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Simplified Submission of Inputs to Protocols
KTH, School of Computer Science and Communication (CSC), Theoretical Computer Science, TCS.ORCID iD: 0000-0003-4157-1371
2008 (English)In: Security And Cryptography For Networks, Proceedings / [ed] Ostrovsky, R; DePrisco, R; Visconti, I, 2008, Vol. 5229, 293-308 p.Conference paper (Refereed)
Abstract [en]

Consider an electronic election scheme implemented using a mix-net; a large number of voters submit their votes and then a smaller number of servers compute the result. The mix-net accepts an encrypted vote from each voter and outputs the set of votes in sorted order without revealing the permutation used. To ensure a fair election, the votes of corrupt voters should be independent of the votes of honest voters, i.e., some type of non-malleability or plaintext awareness is needed. However, for efficiency reasons the servers typically expect inputs from some homomorphic cryptosystem, which is inherently malleable. In this paper we consider the problem of how non-malleability can be guaranteed in the submission phase and still allow the servers to start their computation with ciphertexts of the homomorphic cryptosystem. This can clearly be achieved using general techniques, but we would like a solution which is: (i) provably secure under standard assumptions, (ii) non-interactive for submittors (iii) very efficient for all parties in terms of computation and communication. We give the first solution to this problem which has all these properties. Our solution is surprisingly simple and can be based on various Cramer-Shoup cryptosystems. To capture its security properties we introduce a variation of CCA2-security.

Place, publisher, year, edition, pages
2008. Vol. 5229, 293-308 p.
, Lecture Notes in Computer Science, ISSN 0302-9743 ; 5229
National Category
Computer Science
URN: urn:nbn:se:kth:diva-38410DOI: 10.1007/978-3-540-85855-3_20ISI: 000260042700020ScopusID: 2-s2.0-52149104963ISBN: 978-3-540-85854-6OAI: diva2:437926
6th International Conference on Security and Cryptography for Networks, SCN 2008; Amalfi; 10 September 2008 through 12 September 2008
Available from: 2011-08-31 Created: 2011-08-25 Last updated: 2012-01-20Bibliographically approved

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