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Chapter 8. Multilateral Security Information flowing across boundaries. Multilateral Models. Compartmentation Chinese wall BMA (British Medical Association) Develop system to track from conception to autopsy Policy consists of nine principles listed on pages 170-171

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chapter 8

Chapter 8

Multilateral Security

Information flowing across boundaries

multilateral models
Multilateral Models
  • Compartmentation
  • Chinese wall
  • BMA (British Medical Association)
    • Develop system to track from conception to autopsy
    • Policy consists of nine principles listed on pages 170-171
    • Pilot implementations of BMA are in service
inference control
Inference Control
  • If take name off of medical record is that enough?
  • Medicare keeps 3 sets of records
    • Complete records
    • Beneficiary encrypted
    • Public access
  • Inference control first looked at in census data
    • One record in 1000 made available
    • Noise added
    • Extreme values not included in averages
theory of inference control
Theory of inference control
  • Query set size control
  • Trackers
  • Cell suppression
    • Which sometimes requires complementary cell suppression
  • Limit number of attributes of query
  • Audit based controls
  • Randomization
de identification
De-identification
  • It is hard
  • Issues can be politically fraught
  • How to pick out specific data in a sea of information
residual problem
Residual problem
  • Insurers get all the data in order to pay claim
  • They want to know who the most expensive doctors and patients are
  • These are politically charged issue that seldom have rational solutions
medical records
Medical records
  • Easy problem setting up system of access controls to the record can only be viewed by sensible number of staff
  • Harder problem statistical security
  • Hardest problem managing interface between the 2
    • Specifically to medicine how to prevent spread of payment information
discussion articles
Discussion articles
  • Current state of BMA
  • Genetic database in Iceland
  • Inference cases
list of resources
List of Resources
  • Multilateral security
    • http://csrc.nist.gov/nissc/2000/proceedings/papers/202ra.pdf
  • Chinese Wall
    • http://www.gammassl.co.uk/topics/chinesewall.html
list of resources1
List of Resources
  • Inference control
    • http://www.parc.xerox.com/research/publications/details.php?id=5264
    • http://www.parc.xerox.com/research/publications/files/5264.pdf
    • http://www.informatik.uni-trier.de/~ley/db/conf/icsd/icsd2002.html
    • http://www.iis.sinica.edu.tw/~tshsu/projects/inf.html
list of resources2
List of resources
  • De-identification
    • http://www.mii.ucla.edu/dataserver-documentation-features-de-identification
    • http://www.haifa.ibm.com/projects/software/udip/index.html
    • http://www.sunclinical.com/old%20site_back%20up/about/privacy.htm