Unlinkability

Unlinkability is the property of two (or more) items in a system that ensures that these items are no more and no less related than they are related concerning the apriori knowledge of the adversary.

Definitions

According to the CyBOK (version 1),

Unlinkability. The property of two (or more) items in a system that ensures that these items are no more and no less related than they are related concerning the apriori knowledge of the adversary.