Quick post: Generate a private / public key with openssl


Here’s a way to quickly generate a private and public key:

In Windows openssl needs a file in which to produce random data:

Running this results in the following CLI output:

openssl cli output


And these two files will be generated:

  • dkim.pem
  • dkim.der

Since I work on a Windows pc, I have a very simple batch file that quickly generates one for me:


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