old_contents: "use strict";
  
  module.exports = function(size){
  
      var crypto = require('crypto');
  
      return crypto.createHash('sha512').update(
          crypto.randomBytes(size)
      ).digest('base64');
  
  };
  
new_contents: "use strict";
  
  module.exports = function(size){
  
      var crypto = require('crypto');
  
      return crypto.createHmac('sha512', new Date().toString()).update(
          crypto.randomBytes(size)
      ).digest('base64');
  
  };
  
subject: Change encoding algorithm for creating tokens