Titlebook: E-Commerce and Web Technologies; 4th International Co Kurt Bauknecht,A Min Tjoa,Gerald Quirchmayr Conference proceedings 2003 Springer-Verl

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able of clearing combinatorial exchanges. The Vickrey-Groves-Clarke mechanism, which has been successfully applied in the case of one-sided combinatorial auctions, is not budget-balanced when generalized to two-sided auctions. We present a new model for an auction market with autonomous traders and

Chromatic

vices and matchmaking facilities and explains why directories such as UDDI are important but insufficient for web services and need to be complemented with advanced matchmaking facilities. It discusses the requirements that web services place on matchmaking, namely symmetry of information exchange,

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anonymity requirements of many donors, however, make the existing means of donation inappropriate for them. In this paper we investigate the business need for an internet charity donation scheme, identify the security requirements such a scheme should fulfill, and propose a scheme that uses an anony

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paper we propose ET-RBAC based Wireless Privilege Management Infrastructure(WPMI) model and Wireless Attribute Certificate(WAC) for authorization in mobile communication. All access control decisions are driven by an authorization policy, which is itself stored in an WAC. Authorization policies are

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and certificate revocation services, although very costly in practice, must be available to prevent big loss due to compromising of the signing key. In this paper, we employ a revocation-free public-key framework to improve the efficiency in maintaining the validity of digital signatures as non-rep

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