Cloudflare to become a public certificate authority with post-quantum certificates

What happened

Cloudflare said a joint experiment with Google LLC’s Chrome team, announced last October , was successful. The format is aimed at a size problem in post-quantum […] The post Cloudflare to become a public certificate authority with post-quantum certificates appeared first on SiliconANGLE . Cloudflare is an information and communications technology company based in San Francisco.

UPDATED 09:00 EDT / SEPTEMBER 29 2026 SECURITY Cloudflare to become a public certificate authority with post-quantum certificates by Duncan Riley Cloudflare Inc. The format is aimed at a size problem in post-quantum certificates.

Output from one of the newly standardized post-quantum signature algorithms runs to 2,420 bytes, against 64 bytes for the elliptic curve schemes most sites use now. Cloudflare expects quantum computers capable of breaking today’s encryption within years.

Merkle Tree Certificates, which Cloudflare co-authored as an Internet Engineering Task Force draft specification, avoid sending large signatures with every connection. A lightweight proof that the certificate sits in a trusted public log does the verification work. Let’s Encrypt, the nonprofit issuer, said in June that it expects to issue the format in production in 2027.

Key facts

• Cloudflare said a joint experiment with Google LLC’s Chrome team, — announced: last October , was successful