Concurrency control based on role concept
International Journal of High Performance Computing and Networking
A purpose-based synchronisation protocol of multiple transactions in multi-agent systems
International Journal of Business Intelligence and Data Mining
Enhancing optimistic access controls with usage control
TrustBus'07 Proceedings of the 4th international conference on Trust, Privacy and Security in Digital Business
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This paper discusses a novel locking protocol to preventillegal information flow among objects in a role-based accesscontrol model. In this paper, we newly define a conflictingrelation "a role R1 conflicts with another role R2"to show that illegal information flow may occur if a transactionwith R1 is performed before another transaction withR2. Here, we newly introduce a role lock on an object toabort a transaction with R1 if another transaction with R2had been already performed on the object. Role locks arenot released even if transactions issuing the role locks commit.A role lock on an object can be released if informationbrought into the object got obsolete. We discuss how to releaseobsolete role locks.