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Knowledge Centre

Managing personal data (PDPA)

What anonymisation can we use?

  • A non-exhaustive list of commonly used techniques is set out below:

    a) Pseudonymisation: replacing personal identifiers (e.g., names) with other references (e.g., tags which are randomly generated)

    b) Aggregation: displaying values as totals, so that none of the individual values which could identify an individual is shown

    c) Replacement: replacing values or a subset of the values with a computed average or a number derived from the values

    d) Data suppression: removing values (e.g., ethnicity) that are not required for the purpose

    e) Data recoding or generalisation: banding or grouping of categories (e.g., Primary 3) into broader categories (e.g., primary)

    f) Data shuffling: mixing up or replacing values with those of the same type so that the information looks similar but is unrelated to the actual details

    g) Masking: removing certain details while preserving the look and feel of the data (e.g., replacing NRIC numbers with X)