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Distributed Blinding for ElGamal Re-encryption

Author
Zhou, Lidong; Marsh, Michael A.; Schneider, Fred B.; Redz, Anna
Abstract
A protocol is given that allows a set of n servers to cooperate and
produce an ElGamal ciphertext encrypted under one key from an ElGamal ciphertext encrypted under another, but without plaintext ever becoming available. The protocol is resilient to floor(n-1)/3 of the servers being compromised and requires no assumptions about execution speeds or message delivery delays. Two new building blocks employed---a distributed blinding protocol and verifiable dual encryption proofs---could have uses beyond re-encryption protocols.
Date Issued
2004-01-06Publisher
Cornell University
Subject
computer science; technical report
Previously Published As
http://techreports.library.cornell.edu:8081/Dienst/UI/1.0/Display/cul.cis/TR2004-1920
Type
technical report