Post-quantum cryptography libraries you can use today

Why PQC belongs in this library

A strong educational hub should make it obvious that quantum-adjacent software is not all one thing. PQC projects live on the security side of the field, not the circuit-programming side, yet they are among the most practical and deployable resources linked to quantum risk.

That makes them educationally important. They help readers build a more accurate picture of what action in this field looks like right now.

Reference implementations versus integrations

Projects like liboqs and PQClean help people inspect implementations and algorithm support more directly. Integrations like the OpenSSL and OpenSSH ports help people see how these ideas move closer to real systems and familiar operational surfaces.

That distinction matters because it changes what the reader should expect from each project. Some are better for evaluation and research. Others are better for understanding how adoption could look in practice.

How to use the category well

If you are new, start with liboqs because it anchors the conversation. Then look at PQClean for additional implementation context and the OpenSSL or OpenSSH ports to understand integration pressure. That gives you a clean sequence from algorithms to systems.

The category is worth learning because it is one of the clearest examples of quantum-related software that matters today, not only in a future research setting.

Resources to open next

The goal of this guide is to help you navigate toward the right tools, not stop at the overview. The resources below are the strongest next clicks for this topic.

open-quantum-safe/Post-quantum cryptography

liboqs

C library for prototyping and experimenting with quantum-resistant cryptography

CMITFlagship

2,946 stars · Updated 3mo ago

open-quantum-safe/Post-quantum cryptography

openssh-portable

Fork of OpenSSH that includes prototype quantum-resistant key exchange and authentication in SSH based on liboqs.

CBSD-3-Clause

232 stars · Updated 5mo ago

open-quantum-safe/Post-quantum cryptography

openssl

[DEPRECATED — See notice in README.md and switch to OpenSSL 3 OQS Provider] Fork of OpenSSL 1.1.1 that includes prototype quantum-resistant algorithms and ciphersuites based on liboqs

CBSD-3-ClauseArchive

307 stars · Updated 8mo ago

PQClean/Post-quantum cryptography

PQClean

Clean, portable, tested implementations of post-quantum cryptography

C

923 stars · Updated 3mo ago

theQRL/Post-quantum cryptography

QRL

Quantum Resistant Ledger

PythonMIT

463 stars · Updated 6mo ago

Next step

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