Post-Quantum Cryptography Tools
Quantum-resistant encryption and certificate validation
3 tools available — free, instant, no login required
All Post-Quantum Cryptography Tools
Understanding Post-Quantum Cryptography
Post-Quantum Cryptography (PQC) addresses the existential threat that large-scale quantum computers pose to currently deployed public-key cryptographic systems. Shor's algorithm, when run on a sufficiently powerful quantum computer, can solve the integer factorization problem and the discrete logarithm problem in polynomial time, breaking RSA, DSA, DH, and ECDSA/ECDH — the algorithms protecting the majority of internet communications today. Grover's algorithm reduces the security of symmetric cryptography, effectively halving key lengths, meaning AES-256 retains adequate security in a post-quantum world while AES-128 may not.
The U.S. National Institute of Standards and Technology (NIST) completed its PQC standardization process in 2024 with three primary standards: ML-KEM (FIPS 203, formerly CRYSTALS-Kyber) for key encapsulation, ML-DSA (FIPS 204, formerly CRYSTALS-Dilithium) for digital signatures, and SLH-DSA (FIPS 205, formerly SPHINCS+) for hash-based signatures. These algorithms are based on mathematical hard problems that quantum computers cannot efficiently solve: Module Learning With Errors (MLWE) for Kyber and Dilithium, and hash function security for SPHINCS+. NIST also standardized FN-DSA (FIPS 206, Falcon) as an additional signature algorithm based on NTRU lattices. Additionally, BIKE and HQC (code-based KEM algorithms) are under evaluation for potential future standardization as alternative KEM options providing diversity if lattice-based assumptions are broken.
The migration to post-quantum cryptography requires a systematic "crypto-agility" approach: inventorying all cryptographic assets, prioritizing high-value long-term secrets, deploying hybrid classical/PQC schemes during transition, and establishing automated certificate management for rapid algorithm rotation. Organizations handling data with long classification lifetimes (government secrets, medical records, financial data) should begin migration immediately due to "harvest now, decrypt later" attacks, where adversaries collect encrypted data today to decrypt once quantum computers become available. The TLS 1.3 protocol already supports hybrid key exchange combining X25519 with ML-KEM-768, and Chrome, Firefox, and OpenSSL 3.2+ have deployed this capability.
Command-Line Usage
Test post-quantum cryptography operations from your terminal:
macOS / Linux: openssl version — check OpenSSL version (3.2+ supports ML-KEM hybrid) Linux: openssl list -kem-algorithms | grep -i kyber — check available KEM algorithms macOS / Linux: curl -v --curves X25519MLKEM768 https://example.com 2>&1 | grep "SSL" — test PQC TLS Linux: openssl genpkey -algorithm ml-dsa-65 -out ml-dsa-key.pem — generate ML-DSA keypair Windows PowerShell: Get-TlsCipherSuite | Where-Object { $_.Name -like "*KEM*" } — list PQC suites Linux: python3 -c "from cryptography.hazmat.primitives.asymmetric.x25519 import X25519PrivateKey; print('PQC-ready')"