title: Google Spreadsheet: Encrypt cell content with Google Apps Script
body: <p>I have a Google Spreadsheet and would like to encrypt the content of a few cells (I do not care which encryption method is being used as long as there is an equivalent decryption method for iOS).</p>
  
  <p>Unfortunately there are no built-in encryption functions in Google Apps Script.</p>
  
  <p>For this reason I would like to use a open source Javascript library like <a href="http://code.google.com/p/crypto-js/" rel="noreferrer">Crypto-JS</a> and <a href="https://github.com/bitwiseshiftleft/sjcl" rel="noreferrer">sjcl</a>.</p>
  
  <p>How can I use one of these libraries with Google Apps Script? </p>
  
  <p>In the Google Apps Script documentation, I have not found any clue on how to use external JavaScript libraries with my Google Apps Script.</p>