title: Encrypt a string twice... Good, Bad or Ugly?
body: <p>I'm working on an encryption class that is using Rijndael algorithm (C#, ASP.Net 4.5), and out of curiosity I was wondering how beneficial would it be to encrypt the string twice. I mean Encrypt the string with a key and then Encrypt the resulting encryption with another key?</p>
  
  <p>Does this make it that much more secure (I know nothing is ever secure and there could be other holes in my software that could be used to exploit)? Is it worth the CPU overhead (not sure how heavy this is but I can't imagine it would light)?</p>
  
  <p>I was looking for some suggestions online but was not able to find any. Any thoughts? </p>