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Cryptology ePrint Archive

Fast Isogeny Evaluation on Binary Curves Quick Draw Queries: Lightweight Searchable Public-key Ciphertexts with Hidden Structures via Non-Interactive Key Exchange A Constructive Treatment of Authentication Boolean Arithmetic over $\mathbb{F}_2$ from Group Commutators HAWK with Hint: Algebraic Key Recovery from Side-Channel Leakage Post-Quantum Secure k-Times Traceable Ring Signature A Key Schedule Design and Evaluation under Boundary Round-Key Leakage 2G2T: Constant-Size, Statistically Sound MSM Outsourcing Proximity Signatures Breaking Optimized HQC: The First Cache-Timing Full Decryption Oracle Key-Recovery Attack in Post-Quantum Cryptography Efficient Partially Blind Signatures from Isogenies Evaluating PQC KEMs, Combiners, and Cascade Encryption via Adaptive IND-CPA Testing Using Deep Learning High-Throughput Side-Channel-Protected Stream Cipher Hardware for 6G Systems Efficient e = 3 Threshold RSA via Integer Coordinates for Intel SGX Zeal: PIR for Non-Cooperative Databases VEIL: Lightweight Zero-Knowledge for Hash-Based Multilinear Proof Systems Witness-Indistinguishable Arguments of Knowledge and One-Way Functions The many faces of Schnorr: a touch-up Open Problems in List Decoding and Correlated Agreement Compressed Key Exchange Protocol from Orientations of Large Discriminant Using AVX-512 SPLASH: SPeculative Leakage-Adaptive Secure Hardware An Efficient Identity-Based Blind Signature Scheme from SM9 Efficient Batch Threshold Encryption Using Partial Fraction Techniques A note on the Unsuitability of LIGA for Linkable Ring Signatures: The perils of non-commutativity Verification Facade: Masquerading Insecure Cryptographic Implementations as Verified Code Cryptographic Implications of Worst-Case Hardness of Time-Bounded Kolmogorov Complexity Efficient Merkle-Tree Consistent Accumulator FLOSS: Fast Linear Online Secret-Shared Shuffling Which Privacy Blanket is Optimal in the Shuffle Model? Applications of Bruhat-Chevalley-Renner Decomposition to Metric-Aware Code-Based Cryptography
Pseudonymization and reporters’ protection by design in t...
Mirosław Kutyłowski, NASK National Research Institute · 2026-05-12 · via Cryptology ePrint Archive

Paper 2026/937

Pseudonymization and reporters’ protection by design in the EU whistleblower directive

Gabriel Wechta, NASK National Research Institute

Abstract

The EU Whistleblower Directive aims to create a framework where the persons reporting breaches of EU law are protected against retaliation. In contrast to GDPR, it is mainly based on trust assumptions and not on the concept of privacy and security by design. As we are explicitly dealing with problems of unlawful behavior, this is a critical issue. In this paper, we analyze the role of pseudonymization, the main technical tool promoted in the GDPR, within the Whistleblower Directive. To see the real impact of the Directive, we analyze how these issues are reflected in the national law in Germany and Poland. We show that the current law does not take advantage of the opportunities given by pseudonymization and does not create a clear legal framework that can be converted to problem-relevant technical requirements. Even worse, it allows the Member States to ban anonymous reports. On the other hand, we show that so far, no pseudonymization tool developed within official ID management frameworks addresses all threats to reporting systems.

BibTeX

@misc{cryptoeprint:2026/937,
      author = {Mirosław Kutyłowski and Gabriel Wechta},
      title = {Pseudonymization and reporters’ protection by design in the {EU} whistleblower directive},
      howpublished = {Cryptology {ePrint} Archive, Paper 2026/937},
      year = {2026},
      doi = {https://doi.org/10.1093/cybsec/tyaf028},
      url = {https://eprint.iacr.org/2026/937}
}