Concurrency control in groupware systems
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
Access control for collaborative environments
CSCW '92 Proceedings of the 1992 ACM conference on Computer-supported cooperative work
Role-Based Access Control Models
Computer
An integrating, transformation-oriented approach to concurrency control and undo in group editors
CSCW '96 Proceedings of the 1996 ACM conference on Computer supported cooperative work
A decentralized temporal authorization model
Information systems security
Requirements of role-based access control for collaborative systems
RBAC '95 Proceedings of the first ACM Workshop on Role-based access control
ACM Transactions on Computer-Human Interaction (TOCHI)
Operational transformation in real-time group editors: issues, algorithms, and achievements
CSCW '98 Proceedings of the 1998 ACM conference on Computer supported cooperative work
An access control framework for multi-user collaborative environments
GROUP '99 Proceedings of the international ACM SIGGROUP conference on Supporting group work
Optimistic security: a new access control paradigm
Proceedings of the 1999 workshop on New security paradigms
Proof of correctness of Ressel's adOPTed algorithm
Information Processing Letters
Access control in collaborative systems
ACM Computing Surveys (CSUR)
Transparent adaptation of single-user applications for multi-user real-time collaboration
ACM Transactions on Computer-Human Interaction (TOCHI)
A lattice-based approach for updating access control policies in real-time
Information Systems
An Operational Transformation Algorithm and Performance Evaluation
Computer Supported Cooperative Work
Coordination Model for Real-Time Collaborative Editors
COORDINATION '09 Proceedings of the 11th International Conference on Coordination Models and Languages
Optimistic access control for distributed collaborative editors
Proceedings of the 2011 ACM Symposium on Applied Computing
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Distributed Collaborative Editors (DCE) provide computer support for modifying simultaneously shared documents, such as articles, wiki pages and programming source code, by dispersed users. Controlling access in such systems is still a challenging problem, as they need dynamic access changes and low latency access to shared documents. In this paper, we propose a flexible access control model where the shared document and its authorization policy are replicated at the local memory of each user. To deal with latency and dynamic access changes, we use an optimistic access control technique in such a way that enforcement of authorizations is retroactive. We show that naive coordination between updates of both copies can create security holes on the shared document, by permitting illegal modifications or rejecting legal modifications. Finally, we present a prototype for managing authorizations in collaborative editing work which may be deployed easily on P2P networks.