Verifiable Homomorphic Oblivious Transfer and Private Equality Test

  • Helger Lipmaa
Conference paper

DOI: 10.1007/978-3-540-40061-5_27

Part of the Lecture Notes in Computer Science book series (LNCS, volume 2894)
Cite this paper as:
Lipmaa H. (2003) Verifiable Homomorphic Oblivious Transfer and Private Equality Test. In: Laih CS. (eds) Advances in Cryptology - ASIACRYPT 2003. ASIACRYPT 2003. Lecture Notes in Computer Science, vol 2894. Springer, Berlin, Heidelberg


We describe slightly modified version (that we call the HOT protocol) of the Aiello-Ishai-Reingold oblivious transfer protocol from Eurocrypt 2001. In particular, the HOT protocol will be what we call weakly secure when coupled with many different homomorphic semantically secure public-key cryptosystems. Based on the HOT protocol, we construct an efficient verifiable oblivious transfer protocol and an efficient verifiable private equality test. As a concrete application of our results, we propose a novel protocol called proxy verifiable private equality test, and apply it to a cryptographic auction scheme to improve its security.


cryptographic auctions homomorphic encryption verifiable oblivious transfer verifiable private equality test 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • Helger Lipmaa
    • 1
  1. 1.Laboratory for Theoretical CS, Department of CS&EHelsinki University of TechnologyEspooFinland

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