Pseudonymization method and computer system for carrying out said method

JP2025507764A5Pending Publication Date: 2026-02-13ザ ヨーロピアン ユニオン レプリゼンテッド バイ ザ ヨーロピアン コミッション
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Patent Information

Application Number
JP2024550826
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-02-28
Filing Date
2023-02-28
Publication Date
2026-02-13

AI Technical Summary

Technical Problem

Existing pseudonymization methods fail to effectively manage pseudonymous data linkages across different data controllers, leading to increased risks of re-identification of data subjects, especially when central entities are involved.

Method used

A method of pseudonymization that uses cryptographic mixing functions and hash-based message authentication codes to generate and manage global and local pseudonyms, allowing different data controllers to use separate pseudonyms for the same data subject without relying on a central authority, thereby reducing the risk of re-identification.

Benefits of technology

This approach enables secure and decentralized pseudonymization, ensuring that different data controllers can share data while maintaining the privacy of the data subject, and reduces the risk of re-identification by keeping pseudonym seeds and keys secret across separate entities.

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Abstract

A pseudonymization method, the method including: a. receiving a data subject identifier from a first data controller (1), the first data controller having a first data controller identifier; b. calculating a pseudonym seed based on the data subject identifier using a cryptographic mixing function based on a pseudonym seed generation key (2); and calculating a global pseudonym as a first hash-based message authentication code on the pseudonym seed using a global pseudonym key (3).
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