Post-quantum cryptography (PQC) is a new generation of classical cryptographic algorithms designed to remain secure even if large quantum computers become capable of attacking today’s public-key systems.

The issue is mainly public-key cryptography. RSA and elliptic-curve systems protect key exchange and digital signatures across the modern web, including the TLS connections behind HTTPS. A sufficiently capable quantum computer could use algorithms such as Shor’s to make those mathematical problems much easier to solve.

NIST finalized its first three PQC standards in 2024: ML-KEM for key establishment, plus ML-DSA and SLH-DSA for digital signatures. These use mathematical problems believed to be difficult for both classical and quantum computers.

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The urgency comes partly from “harvest now, decrypt later”: encrypted traffic can be recorded today and potentially decrypted years later. That is why browsers, servers and certificate systems are beginning to add PQC before a cryptographically relevant quantum computer exists. BitcoinVersus.Tech previously covered Cloudflare’s post-quantum certificate work and how a normal browser request depends on multiple security layers.

PQC does not require a quantum computer. It runs on conventional hardware. The challenge is migration: larger keys, new implementations, compatibility testing and replacing old cryptography across enormous software and hardware inventories.

Cloudflare says it now targets 2029 for full post-quantum security, including authentication. The broader lesson is simple: PQC is less about waiting for quantum computers and more about replacing vulnerable cryptography before they become practical.

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