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If you receive an invitation from a certificate authority on Mac
If an administrator or other user wants to have secure contact with you, he or she may arrange for a certificate authority to invite you to request a certificate.
- Go to the Keychain Access app  on your Mac. on your Mac.- To open Keychain Access, search for it in Spotlight, then press Return. 
- Open the invitation. 
- Enter your email address and name, then click Continue. - To change the way the key pairs are generated, click “Let me specify key pair information.” 
- For an explanation about key size and encryption algorithms, click Learn More. 
 
- Click Done. 
- Send the completed invitation to the certificate authority. - If the authority agrees, it creates your certificate and returns it to you as an email attachment. 
See alsoWhat is Keychain Access on Mac?