title: what is default cipher for PEM format in OpenSSL?
body: <p>I generate key/cert using openssl</p>
  
  <pre><code>openssl.exe req -x509 -days 1000 -newkey rsa:1024 -keyout key.pem -out cert.pem
  </code></pre>
  
  <p>It prompts for a password. I guess that the password is used for key encryption. However I haven't specified any cipher. What cipher is used in this case?</p>