C5 provides deterministic primality testing and signed certificates for security-critical applications — take the RSA, ECC, or Diffie-Hellman parameters you already hold and get back checkable, tamper-evident proof.
No probabilistic guessing. Deterministic results across the full integer range — every verdict is provable, not statistical.
Every verification produces an HMAC-SHA256 signed certificate. Auditable. Traceable. Tamper-evident. Attach to any key-generation workflow.
127-bit verification in under 600ms. 256-bit prime generation in under 2 seconds. Fast enough for real-time key generation.
Security assessments aligned with NIST SP 800-57. RSA, ECC, and DH key sizes evaluated against minimum security requirements. Compliance status on every certificate.
One module. Import and call. Integrates with any crypto pipeline — and you can drive it directly from the console below.
112-bit equivalent security. NIST compliant. ✓
140-bit equivalent security. NIST compliant. ✓
128-bit equivalent security. NIST compliant. ✓
192-bit equivalent security. NIST compliant. ✓
Drive C5 directly. Paste your key, then press SEND on an endpoint. Responses come back raw.