A Survey on Breaking Technique of Text‐Based CAPTCHA

J Chen, X Luo, Y Guo, Y Zhang… - Security and …, 2017 - Wiley Online Library
The CAPTCHA has become an important issue in multimedia security. Aimed at a commonly
used text‐based CAPTCHA, this paper outlines some typical methods and summarizes the …

CAPTCHA and its Alternatives: A Review

M Moradi, MR Keyvanpour - Security and Communication …, 2015 - Wiley Online Library
Nowadays, because of the undeniable impact of the Internet on all aspects of human life,
security preserving has received more attention. To reach an acceptable level of security …

Image-based CAPTCHA generation system

JZ Wang, R Datta, J Li - US Patent 7,929,805, 2011 - Google Patents
In a system and method for the generation of attack-resistant, user-friendly, image-based
CAPTCHAs (Completely Automated Public test to Tell Computers and Humans Apart) …

I am robot:(deep) learning to break semantic image captchas

S Sivakorn, I Polakis… - 2016 IEEE European …, 2016 - ieeexplore.ieee.org
Since their inception, captchas have been widely used for preventing fraudsters from
performing illicit actions. Nevertheless, economic incentives have resulted in an arms race …

[PDF][PDF] Botz-4-sale: Surviving organized DDoS attacks that mimic flash crowds

S Kandula, D Katabi, M Jacob, A Berger - Proceedings of the 2nd …, 2005 - usenix.org
Recent denial of service attacks are mounted by professionals using Botnets of tens of
thousands of compromised machines. To circumvent detection, attackers are increasingly …

Research on deep learning techniques in breaking text-based captchas and designing image-based captcha

M Tang, H Gao, Y Zhang, Y Liu… - IEEE Transactions on …, 2018 - ieeexplore.ieee.org
The ability of hackers to infiltrate computer systems using computer attack programs and
bots led to the development of Captchas or Completely Automated Public Turing Tests to …

Attacks and design of image recognition CAPTCHAs

BB Zhu, J Yan, Q Li, C Yang, J Liu, N Xu, M Yi… - Proceedings of the 17th …, 2010 - dl.acm.org
We systematically study the design of image recognition CAPTCHAs (IRCs) in this paper.
We first review and examine all existing IRCs schemes and evaluate each scheme against …

Imagination: a robust image-based captcha generation system

R Datta, J Li, JZ Wang - Proceedings of the 13th annual ACM …, 2005 - dl.acm.org
We propose IMAGINATION (IMAge Generation for INternet AuthenticaTION), a system for the
generation of attack-resistant, user-friendly, image-based CAPTCHAs. In our system, we …

[图书][B] Reliable Face Recognition Methods: System Design, Impementation and Evaluation

H Wechsler - 2007 - Springer
Much of the existing face recognition systems operate in 2D. As the search for improved
recognition performance intensifies, alternative methods, eg, 3D, are under consideration …

Is image-based CAPTCHA secure against attacks based on machine learning? An experimental study

FH Alqahtani, FA Alsulaiman - Computers & Security, 2020 - Elsevier
The completely automated public Turing test to tell computers and humans apart
(CAPTCHA) is among the most common methods of authentication used by websites and …