Systems and methods for establishing a link between identifiers without disclosing specific identifying information

A first party system for establishing a link between user identifiers of different systems without disclosing specific user identifying information, the first party system comprising:

• a processing circuit operably coupled to a memory and configured to:
• retrieve, from a third party system, copies of one or more first data sets that were re-encrypted by the third party system and one or more second data sets that were encrypted by the third party system, the one or more first data sets each comprising a first match key and a first user identifier associated with the first party system and the one or more second data sets each comprising a second match key and a second user identifier associated with the third party system;
• generate one or more re-encrypted second data sets by encrypting the one or more encrypted second data sets;
• and
• assign, based on matching relationships between first and second match keys of the one or more re-encrypted first data sets and the one or more re-encrypted second data sets, bridge identifiers for first user identifiers associated with the first party system and second user identifiers associated with the third party system, the matching relationships indicating links between the first and second match keys and the bridge identifiers linking the first user identifiers and second user identifiers.

A method for establishing a link between user identifiers of different systems without disclosing specific user identifying information, the method comprising:

• retrieving, by a first party processing circuit and from a third party processing circuit, copies of one or more first data sets that were re-encrypted by the third party processing circuit and one or more second data sets that were encrypted by the third party processing circuit, the one or more first data sets each comprising a first match key and a first user identifier associated with the first party processing circuit and the one or more second data sets each comprising a second match key and a second user identifier associated with the third party processing circuit;
• generating, by the first party processing circuit, one or more re-encrypted second data sets by encrypting the one or more encrypted second data sets;
• assigning, by the first party processing circuit and based on matching relationships between first and second match keys of the one or more re-encrypted first data sets and the one or more re-encrypted second data sets, bridge identifiers for first user identifiers associated with the first party processing circuit and second user identifiers associated with the third party processing circuit, the matching relationships indicating links between the first and second match keys and the bridge identifiers linking the first user identifiers and second user identifiers;
• and
• pruning, by the first party processing circuit, the matching relationships by removing one or more of the links between the first and second match keys by determining first match keys associated with the first party processing circuit or second match keys associated with the third party processing circuit that have more than one link.