What is Workers Native ML-KEM and ML-DSA WebCrypto?

Much of today's online security relies on public-key cryptography, which lets two parties agree on a secret key over an open channel. A powerful enough quantum computer could solve the maths behind many current methods, so the field of post-quantum cryptography designs replacements believed to resist such attacks; experimenting with these in a JavaScript environment has been hard without built-in support. This technology adds two such algorithms to the Web Crypto programming interface of Cloudflare Workers, a serverless platform for running apps: ML-KEM, which establishes shared secrets, and ML-DSA, which signs and verifies data. Cloudflare describes it as an opt-in way to experiment without bundling a separate cryptographic implementation. NIST published the ML-KEM standard, FIPS 203, on August 13, 2024.

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