post-quantum-cryptography web-security tls digital-certificates

A Post-Quantum Future for Let's Encrypt

letsencrypt.org

June 3, 2026

6 min read

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Summary

Let’s Encrypt is developing Merkle Tree Certificates (MTCs) to ensure a post-quantum-safe Web PKI. MTCs aim to provide post-quantum authentication while maintaining the speed and reliability of TLS.

Key Takeaways

Let’s Encrypt is pursuing Merkle Tree Certificates (MTCs) to establish a post-quantum-safe Web PKI without compromising speed and reliability.
The NSA and NIST are transitioning to post-quantum algorithms by 2035, influencing the broader Web PKI ecosystem to adopt similar timelines.
Post-quantum authentication is becoming urgent due to the potential threat of cryptographically relevant quantum computers (CRQCs) that could forge signatures in real time.
MTCs allow for batch certificate issuance with a single signature, potentially reducing the size and improving the efficiency of TLS handshakes compared to traditional methods.

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Community Sentiment

Mixed

Positives

Post-quantum authentication is becoming an urgent issue that the Web PKI ecosystem must address, especially for long-lived keys that are high-value targets.
Merkle Tree Certificates represent a significant advancement by discarding outdated practices while maintaining essential security features, potentially improving performance.
The smaller authentication path in MTC handshakes, even with post-quantum algorithms, indicates a promising direction for more efficient security protocols.

Concerns

Concerns about the practicality of quantum-safe encryption persist, as the capabilities of quantum computing remain uncertain and theoretical.
The transition to new cryptographic methods like Merkle Tree Certificates could introduce significant challenges, including potential downsides related to state syncing and validation processes.
Skepticism exists regarding the revolutionary impact of quantum computing, with some viewing it as an expensive solution for niche problems rather than a transformative technology.