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SSL Certificates · Article

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Security & SSL

ACME Renewal Information Simplifies Cert Renewal as Short-Lived Certs Go Mainstream

2026-08-05 Let's Encrypt Blog

Let's Encrypt and Shopify share how ACME Renewal Information (ARI) makes large-scale certificate renewal more reliable by replacing fixed thresholds with CA-suggested windows, complementing 45-day and shorter certificates.

Security & SSL

Let's Encrypt's Post-Quantum Future: Merkle Tree Certificates

2026-08-05 Let's Encrypt Blog

Let's Encrypt announces Merkle Tree Certificates (MTC) as its path to a post-quantum Web PKI, targeting a staging environment in late 2026 and production in 2027 while keeping handshakes fast.

SSL Certificates Let's Encrypt TLS Post-Quantum Certificate Transparency