An Efficient Publicly Verifiable Mix-Net for Long Inputs

Jun FURUKAWA  Kazue SAKO  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E90-A   No.1   pp.113-127
Publication Date: 2007/01/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e90-a.1.113
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Protocols
Keyword: 
hybrid-mix,  public verifiability,  multiple encryption,  efficient,  

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Summary: 
We propose here the first efficient publicly verifiable hybrid mix-net. Previous publicly verifiable mix-net was only efficient for short ciphertexts and was not suitable for mixing long messages. Previous hybrid mix-net can mix long messages but did not have public verifiability. The proposed scheme is efficient enough to treat large scale electronic questionnaires of long messages as well as voting with write-ins, and offers public verifiability of the correctness of the tally. The scheme is provably secure if we assume random oracles, semantic security of a one-time symmetric-key cryptosystem, and intractability of decision Diffie-Hellman problem. This paper is the full version of the extended abstract appeared in FC 2006 [10].