Survey of Text CAPTCHA Techniques and Attacks

Survey of Text CAPTCHA Techniques and Attacks

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2015 by IJETT Journal
Volume-22 Number-6
Year of Publication : 2015
Authors : Simran Sharma, Nidhi Seth
DOI :  10.14445/22315381/IJETT-V22P251

Citation 

Simran Sharma, Nidhi Seth"Survey of Text CAPTCHA Techniques and Attacks", International Journal of Engineering Trends and Technology (IJETT), V22(6),240-245 April 2015. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract
CAPTCHA is a challenge-response test most often placed within web forms to determine whether the user is human. The purpose of CAPTCHA is to block automated scripts that post spam content everywhere they can. This paper presents a survey of Optical Character Recognition applications and further focuses on three important applications of Optical Character Recognition, CAPTCHAS. There is a constant need to improve current CAPTCHAs and to develop new CAPTCHAs in order to safely secure against developing programs which can create thousands of e-mail accounts used for malicious purposes, stuff online polls with ballots, and develop worms and viruses contained in emails.

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Keywords
HIP, Challenge Response, CAPTCHAS, OCR, Security.