Database security, inference control (cont.)

Security in Computing (3rd Edition)

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1 November 4, 2005 © Doug Tygar, 2005 (cs161.org) Statistical Database Security (Part 2) Doug Tygar ([email protected]) November 4, 2005 cs161.org November 4, 2005 © Doug Tygar, 2005 (cs161.org) Census bureau problem Wants to publish average statistics But how do they change when a new person joins? November 4, 2005 © Doug Tygar, 2005 (cs161.org) Approaches that don’t work Adding noise Why not? Thresholding Why not? Revealing Medians Why not November 4, 2005 © Doug Tygar, 2005 (cs161.org) Example Grey 2 0 2000 C M Majors Grey 2 10 0 A F Liu West 1 0 0 C F Koch Holmes 2 10 5000 B F Hill West 3 0 4000 C M Groff West 0 15 1000 C F Fein Holmes 1 95 2000 C F Earhart Grey 3 35 1000 B M Dewitt West 0 20 3000 A F Chin Grey 0 0 0 B M Bailey Holmes 1 45 5000 C M Adams Dorm Drugs Fines Aid Race Sex Name List NAME where SEX=M DRUGS=1 List NAME where (SEX=M DRUGS=1) (SEX M SEX F) (DORM=AYRES) November 4, 2005 © Doug Tygar, 2005 (cs161.org) Census rules “n items over k percent” Withhold data if n items represent over k percent of data reported.
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