New CAPTCHA Approach for Securing Online Social Network and Webpages Using Extended Finite Automata (XFA CAPTCHA)

Document Type : Original Article

Authors

• menna-allah magdy mostafa ¹
• Hamdy M. Mousa ²
• Medhat A. Tawfik ³

¹ Computer Science Department, Faculty of Computers and Information, Menoufia University, Shebin Elkom 32511, Egypt

² CS Dept., Faculty of Computers and Information, Menoufia University

³ Department of Computer Science, Menoufia University, Egypt