Can blockchain records stay secure in a post-quantum era?

Blockchain records face significant quantum security threats primarily because Shor's algorithm can break elliptic curve digital signature algorithms like ECDSA used to authorize transactions^[1]. However, hashing functions and symmetric encryption are expected to remain secure^[2].

To achieve quantum resistance, proposed upgrades involve migrating to post-quantum cryptography standards^[3], such as lattice-based cryptography, hash-based signatures, and quantum-resistant zero-knowledge systems^[4][5]. Lattice-based blind signatures built on the module learning with errors problem can ensure secure and anonymous data transmission^[6].

Despite these options, upgrading brings notable hurdles. Candidate post-quantum algorithms carry significant performance and size penalties compared to current methods; for instance, replacing ECDSA with CRYSTALS-Dilithium would dramatically increase transaction sizes, potentially reducing throughput by 80 to 90 percent without structural adjustments^[7]. Additional challenges include managing state requirements for certain algorithms like XMSS in transaction signatures^[8], navigating address migrations for exposed public keys^[9], and achieving consensus across decentralized blockchain governance models for necessary protocol upgrades^[10].

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