title: Mcrypt for rijndael-128 : how do I set the Initialization Vector?
body: <p>I would like to encrypt a file using AES (rijndael 128) with the mcrypt command line tool.
  I would like to set the initialization vector to a specific value.  How can I do this?</p>
  
  <p>I am pretty new to encryption, btw.</p>
  
  <p>Thanks!</p>