On October 8, 2025, the National Security Authority of the Slovak Republic (Národný Bezpečnostný Úrad, or NBÚ) published “Odporúčania pre kryptografické algoritmy — v1.0” (Recommendations for Cryptographic Algorithms, version 1.0). The document outlines a national framework for transitioning to post-quantum cryptography (PQC), recommending that Slovak institutions begin migrating away from classical asymmetric algorithms such as RSA, DSA, and ECDSA.
NBÚ’s guidance recommends that all symmetric encryption use 256-bit keys (in AES, Twofish, or ChaCha20) and that hash function outputs be at least 384 bits. For asymmetric cryptography, the document recommends adoption of NIST-standardized post-quantum algorithms: ML-KEM for key exchange, and ML-DSA or SLH-DSA for digital signatures. During the transition, hybrid schemes combining classical and post-quantum algorithms are recommended to ensure backward compatibility.
The recommendations reference the European Commission’s Recommendation 2024/1101 on the coordinated implementation roadmap for PQC transition. The document also calls for crypto-agility in software architecture, enabling organizations to swap cryptographic algorithms without major system redesigns.