Keychain Access: Determine if a certificate is valid
Use the Certificate Assistant in Keychain Access to evaluate a certificate by looking at its trust policies to determine if it is valid.
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Click Certificates in the Category list, then double-click the certificate you want to evaluate.
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Choose Keychain Access > Certificate Assistant > Evaluate [certificate name].
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Select a trust policy:
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To evaluate an email certificate, select S/MIME, then type the email address of the sender.
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To evaluate a web server, select SSL (Secure Sockets Layer), then enter the host server’s URL. To ask the host for the certificates, select Ask Host For Certificates.
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To evaluate other types of certificates, select “Generic.”
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To view the information about a certificate’s digital signature, select Code Signing.
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For an explanation about certificates and trust policies, click Learn More.
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Click Continue.