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Computer Security — ESORICS 2002: 7th European Symposium on by Michael Backes, Birgit Pfitzmann (auth.), Dieter Gollmann,

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By Michael Backes, Birgit Pfitzmann (auth.), Dieter Gollmann, Günther Karjoth, Michael Waidner (eds.)

ESORICS, the ecu Symposium on examine in desktop defense, is the major research-oriented convention at the concept and perform of laptop safety in Europe. It happens each years, at a variety of destinations all through Europe, and is coordinated by means of an self sufficient guidance Committee. ESORICS 2002 was once together equipped through the Swiss Federal Institute of Te- nology (ETH) and the IBM Zurich examine Laboratory, and came about in Zurich, Switzerland, October 14-16, 2002. this system committee acquired eighty three submissions, originating from 22 co- attempts. For lovers of records: fifty five submissions got here from nations in Europe, the center East, or Africa, sixteen got here from Asia, and 12from North the US. The best nations have been united states (11 submissions), Germany (9), France (7), Italy (7), Japan (6), and united kingdom (6). each one submission was once reviewed via no less than 3 p- gram committee contributors or different specialists. every one submission coauthored via a software committee member got extra studies. this system c- mittee chair and cochair weren't allowed to post papers. The ?nal choice of papers used to be made at a software committee assembly and ended in sixteen permitted papers. compared, ESORICS 2000 obtained seventy five submissions and authorised 19 of them. this system re?ects the whole diversity of safety examine: we permitted papers on entry regulate, authentication, cryptography, database safeguard, formal equipment, intrusion detection, cellular code safeguard, privateness, safe undefined, and safe protocols. We gratefully recognize all authors who submitted papers for his or her e?orts in keeping the criteria of this conference.

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Extra resources for Computer Security — ESORICS 2002: 7th European Symposium on Research in Computer Security Zurich, Switzerland, October 14–16, 2002 Proceedings

Example text

3. n players next jointly find the row i such that the plaintext of e1 is equal to that of ai and the plaintext of e2 is equal to that of bi by using the plaintext equality test protocol. 4. For this i, it holds that ci ∈ E(x1 ∧ x2 ). 1 Bit-Slice Circuit and Mix-Match Protocol Overview We can obtain a highest-price auction protocol by combining the proposed circuit of Sec. 1 with any general multiparty protocol. Then a more efficient protocol is obtained because the bit-slice circuit is more efficient than the normal circuit as shown in Table 1.

We assume that both connectives have their classical semantics . Our definition trivially implies that for all instances db and for all queries Φ we have db model of eval ∗ (Φ)(db). We also define the semantic relationship |= for logical implication in a standard way: Φ |= Ψ iff for every structure db such that db model of Φ we also have db model of Ψ . The complementary relationship is denoted with |=. 2 Controlled Query Evaluation Controlled query evaluation consists of two steps. First, the correct answer is judged by some censor and then, depending on the output of the censor, some modificator is applied.

First we draw a Boolean circuit Cf which computes f . We 26 Kaoru Kurosawa and Wakaha Ogata next apply a general gate evaluation technique to each gate of Cf . Therefore, the smaller the circuit size is, the more efficient the protocol is. The normal approach for circuit design for auctions is to compare the bidding prices one by one (in other words, to run a millionaire’s problem protocol in order). To the authors’ knowledge, the smallest size circuit in this approach for the highest-price auction requires 7mk logical gates and m Selectk gates, where a logical gate has 2 input and 1 output bits, and a Selectk gate has 2k + 1 input and k output bits.

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