By Michael Backes, Birgit Pfitzmann (auth.), Dieter Gollmann, Günther Karjoth, Michael Waidner (eds.)
ESORICS, the ecu Symposium on learn in machine safeguard, is the prime research-oriented convention at the thought and perform of desktop safeguard in Europe. It occurs each years, at numerous destinations all through Europe, and is coordinated by means of an self sufficient guidance Committee. ESORICS 2002 was once together prepared by means of the Swiss Federal Institute of Te- nology (ETH) and the IBM Zurich learn Laboratory, and came about in Zurich, Switzerland, October 14-16, 2002. this system committee obtained eighty three submissions, originating from 22 co- attempts. For fanatics 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 USA. The best nations have been united states (11 submissions), Germany (9), France (7), Italy (7), Japan (6), and united kingdom (6). each one submission used to be reviewed by way of at the least 3 p- gram committee participants or different specialists. every one submission coauthored via a software committee member bought extra studies. this system c- mittee chair and cochair weren't allowed to put up papers. The ?nal collection of papers was once made at a software committee assembly and ended in sixteen authorised papers. compared, ESORICS 2000 got seventy five submissions and approved 19 of them. this system re?ects the entire diversity of defense study: we permitted papers on entry keep watch over, authentication, cryptography, database safety, formal tools, intrusion detection, cellular code protection, privateness, safe undefined, and safe protocols. We gratefully recognize all authors who submitted papers for his or her e?orts in holding the criteria of this conference.
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Additional resources for Computer Security — ESORICS 2002: 7th European Symposium on Research in Computer Security Zurich, Switzerland, October 14–16, 2002 Proceedings
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. In order to assist the censor, the system maintains a user log, denoted by log, which represents the explicit part of the user’s assumed knowledge.
Therefore, the views must in fact be identical in both cases so the probability of a correct guess b = b∗ is exactly 12 . Thus, we have Sys ∗ |=perf φSys ∗ . After proving the non-interference property for the ideal speciﬁcation, we now concentrate on the concrete implementation. Theorem 3. (Non-Interference Properties of Sys # ) The real system Sys # fulfills the non-interference property φSys # computationally, with ϕSys # given as in ✷ theorem 1. In formulas, Sys # |=poly φSys # . Proof. Putting it all together, we know that the original and also the modiﬁed real implementation of secure message transmission with ordered channels is computationally at least as secure as its (modiﬁed) speciﬁcation.
In Sec. 5, we show a new highestprice auction protocol which is obtained by combining the bit slice circuit and the mix and match technique. In Sec. 6, we present our second-price auction protocol. 2 Normal Approach for Auction Circuit Design 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). In this section, we present such a circuit which seems to be the most eﬃcient. 1 Primitive Gate For two bits x and y, deﬁne Bigger1 and EQ1 by Bigger1 (x, y) = 1 if x > y 0 otherwise EQ1 (x, y) = 1 if x = y 0 otherwise We next deﬁne a gate Selectκ which has 2κ + 1 input bits and κ output bits as follows.