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Securizing data linkage in french public statistics.

Maxence Guesdon1,2, Eric Benzenine1, Kamel Gadouche3

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This study proposes a secure method for linking anonymized French administrative and medical data using cryptographic hashing. This approach enhances statistical research capabilities while maintaining high levels of data privacy and anonymity.

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Area of Science:

  • Health Informatics
  • Data Security
  • Public Health Research

Background:

  • French administrative records, including medical and social data, hold significant potential for statistical studies.
  • Current legislation restricts the use of non-anonymized medical data, hindering multi-source data linkage for research.
  • The national identifier (NIR) offers theoretical scope for data matching but faces legal and privacy constraints.

Purpose of the Study:

  • To develop a secure data linkage methodology for anonymized French administrative and medical records.
  • To overcome existing legal and technical barriers in conducting multi-source statistical studies.
  • To enhance the feasibility, regularity, and precision of research using sensitive data.

Main Methods:

  • Utilizing cryptographic hashing and secure data workflow techniques.
  • Implementing strong compartmentalization of identifying and non-identifying data.
  • Employing distinct hashing keys for each data linkage to control information access.

Main Results:

  • The proposed method enables secure linkage of anonymized files, overcoming current procedural constraints.
  • It provides robust control over data access, preventing unauthorized linkage and data accumulation that could compromise anonymity.
  • Facilitates easier, more regular, and precise statistical studies while preserving a high level of anonymity.

Conclusions:

  • The proposed cryptographic approach offers a viable solution for secure data linkage in French medico-social administrations.
  • It effectively balances the need for comprehensive statistical research with stringent data privacy requirements.
  • The primary challenge lies in organizational implementation, specifically the establishment of a Key-Management Authority.