PEM File "CERTIFICATE" vs "PUBLIC KEY"

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One is a public cert, the other is a key. As Federico stated in comments, this question addresses it pretty well.

That being said, what are you trying to do?

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Alex Rothberg
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Alex Rothberg

Updated on September 18, 2022

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  • Alex Rothberg
    Alex Rothberg over 1 year

    I have a PEM file that looks like:

    -----BEGIN CERTIFICATE-----
    ...
    -----END CERTIFICATE-----
    

    which I can convert to another PEM file using: openssl x509 -in key.crt -pubkey -noout. The new PEM file now looks like:

    -----BEGIN PUBLIC KEY-----
    ...
    -----END PUBLIC KEY-----
    

    my question is, what is the difference between these two files?