Let's Encrypt Bets on Quantum-Safe Authentication

With major tech companies and governments setting firm 2030-2035 deadlines for post-quantum migration, Let's Encrypt's Merkle Tree Certificates proposal offers a practical approach to quantum-proof the Web PKI without compromising performance. The solution directly addresses the critical technical bottleneck—dramatically larger signature sizes in post-quantum algorithms—that has hindered adoption. This shift to implementation-ready solutions is urgent for protecting long-lived certificates like root CAs and code-signing keys, which are prime targets for quantum-capable adversaries.