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A Policy-Based Security Mechanism for Distributed Health Networks

A Policy-Based Security Mechanism for Distributed Health Networks. A. Onabajo, C. Obry and J. H. Jahnke netlab Research Group 1 Dept of Computer Science University of Victoria, Victoria, BC, Canada. Outline. Motivation Background Policy-Based Security Mechanism A Scenario Future work.

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A Policy-Based Security Mechanism for Distributed Health Networks

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  1. A Policy-Based Security Mechanism for Distributed Health Networks A. Onabajo, C. Obry and J. H. Jahnke netlab Research Group1 Dept of Computer Science University of Victoria, Victoria, BC, Canada

  2. Outline • Motivation • Background • Policy-Based Security Mechanism • A Scenario • Future work

  3. Motivation • Knowledge valuable asset of organizations • Trend towards Distributed/Integrated Health Information • Sensitive patient information has to be protected • Facilitate secured information exchange • Flexible and adaptable approach • Regulations and individual consents • Patient care should still be paramount

  4. Background • Research into middleware solution for integrated medical information systems • Based on domain and technological standards • HL7 Standards e.g. RIM and CDA • Policy-Based Systems • Offer adaptability and easier system modification • Encryption • Public Key Infrastructure (PKI)

  5. Policy-Based Security Mechanism • Policies • Provide the rules for information handling and exchange • Types • Patient • Organizational • Document Type • Encoding • eXtensible Access Control Markup Language (XACML)2 • OASIS standard • Provides languages for defining policies and requests

  6. Policy-Based Mechanism (cont’d) • Policy Evaluation Approach • Match policies to document • Evaluate the rule(s) of policies • Apply effects (deny or permit) of rules • Rule combination • Conflict resolution • Precedence by specificity3

  7. Policy-Based Mechanism (cont’d) • Encryption • Applied after policy evaluation and before transmission • Non-authorized sections are not transmitted • Document will be encrypted with a symmetric key • Encrypted document and symmetric key will be encrypted with recipients public key

  8. A Scenario

  9. Future Work • Currently at initial stage of development • Integration of a Role-based access mechanism • Further refinement of conflict resolution of policies

  10. Resources • www.netlab.uvic.ca • OASIS eXtensible Access Control Markup Language. Available online at http://www.oasisopen.org/committees/tc_home.php?wg_abbrev=xacml • Lupu E.C.and Sloman M., Conflicts in Policy-Based Distributed Systems Management IEEE Transactions on Software Engineering, 1999;25(6) 852-869. • C. Obry, J.H. Jahnke, A. Onabajo and W Schafer “Enabling Privacy in Cross-Organisational Information Mediation – An Application in Health Care”. Proceedings 2003 Software Technology and Engineering Practice, Workshop on e-health, software, systems and networks. Amsterdam, The Netherlands. Sept. 19-21, 2003

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