1. Department of Electronics, Communications and Computers, Faculty of Engineering; Helwan University; 1, Sherif St., Helwan Cairo P.O. 11792 Egypt
2. Department of Mathematics; Chaudhary Charan Singh University; Meerut 250 005 Uttar Pradesh India
3. Center for Security, Theory and Algorithmic Research; International Institute of Information Technology; Hyderabad 500 032 Telangana India
4. Department of Mathematics; Indian Institute of Technology; Kharagpur 721 302 West Bengal India
5. Department of Computer Science and Engineering; Indian Institute of Information Technology; Chittoor Sricity 517 588 Andhra Pradesh India