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2

Excellent answer; but I'll add two notes: First, for historical reasons the extension ".pfx" is sometimes used for PKCS #12 files (see Wikipedia). Second, in the screenshots there's a disclosure triangle next to the "com.apple.idmsa..." certificate; clicking that would reveal the corresponding private key that makes it show up in "My Certificates" and allows it to be used for authentication.
– Gordon Davisson
Commented Jul 9, 2015 at 22:24
How can I move the key file (that appears after clicking the triangle) from Keychain in one computer to a new computer?
– Pier
Commented Dec 30, 2016 at 2:46
1

@Pier Welcome to SuperUser. Please ask your question by posting it as your own Question post, rather than asking in a comment.
– Spiff
Commented Dec 30, 2016 at 3:01
+10000000000000000, one of most useful answers on StackExchange
– Whimusical
Commented Jun 21, 2020 at 10:48

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create code fences with backticks ` or tildes ~
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like so
```
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