Mac OS X 10.3: Types of Certificates Keychain Access Can Import

Keychain Access, located in the Utilities folder, works with these certificate formats:

Certificate type	Filename extension
X.509 DER encoded	.cer or .crt
PKCS12 DER encoded	.p12 or .pfx
PKCS7, DER or PEM encoded	.p7r, .p7b, .p7m, .p7c, or .p7s

Once in the Keychain, valid certificates can be used by compatible applications, including Mail.

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