Question

What is the mandatory outcome when a mutual authentication process between a cloud server and an IoT device fails the certificate revocation check?

Accepted Answer

When a certificate revocation check fails, the mandatory outcome is the immediate termination of the authentication process and the denial of access between the cloud server and the IoT device. A certificate revocation check is a security procedure where a system verifies that a digital certificate, which acts as an electronic identity card, has not been cancelled before its expiration date. Certificates are revoked if they are compromised, such as when a private key is stolen or a device is decommissioned. The check involves the server consulting a Certificate Revocation List, which is a published database of revoked certificates, or using the Online Certificate Status Protocol, a real-time service that reports the status of a specific certificate. If the check reveals that the certificate is on the revocation list, the server must conclude that the device is no longer trusted. Because the server cannot verify the identity of the device securely, it must refuse to establish a connection. This prevents unauthorized or compromised devices from accessing sensitive data or the cloud network.

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What is the mandatory outcome when a mutual authentication process between a cloud server and an IoT device fails the certificate revocation check?