title: String manipulation using MD5 in rails 3
body: <p>I have a big string</p>
  
  <pre><code>approx 4000 characters
  </code></pre>
  
  <p>i want encrypt and decypt it using MD5 because of i want to do convert in a small string please help me a lot of finding i found <code>Base64</code> but it is not our solution please any one help me</p>
  
  <pre><code>my_string="abcdefghhhhhhhhhhhhhhhhhhhhhh"
        Base64.encode64(my_string)
  </code></pre>
  
  <p>it gives us very lengthy string. </p>