World of Computer Science and Information Technology Journal  © 2011. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use,   distribution, and reproduction in any medium, provided the original author and source are credited.  A proposed Modified Data Encryption Standard algorithm by Using Fusing Data Technique Alaa H. AL-Hamami, Computer Sciences Dept., Amman Arab University, Jordan. Mohammad A. AL-Hamami, Computer Sciences Dept., Delmon University, Bahrain. Soukaena H. Hashem, Computer Sciences Dept., University of Technology, Iraq.