title: Tips to generate strong RSA keys
body: <p>Is there any documentation including tips to generate strong RSA key?</p>
  
  <p>I mean not just ' use XXX utility with -X flag'.</p>
  
  <p>I mean some rules in theory. For example, module n should be not less then 1024 bit, etc.</p>
  
  <p>Can anybody tell me?</p>