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oai:recercat.cat:2117/113832026-02-07T09:11:51Zcom_2072_1033col_2072_452950

On server trust in private proxy auctions Di Crescenzo, Giovanni Herranz Sotoca, Javier Sáez Moreno, Germán Universitat Politècnica de Catalunya. Departament de Matemàtica Aplicada IV Universitat Politècnica de Catalunya. MAK - Matemàtica Aplicada a la Criptografia Àrees temàtiques de la UPC::Informàtica::Seguretat informàtica::Criptografia Auctions -- Computer network resources Proxy auctions Subhastes electròniques Probes de coneixement zero Confiança en servidor Criptografia Seguretat de les comunicacions We investigate proxy auctions, an auction model which is proving very successful for on-line businesses (e.g.http://www.ebay.com), where a trusted server manages bids from clients by continuously updating the current price of the item and the currently winning bid as well as keeping private the winning client’s maximum bid. We propose techniques for reducing the trust in the server by defining and achieving a security property, called server integrity. Informally, this property protects clients from a novel and large class of attacks from a corrupted server by allowing them to verify the correctness of updates to the current price and the currently winning bid. Our new auction scheme achieves server integrity and satisfies two important properties that are not enjoyed by previous work in the literature: it has minimal interaction, and only requires a single trusted server. The main ingredients of our scheme are two minimal-round implementations of zero-knowledge proofs for proving lower bounds on encrypted values: one based on discrete logarithms that is more efficient but uses the random oracle assumption, and another based on quadratic residuosity that only uses standard intractability assumptions but is less efficient. Postprint (published version) 2010-10-09 Article Di Crescenzo, G.; Herranz, J.; Saez, G. On server trust in private proxy auctions. "Electronic commerce research", 09 Octubre 2010, vol. 10, núm. 3-4, p. 291-311. 1389-5753 https://hdl.handle.net/2117/11383 10.1007/s10660-010-9057-x eng http://www.springerlink.com/content/w86265685781xw37/about/ Restricted access - publisher's policy 21 p. application/pdf