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[Encryption technique for linkable anonymizing].

Etsuji Okamoto1

  • 1National Institute of Public Health.

[Nihon Koshu Eisei Zasshi] Japanese Journal of Public Health
|August 7, 2004
PubMed
Summary

This study introduces a privacy-preserving method for linking health records using encryption. This technique encrypts personal names, allowing record linkage for research without compromising individual privacy.

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Area of Science:

  • Health Informatics
  • Cryptography
  • Public Health Research

Context:

  • Linking health insurance claims and medical records is crucial for cohort studies and cancer registration.
  • This process typically requires matching personally identifiable information, raising privacy concerns.

Purpose:

  • To explore a privacy-preserving method for record linkage using encryption.
  • To enable "linkable anonymizing" procedures for sensitive data.

Summary:

  • The study proposes a unidirectional encryption technique, applied using Microsoft Excel, to anonymize Japanese names by converting them into unique, undecipherable strings.
  • This method allows data holders to release personal data securely, facilitating record linkage for research without the need for key sharing.
  • The technique encrypts names into gibberish strings, ensuring privacy even if data is accidentally leaked, while maintaining the ability to link records.

Impact:

  • Enhances public health research by facilitating secure data linkage, potentially satisfying privacy regulations like the Privacy Protection Act.
  • Offers a novel approach to disease registry, although current limitations like complexity and code-breaking risks need further resolution for widespread adoption.

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