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The tutorial I'm following to create and sign certificates bounces between creating .key and .key.pem files with the -keyout option.

For example: master-ca.key.pem and openvpn-ica.key and again vpn-server.key.pem.

Does it matter and is there a standard?

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This question has already been answered before. See this post for a great explanation: What is a Pem file and how does it differ from other OpenSSL Generated Key File Formats?

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  • Thank you, I saw that. A .pem is a just container and it says it doesn't really matter. But as far as readability and best practices go, which way is it more typically created? Commented Dec 4, 2016 at 22:18
  • As stated in this post, *.key is typically used for the private key, *.pem for the certificate (chain). Commented Dec 4, 2016 at 22:20

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