Computer Security – ESORICS 2003: 8th European Symposium on by Elisa Bertino, Elena Ferrari (auth.), Einar Snekkenes,

By Elisa Bertino, Elena Ferrari (auth.), Einar Snekkenes, Dieter Gollmann (eds.)

ESORICS, the eu Symposium On study In computing device safety, is the best research-oriented convention at the thought and perform of computing device - curity in Europe. the purpose of ESORICS is to additional the growth of study in machine defense through developing a eu discussion board for bringing jointly - searchersinthisarea,bypromotingtheexchangeofideaswithsystemdevelopers and by way of encouraging hyperlinks with researchers in similar components. ESORICS is coordinated by way of an self reliant guidance committee. long ago it happened each years at a variety of destinations all through Europe. beginning this yr, it is going to ensue every year. ESORICS 2003 used to be prepared by means of Gjøvik collage collage, and happened in Gjøvik, Norway, October 13–15, 2003. this system committee acquired 114 submissions, originating from 26 co- attempts on all continents. part the papers originated in Europe (57). the main dominant nations have been: united kingdom (16), united states (14), Germany (6), South Korea (6), Sweden (6), Italy (5), France (4) and Poland (4). every one submission was once reviewed via not less than 3 application committee individuals or different specialists. this system committee chair and co-chair weren't allowed to put up papers. The ?nal sel- tion of papers used to be made at a application committee assembly by means of per week of electronic mail discussions. Out of the 114 papers got, purely 19 bought authorized (17%). compared, ESORICS 2000and 2002received 75and 83papersand authorised 19% and 16%, respectively. this system re?ected the entire variety of safeguard study, together with entry keep watch over, cryptographic protocols, privateness bettering applied sciences, safety m- els, authentication, and intrusion detection.

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Example text

This approach has, indeed, been attempted by several researchers [9,5,12,6,20] concerned with the interoperability between agents subject to different policies. But such composition of policies has several serious drawbacks in the context of coalitions. First, composition of policies could be computationally hard. According to [12], in particular, such composition is intractable for more than two policies, even for a relatively simple policy language. This is particularly serious problem for a coalition, which would require a quadratic number (in terms of its membership size) of compositions of triples of policies—a truly daunting prospect.

It explicitly supports process definition versioning and workflow instances migration [15]. The idea behind process definition versioning is not to update process definitions in place, but version them. Those workflows that cannot be migrated can continue their execution under the old version. Within this approach, evolutionary changes are supported by creating a new process definition version and performing changing operations on this new version. Ad-hoc changes to specific process instance are supporting by creating a variant of the process definition and migrating the process instance to this variant.

If, for example, the instance of the activity evaluate loan had already been executed by an account manager, it would not be compliant with the new process definition and the migration could not be performed. 7 Conclusions and Future Work Recently, WfMSs have been extended in order to support both ad-hoc and evolutionary changes. These features raise new access control requirements that are not met by traditional workflow access control models. In this paper, we identify access control requirements of adaptive WfMSs and present an access control model that meets these requirements.

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