Use these instructions to enable Apple Mail to use client certificates to digitally sign and encrypt e-mail. Now you can transfer your encrypted certificate file to another computer using a USB key, email, or other file sharing method.Give your exported item a strong pass-phrase.p12 and the file format must be 'Personal Information Exchange (.p12)'. Select a location for export, such as your Desktop.Right-click the certificate and select Export alternatively, from the File menu, select Export Items.You may have more than one personal certificate in your Keychain select the one issued by 'InCommon Standard Assurance Client CA' with the latest expiration date. Select the certificate associated with your name.The right pane will display a list of all your installed certificates.

In the 'Categories' section, select Certificates.

Select the key-chain where you installed your certificate this will usually be the login key-chain.

From the Applications folder, open the Utilities folder and then open Keychain Access.If you want your personal certificate on other computers or devices you will need to export it. Note: Your certificate is only available on the computer and user account where you install it. The certificate is now available for Apple Mail, Outlook, and other applications that can use client certificates. The certificate will be installed on your Mac and will appear in the ' My Certificates' section of Keychain Access. OS X Keychain Access will prompt you for the certificate passphrase enter the passphrase you created when you requested the certificate.Double-click the file downloaded from the InCommon Certificate Manager.The end-user will be asked for this PIN when he/she imports the certificate into the certificate store of their machine. The PIN specified in the PIN fields is used to protect access to this. The Incommon Certificate Manager will deliver the certificate to the end-user in PKCS#12 file format (.p12 file). You will need this pass-phrase to install the cert. pfx), using the PIN you created for it at the time of request. When you receive your certificate from InCommon, it will be encrypted in the PKCS 12 format (.p12 or.

You can use Client Certificates, also called 'S/MIME Certs' or 'Personal Certificates', with most e-mail clients to digitally sign or encrypt e-mail. Using S/MIME Client Certificates with Apple Mail and Outlook for OS X Installing the S/MIME Certificate on your Apple Mac

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