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Position-Encoding Convolutional Network to Solving Connected Text Captcha
2021
Journal of Artificial Intelligence and Soft Computing Research
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Meanwhile, the security features, which prevent characters from segmentation and recognition, extensively increase the complexity of CAPTCHAs. ...
We validate PosConv on six text-based CAPTCHA schemes, and it achieves state-of-the-art or competitive recognition accuracy with significantly fewer parameters and faster convergence speed. ...
For Microsoft's two-layer CAPTCHA, the researchers presented a mixed segmentation method based on the professional analysis of the security feature: a customized algorithm to split the hollow and solid ...
doi:10.2478/jaiscr-2022-0008
fatcat:xlyywycmgrd7labdypmpxwnola
New Image-based CAPTCHAs based on Neural Style Transfer
2019
IET Information Security
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Two image-based CAPTCHAs, Grid-CAPTCHA and Font-CAPTCHA, based on neural style transfer are proposed. ...
To evaluate the effectiveness of this techniques on enhancing CAPTCHA security, they conducted a comprehensive field study and compared them to similar mechanisms. ...
Acknowledgments The authors thank the reviewers for their careful reading of this paper and for their helpful and constructive comments. ...
doi:10.1049/iet-ifs.2018.5036
fatcat:s2zvr74cyjhljjsvuueet2zrgy
Design and Comparison of Advanced Color based Image CAPTCHAs
2013
International Journal of Computer Applications
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Various types of CAPTCHAs are used, which mostly requires users to enter the strings of characters that appear in distorted form on the screen. ...
This paper describes in detail the proposed CAPTCHA technology principle, method of implementation, variations and comparison of the accuracy rates. ...
Harsh Verma HOD Computer Science for providing various research papers and giving their valuable suggestions. Thanks are also given to Dr. Dinesh, Principal, A.B. College, for his valuable comments. ...
doi:10.5120/10005-4870
fatcat:3tyfwmsxgnahnb4yhvvgdit5cy
Character Image Semantic-Based CAPTCHA
2015
International Journal of Future Computer and Communication
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Benchmarks will be discussed after conducting both Usability and Security tests with a clear set of results that show the accuracy of the proposed solution compared to other existing ones. ...
does not usually meet the definition of a CAPTCHA. ...
For instance, researchers have developed an attack against Microsoft's Hotmail CAPTCHA that yields a 60% success rate [8] . ...
doi:10.7763/ijfcc.2015.v4.387
fatcat:4ep4dt27mrbczg7ubapmqzvaqe
Designing New CAPTCHA Models Based on the Cognitive Abilities of Artificial Agents
2017
Research in Computing Science
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Also, they can provide an idea of which fields in artificial intelligence are the most explored and which could be researched in the near future. ...
The current state of technology is still not enough to reproduce some human cognitive abilities, and the identification of those abilities is the basis for the design of new CAPTCHA models. ...
In this research we left out the security context and we use the CAPTCHA as an opportunity for some cognitive computing researches. ...
doi:10.13053/rcs-138-1-13
fatcat:6qiritjakndb7otg5pdbcdmbfa
Deciphering complex text-based CAPTCHAs with deep learning
2020
Indian Journal of Science and Technology
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CAPTCHA is a mechanism to distinguish humans from bots. It has become standard means of protection from the misuse of resources on World Wide Web. ...
A complex text-based CAPTCHA scheme with varying number of letters: 3, 4 and 5 letters is decoded with the overall precision of 77.5%, 64.2% and 51.9% respectively. ...
In (12) , the method used by Researchers' is based on two neural architectures along with two different feature extraction techniques: 1-Segmented Character Recognition and 2-Methodology used by researchers ...
doi:10.17485/ijst/v13i13.126
fatcat:gu6et7drtvedvgapkmv4ghlt7q
Color Channel CAPTCHA: A Secure Scheme for Cloud Environment
2019
VOLUME-8 ISSUE-10, AUGUST 2019, REGULAR ISSUE
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The experimental study has been conducted among 41 participants on both usability and performance of color channel CAPTCHA. ...
This simple challenge is completed by click on the specified circles in the given order with very less solving time, while compared to the state of the art. ...
This work has been supported by the University of Madras (India) under University Research Fellow Grant No; GCCO/URF/Comp.Science/2019-20/323. ...
doi:10.35940/ijitee.a4712.119119
fatcat:3yqrz6spgje7xo7ae6vljgzlzy
Development of two novel face-recognition CAPTCHAs: A security and usability study
2016
Computers & security
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With this study, we contribute to research through (1) the development of two new face recognition CAPTCHAs (Farett-Gender and Farett-Gender&Age), (2) the security analysis of both procedures, and (3) ...
