounds. It tolerates up to (n-1)/2 of n dishonest servers in the semi-honest environment. Many protocols that use PRPs (e.g., a CBC block cipher mode) can now be translated into the distributed setting. Our main technique for constructing invertible threshold PRPs is a distributed Luby-Rackoff construction where both the secret keys *and* the input are shared among the servers. We also present protocols for obliviously computing pseudo-random functions by Naor-Reingold and Dodis-Yampolskiy with shared input and keys.
Metadata
- Available format(s)
- PDF PS
- Publication info
- Published elsewhere. Extended abstract is to appear in TCC 2006.
- Keywords
- Distributed Block CiphersDistributed Luby-Rackoff ConstructionOblivious Pseudo-Random FunctionsThreshold Cryptography.
- Contact author(s)
- aleksandr yampolskiy @ yale edu
- History
- 2006-01-17: received
- Short URL
- https://ia.cr/2006/017
- License
-
CC BY