Patent ID: 11856099

Abstract:
The invention is a cryptographic pseudonym mapping method for an anonymous data sharing system, the method being adapted for generating a pseudonymised database (DB) from data relating to entities and originating from data sources (DSi), wherein the data are identified at the data sources (DSi) by entity identifiers (D) of the respective entities, and wherein the data are identified in the pseudonymised database (DB) by pseudonyms (P) assigned to the respective entity identifiers (D) applying a one-to-one mapping, irrespective of the originating data source. According to the invention, more than one mapper (Mj) is applied, and a respective pseudonym (P) is generated by sequentially performing, in a permutation of the mappers (Mj), a number k of mappings utilizing the mapping cryptographic keys (hij) of the mappers (Mj) belonging to the particular data source (DSi) on each encrypted entity identifier (Ci0) encrypted by the data source (DSi).