Persian is an Indo-European language written using Arabic script, and is an official language of Iran, Afghanistan, and Tajikistan. Transliteration of Persian to English—that is, the character-bycharacter mapping of a Persian word that is not readily available in a bilingual dictionary—is an unstudied problem. In this paper we make three novel contributions. First, we present performance compar...

The research presented in this thesis aims to extend the capabilities of human interaction proofs in order to improve security in web applications and services. The research focuses on developing a more robust and efficient Completely Automated Public Turing test to tell Computers and Human Apart (CAPTCHA) to increase the gap between human recognition and machine recognition. Two main novel app...

Over the last decade, it has become well-established that a captcha’s ability to withstand automated solving lies in the difficulty of segmenting the image into individual characters. The standard approach to solving captchas automatically has been a sequential process wherein a segmentation algorithm splits the image into segments that contain individual characters, followed by a character rec...

The internet and web security are integral aspects of our daily lives. Many commercial firms provide clients with services. For access, it is assumed that only the genuine user, who a human, will register. Yet automated hacking programs can also do registrations fake data consume lot bandwidth, slowing down or occasionally even shutting websites, leading to Distributed denial-of-service (DDOS) ...

A Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA) is a simple test that used on websites differentiate between human users automated attacks indulge in spamming other fraudulent activities. text-based CAPTCHA the most popular security technique by many Internet, such as Microsoft, Google eBay, secure their sites from attacks. By design, however, unable legit...