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How to shuffle in public
MIT, Comp Sci & Artificial Intelligence Lab, Cambridge, MA 02139 USA.
ETH Zürich, Department of Computer Science.ORCID-id: 0000-0003-4157-1371
2007 (Engelska)Ingår i: THEORY OF CRYPTOGRAPHY, PROCEEDINGS, 2007, s. 555-574Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

We show how to obfuscate a secret shuffle of ciphertexts: shuffling becomes a public operation. Given a trusted party that samples and obfuscates a shuffle before any ciphertexts are received, this reduces the problem of constructing a mix-net to verifiable joint decryption. We construct public-key obfuscations of a decryption shuffle based on the Boneh-Coh-Nissim (BGN) cryptosystem and a re-encryption shuffle based on the Paillier cryptosystem. Both allow efficient distributed verifiable decryption. Finally, we give a distributed protocol for sampling and obfuscating each of the above shuffles and show how it can be used in a trivial way to construct a universally composable mix-net. Our constructions are practical when the number of senders N is small, yet large enough to handle a number of practical cases, e.g. N = 350 in the BGN case and N = 2000 in the Paillier case.

Ort, förlag, år, upplaga, sidor
2007. s. 555-574
Serie
Lecture Notes in Computer Science, ISSN 0302-9743
Nyckelord [en]
MIX-NET
Nationell ämneskategori
Data- och informationsvetenskap
Identifikatorer
URN: urn:nbn:se:kth:diva-50895ISI: 000245275900030ISBN: 978-3-540-70935-0 (tryckt)OAI: oai:DiVA.org:kth-50895DiVA, id: diva2:462999
Konferens
4th Theory of Cryptography Conference. Amsterdam, NETHERLANDS. FEB 21-24, 2007
Anmärkning
QC 20111208Tillgänglig från: 2011-12-08 Skapad: 2011-12-08 Senast uppdaterad: 2018-01-12Bibliografiskt granskad

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Wikström, Douglas

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Totalt: 151 träffar
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  • de-DE
  • en-GB
  • en-US
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  • sv-SE
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