Generalization And Enforcement Of Role-based Access Control Using A Novel Event-based Approach

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Title: Generalization And Enforcement Of Role-based Access Control Using A Novel Event-based Approach
Author: Adaikkalavan, Raman
Abstract: Protecting information against unauthorized access is a key issue in information system security . Advanced access control models and mechanisms have now become necessary for applications and systems due to emerging acts , such as the Health Insurance Portability and Accountability Act (HIPAA ) and the Sarbanes -Oxley Act . Role -Based Access Control (RBAC ) is a viable alternative to traditional discretionary and mandatory access control . RBAC has been shown to be cost effective and is being employed in various application domains on account of its characteristics : rich specification , policy neutrality , separation of duty relations , principle of least privilege , and ease of management . Existing RBAC approaches support time - , content - and purpose -based , as well as context -aware and other forms of access control policies that are useful for developing secure systems . Although considerable amount of effort has been spent on policy specification aspects , relatively much less attention has been paid towards flexible enforcement of various aspects of RBAC approaches . Furthermore , current approaches are inadequate , as many applications and systems require the more dynamic and expressive event pattern constraints . In this thesis , we have focused on several aspects of RBAC , including generalization and enforcement of RBAC , by exploiting and extending a well -established event -based framework that has a solid theoretical foundation . Specifically , we have addressed the following problems and made the following contributions : Enforcement of existing RBAC Approaches : Security mechanisms are required for enforcing security policies . We have provided a flexible event -based technique for enforcing the RBAC standard and other current extensions in a uniform manner using an event framework . We have extended the event specification and detection with interval -based semantics for event operators and alternative actions for active rules . Generalization of RBAC and Snoop : We have generalized RBAC policies with expressive event pattern constraints . We have shown how to model diverse constraints , such as precedence , dependency , non -occurrence , and their combinations , using event patterns that are not available in existing RBAC approaches . Event patterns are event expressions that have simple and complex events as constituent events and they control the state change . Snoop , an event specification language , provides the basis for extensions needed to support the generalized RBAC . The generalization of RBAC using constraints based on event patterns can be accomplished by the extended Snoop . Enforcement of Generalized RBAC : We have shown the modeling and enforcement of generalized RBAC policies using the extended local event detector (LED ) . We have introduced event registrar graphs for capturing simple and complex event occurrences and keeping track of event patterns . We have also shown how RBAC with expressive event pattern constraints can be enforced using event registrar graphs . When compared to other mechanisms , the proposed event -based enforcement mechanism has the advantage of using the same framework for both policy specification and enforcement . We have briefly explored identification and handling of policy conflicts . Usability in RBAC : We have enhanced the usability of RBAC by adding an intelligent module for discovering roles and guiding (or prompting ) the user to acquire appropriate roles for performing operations on objects . This approach relieves the user from the details of role -permission assignment and allows concentrating on their task . We have developed several algorithms for discovering roles , and analyzed their complexity and effectiveness . Novel Applications : We have developed various applications for demonstrating the applicability of the results obtained in this thesis . i ) We have shown how role -based security policies can be supported in web gateways using a smart push -pull approach . ii ) We have shown how event operators based on interval -based semantics can be utilized for information filtering . iii ) We provided an integrated model for advanced data stream applications that supports not only stream processing but also complicated event and rule processing . We have also shown how the integrated model can be utilized for a network fault management system . This thesis is a first step in the direction of bridging the gap that currently exists between policy specification and enforcement . By mapping RBAC policies using a framework (event -based in our case ) that can be incorporated with the underlying system in various ways (integrated , layered , wrapper -based , and distributed ) , we have not only extended RBAC to make it more useful , but also shown how the extended specifications can be mapped and enforced . This combination of specification and enforcement using a common framework forms the core contribution of the thesis .
URI: http : / /hdl .handle .net /10106 /231
Date: 2007-08-23

Citation

Generalization And Enforcement Of Role-based Access Control Using A Novel Event-based Approach. Available electronically from http : / /hdl .handle .net /10106 /231 .

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