title: RSA: Encrypting message using multiple keys
body: <p>Is it possible to get additional security by encrypting a message using 2 or more RSA keys?</p>
  
  <p><b>EDIT:</b> <i>A few clarifications:</i></p>
  
  <p>The context I am most interested in doing this for is encrypting a randomly generated symmetric key.</p>
  
  <p>I don't want to limit the question to encrypting twice in a row; the purpose is to avoid the high computational cost of large RSA keys. Using less straightforward tactics such as breaking the message into parts and encrypting them separately should be considered as an option. </p>
  
  <p>It should be assumed that getting only part of the message is acceptable.</p>
  
  <p><i><b>If you know of any publications where this is discussed specifically by an expert, or algorithms that use multiple RSA keys, then please contribute.</b></i></p>