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Capabilities are a more scalable and adaptive access control approach  compared with the conventional approaches such as ACLs, due to their being  held and managed by users or agents in systems, but not the middleware. This  feature makes capabilities more suitable in distributed environments that  have dynamic populations. Treaties have been proposed to enhance the  capability approach by introducing sequences of actions, such that treaties  can capture characteristics of behaviours, and provide finer control over  accesses. However there is a new problem brought by the behaviour modeling of  treaties which is called duplication problem, which concerns preventing users  from gaining unauthorized behaviour by duplicating treaties. In this paper we  provide the formal definitions of treaty operations, and discuss the causes  of the duplication problem, and how treaty operations can affect this. We  also propose three models of treaty systems that aim to solve the duplication  problem, and evaluating their performance and scalability.

Duplication problem in treaty systems: Causes and solutions