I thought of implementing DES modes of operation as a project...But my guide asked to change or to modify the DES algorithm in such a way to overcome drawbacks of DES...So is there any way to do changes?IF so how?and could you please give me idea on how to bring changes in any of 5 modes of DES.please help me... Thank you
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Main drawbacks of DES are:
Changing any of these will imply heavy changes, not little tweaking. Doing that while maintaining or increasing security is no mere feat... and it has been done. It was called the AES competition and involved dozens of cryptographers devoting several years of thinking time to the subject. Therefore, to fulfill your guide instruction to the letter, the most reasonable way is to ditch DES altogether, and use AES.