title: How to generate a unique key for a string content?
body: <p>I am looking for an algorithm which creates a unique key for a string.
  The generated key for the string should be the same for every instance of execution of the code.
  I want to serialize the key and the string into a file and deserialize (binary file)it on some other platform like an android application , set top box, etc...</p>
  
  <p>Can some one help me in this regards?</p>