On macOS, these certificates are also used by Mail and Messages to confirm identities. You can examine the certificates themselves by clicking the lock icon next to a URL: These certificates are also used to encrypt your web traffic with HTTPS. When using Safari, for example, these certificates confirm that the URL you’re looking at is actually from the domain you request. So what is a certificate? It’s a digital signature that browsers user to verify website identities and protect against imposters. RELATED: What Is HTTPS, and Why Should I Care? Trustd provides services for evaluating trust in certificates for all processes on the system. ![]() To be specific, trustd manages and checks certificates. It is a daemon, which means it’s a process that runs in the background performing critical system tasks. ![]() Today’s process, trustd, is a part of macOS itself, and has been since 10.12 Sierra.
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