CECPQ1 is a Post-Quantum Key Exchange algorithm created for the Google Chrome web browser.

The New Hope (PDF) protocol is used in combination with ECDSA and Elliptic Curve 25519 to provide a novel test of Quantum Encryption. The aim is to test the capabilities of New Hope for robustness against quantum attacks, with a fallback to conventional Elliptic Curve cryptography if required.

When visiting a Google site Chrome users can open the Security Panel to see if CECPQ1_ECDSA is being used.