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Mosaic/jigsaw effect

The technical process of combining anonymised data with auxiliary data in order to attempt to reconstruct identifiers linking data to the individual it relates to.

Open Data White Paper
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Similar comment as on de-anonymisation

While the glossary may not be intended for casual users, the bald definition given here almost implies that this is something that is easy and can be expected to happen on a  regular basis.  Presumably the aim is to make this extremely difficult, except for those involved with producing the anonymised dataset in the first place.

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