In this paper, we develop a secure multi-attribute procurement auction, in which a sales item is defined by several attributes called qualities, the buyer is the auctioneer (e.g., a government), and the sellers are the bidders. We first present a Vickrey-type protocol that can be used for multi-attribute procurement auctions. Next, we show how this protocol can be executed securely. key words :...

Business processes have gained a lot of attention because of the pressing need for integrating existing resources and services to better fulfill customer needs. A key feature of business processes is that they are built from composable services, referred to as component services, that may belong to different domains. In such a context, flexible multidomain identity management solutions are cruc...

In an identity based encryption scheme, each user is identified by a unique identity string. An attribute based encryption scheme (ABE), in contrast, is a scheme in which each user is identified by a set of attributes, and some function of those attributes is used to determine decryption ability for each ciphertext. Sahai and Waters introduced a single authority attribute encryption scheme and ...

Introduction Many preference models are quantitative. These kinds of models are based on utilities; a utility function determines for each outcome a numerical value of desirability. However, it is difficult to elicit such models from users. Humans generally express their preferences in a more qualitative way. Therefore, qualitative preference models would provide a better correspondence with hu...