Data at rest within the data center is encrypted using AES-256 and is FIPS 140-2 compliant. All data centers are ISO 27001 certified, SOC 2 attested. </li> <li> Lastly, the zero-knowledge layer is secured using AES-GCM, using encryption keys never shared with Proctorio. </li> </ol> <p> Let’s breakdown that last and most important layer: <strong>zero-knowledge encryption</strong>. </p> Zero-Knowledge Encryption <p> Proctorio utilizes <strong>zero-knowledge encryption</strong>, which means we have zero access to the encrypted data on our own servers. This unique design allows nothing to leave your computer until after it is encrypted.