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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?

1 Answers1

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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?