Role-based security for distributed object systems

This paper describes a security architecture designed to support role-based access control for distributed object systems in a large-scale, multi-organisational enterprise in which domains are used to group objects for specifying security policies. We use the concept of a role to define access control related to a position within an organisation although our role framework caters for the specification of both authorisation and obligation policies. Access control and authentication is implemented using security agents on a per host basis to achieve a high degree of transparency to the application level. Cascaded delegation of access rights is also supported. The domain based authentication service uses symmetric cryptography and is implemented by replicated servers which maintain minimal state

A Rewriting Based Model for Probabilistic Distributed Object Systems

Concurrent and distributed systems have traditionally been modelled using nondeterministic transitions over configurations. The nondeterminism provides an abstraction over scheduling, network delays, failures and randomization. However a probabilistic model can capture these sources of nondeterminism more precisely and enable statistical analysis, simulations and reasoning. We have developed a general semantic framework for probabilistic systems using probabilistic rewriting. Our framework also allows nondeterminism in the system. In this paper, we briefly describe the framework and its application to concurrent object based systems such as actors. We also identify a su#ciently expressive fragment of the general framework and describe its implementation. The concepts are illustrated by a simple client-server example

Evaluating FAIR Digital Object and Linked Data as distributed object systems

FAIR Digital Object (FDO) is an emerging concept that is highlighted by European Open Science Cloud (EOSC) as a potential candidate for building a ecosystem of machine-actionable research outputs. In this work we systematically evaluate FDO and its implementations as a global distributed object system, by using five different conceptual frameworks that cover interoperability, middleware, FAIR principles, EOSC requirements and FDO guidelines themself. We compare the FDO approach with established Linked Data practices and the existing Web architecture, and provide a brief history of the Semantic Web while discussing why these technologies may have been difficult to adopt for FDO purposes. We conclude with recommendations for both Linked Data and FDO communities to further their adaptation and alignment.Comment: 40 pages, submitted to PeerJ C

Clearninghouse--a payment framework for distributed object systems

Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.Includes bibliographical references (leaves 105-106).by Ellis Y. Chi.M.Eng