The need for developing alternative types of CAPTCHAs which improve both, the current security and usability levels, has been emphasized by several researchers. ...
This research was supported by the "Bavarian State Ministry of Education, Science and the Arts" as part of the FORSEC research association. ...
doi:10.1016/j.cose.2016.03.007
fatcat:57us2e5u35cazd4a65cax3ab3e
Simple and Easy: Transfer Learning-Based Attacks to Text CAPTCHA
2020
IEEE Access
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we use these two kinds of generated samples to pre-train the models, respectively. ...
Instead, transfer learning is the key factor; it reduces the cost of data preparation while preserving the model's attack accuracy. INDEX TERMS CAPTCHA, security, deep learning, transfer learning. ...
As one of the most important tools for preventing computer attacks, the security aspect of text-based CAPTCHAs has attracted considerable attention from researchers and industry practitioners. ...
doi:10.1109/access.2020.2982945
fatcat:2di2z5vggrb3pojg7dm7daqfe4
A deep learning‐based attack on text CAPTCHAs by using object detection techniques
2021
IET Information Security
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The experiments show that the attack can break a wide range of real-world text CAPTCHAs deployed by the 50 most popular websites on Alexa.com and that the method achieves a high attack accuracy with only ...
The attack was also evaluated on four click-based CAPTCHAs that cannot be attacked in the end-to-end manner used by previous attacks, and the results demonstrated that within one step, the proposed approach ...
ACKNOWLEDGEMENTS The authors thank the reviewers for their careful reading of this study and for their helpful and constructive comments. ...
doi:10.1049/ise2.12047
fatcat:mv63swxrj5ap5kowsdvh7untmy
AgeCAPTCHA: an Image-based CAPTCHA that Annotates Images of Human Faces with their Age Groups
2014
KSII Transactions on Internet and Information Systems
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As a result, we have not only verified the effectiveness of our scheme but also increased the applicability of image annotation CAPTCHAs. ...
However, this approach has not been widely used because of its weak security and the fact that it can be applied only to annotate for a specific type of attribute clearly separated into mutually exclusive ...
Therefore, the security of CAPTCHAs should not be based on the database's secrecy [10, 19] . ...
doi:10.3837/tiis.2014.03.021
fatcat:npxpyobl6vb7vlfcntjpm24yoi
Protecting Web 2.0 Services from Botnet Exploitations
2010
2010 Second Cybercrime and Trustworthy Computing Workshop
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Main RIA technologies can be used to implement Captcha are Ajax based on JavaScript, Adobe's Flex based on Flash, and Microsoft's Silverlight. ...
We deploy two forms of Captcha, one is the popular text-based Captcha and one is our enhanced Captcha as described in Chapter 5. We study the following hypotheses. Figure 6 .3 [38] . ...
doi:10.1109/ctc.2010.10
fatcat:cfoopseg4vc3lf7sfd2twrmfoy
Security and Trust for the Norwegian E-Voting Pilot Project E-valg 2011
[chapter]
2009
Lecture Notes in Computer Science
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This paper discusses the security and trust aspects of the proposal put forward to the KRD. ...
The consortium proposed a solution based on an open source approach on the one side, and the knowledge and experience in the field of Cybernetica on the other side. ...
Acknowledgments The authors would like to thank all their colleagues who have contributed so far to the E-valg 2011 tender. ...
doi:10.1007/978-3-642-04766-4_15
fatcat:g7hj2zek2vc5lcai3v6myfa5dm
Security Threats with Associated Mitigation Techniques in Cloud Computing
2013
International Journal of Applied Information Systems
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It focuses on technical security issues arising from the usage of cloud services and also provides an overview of key security issues related to cloud computing with the view of a secure cloud architecture ...
Cloud Computing emerges as one of the hottest topic in the field of information technology. ...
Two additional layers of trust: internal trust layer and contracted trust layer have been proposed to enhance security in a cloud computing environment. ...
doi:10.5120/ijais13-450935
fatcat:ciag4rxhgnh3dj4df7nnwqbpoq
Taxonomy of Cloud Security
2013
International Journal of Computer Science Engineering and Applications
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The attack, if it occurs on Cloud, will allow the attackers to compromise the secure traffic between the websites and browsers of various Cloud users. ...
on Cloud security, and the defence taxonomy gives a classification of the various counter measures that can be taken to protect the Cloud environment from such attacks. ...
denial of service attack is from one of the application layer"s security attackson the Cloud application layer. ...
doi:10.5121/ijcsea.2013.3505
fatcat:laoqx3yeazah7blsprybzc3ofi
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