Mac computers can update certificates wirelessly or over Ethernet if any of the preinstalled root certificates become compromised. ![]() See the list of available trusted root certificates in macOS. ![]() A self-signed certificate can’t be verified in macOS without user interaction. If macOS can’t validate the trust chain of the signing CA, the service encounters an error. A certificate contains a public key, information about the client (or server), and is signed (verified) by a CA. ![]() ![]() These digital certificates can be used to securely identify a client or server, and to encrypt the communication between them using the public and private key pair. Apple devices include a number of preinstalled root certificates from various Certification Authorities (CAs), and iOS, iPadOS, and macOS validate the trust for these root certificates.
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