Interactive publication
Back to the cataloguePrivacyCase 12 of 12
Temporal leakage
Publishing a sequence of snapshots over time for the same fine-grained cell (even if each snapshot independently meets k-anonymity) can let an observer intersect the snapshots to re-identify an individual whose presence changed between them.
Class
Case to account for
Affects
2 conversions
01
Detection
Compare successive published snapshots for the same cell; check whether the intersection of 'present in snapshot A and B' sets drops below the k-anonymity threshold.
02
Mitigation
01
Apply k-anonymity to the full published time series, not each snapshot independently
02
Add temporal noise or coarsen the time grain when publishing repeated cuts of the same fine cell
03
Affected conversions
PointH3
OPENRasterH3
OPENMore in Privacy
Consent-based precision reductionDeclared unit below the precise-location thresholdDevice trajectory exposureDifferential privacy noise calibrationHousehold-level targeting riskK-anonymity thresholdsMinimum aggregation windowRegional privacy restrictionsResolution degradation policySmall-cell re-identification riskSparse-audience suppression