Google unveils Merkle Tree Certificates for Post‑Quantum TLS
🔐 Google is developing Merkle Tree Certificates (MTCs) in Chrome to make HTTPS certificates resilient to future quantum attacks while avoiding the bandwidth cost of adding post‑quantum algorithms to traditional X.509 chains. Working with Cloudflare and the PLANTS working group, Chrome proposes a model where a CA signs a single tree head and browsers receive lightweight proofs of inclusion. Google is running a feasibility study (Phase 1), plans to invite compatible Certificate Transparency logs in Q1 2027 (Phase 2), and aims to finalize requirements and launch a Chrome Quantum‑resistant Root Store (CQRS) and MTC-only root program by Q3 2027.
