Filters








575 Hits in 3.0 sec

CAPTCHA accessibility study of online forums

Joanne Kuzma, Sue Barnes, Klaus Oestreicher
2011 International Journal of Web Based Communities  
This study analyzes 150 online forums to determine if sites use CAPTCHAs, and what types are used.  ...  The rise of online forums has benefited disabled users, who take advantage of better communications and more inclusion into society.  ...  Conclusion The results of this study show a dearth of online forums that provide for full levels of accessibility for their disabled viewers who wish to sign up for the services.  ... 
doi:10.1504/ijwbc.2011.041201 fatcat:aiox3cbk2vctdi3wgdxzcombse

Design of Secure Multilingual CAPTCHA Challenge

M. Tariq Banday, Shafiya Afzal Sheikh
2015 International Journal of Web Portals  
The results of experiments, security tests, and users study with the CAPTCHA tests generated through the proposed technique have validated its design, security, usability, and accessibility.  ...  It discusses the design, algorithm, pseudo code, and working of a secure multilingual text CAPTCHA script having desired security, accessibility and usability features.  ...  online services.  ... 
doi:10.4018/ijwp.2015010101 fatcat:5m3rv4p47bbbvikjqrqmkmjyaq

Doing Internet research with hard-to-reach communities: methodological reflections on gaining meaningful access

Mareile Kaufmann, Meropi Tzanetakis
2020 Qualitative Research  
access to online subjects.  ...  This article contributes to scholarship on digital sociology by addressing the methodological challenge of gaining access to hard-to-reach online communities.  ...  Earlier versions of this article were presented at the annual meeting of the Pan-European Conference on International Relations at the University of Economics, Prague and a seminar at the University of  ... 
doi:10.1177/1468794120904898 pmid:33281502 pmcid:PMC7683880 fatcat:ur5gakcso5dc3ebxomsfv4cgua

CAPTCHA smuggling

Manuel Egele, Leyla Bilge, Engin Kirda, Christopher Kruegel
2010 Proceedings of the 2010 ACM Symposium on Applied Computing - SAC '10  
CAPTCHAs protect online resources and services from automated access.  ...  To perform CAPTCHA smuggling, the attacker slips CAPTCHA challenges into the web browsing sessions of unsuspecting victims, misusing their ability to solve these challenges.  ...  Similarly, blogging and forum sites make use of CAPTCHAs to prevent botgenerated postings.  ... 
doi:10.1145/1774088.1774483 dblp:conf/sac/EgeleBKK10 fatcat:5qzt7ocwwjfwjpfgei3ebz6cca

La sécurité informatique

Martin Abadi
2011 Les Leçons inaugurales du Collège de France  
Thus, CAPTCHAs can increasingly be understood and evaluated in purely economic terms; the market price of a solution vs the monetizable value of the asset being protected.  ...  We examine the market-side of this question in depth, analyzing the behavior and dynamics of CAPTCHA-solving service providers, their price performance, and the underlying labor markets driving this economy  ...  We also thank Jonathan Wilkins for granting us access to reCaptchaOCR, Jon Howell and Jeremy Elson for discussions about the Asirra CAPTCHA, and the volunteers who assisted in manual identification of  ... 
doi:10.4000/lecons-cdf.443 fatcat:sxjqeq56zra6vmi7cqci566r2u

CrimeBB

Sergio Pastrana, Daniel R. Thomas, Alice Hutchings, Richard Clayton
2018 Proceedings of the 2018 World Wide Web Conference on World Wide Web - WWW '18  
Analysing these forums enables us to better understand the behaviours of offenders and pathways into crime.  ...  We describe CrimeBot, a crawler designed around the particular challenges of capturing data from underground forums.  ...  The database schema covers the common structure of online forums.  ... 
doi:10.1145/3178876.3186178 dblp:conf/www/PastranaTHC18 fatcat:h4cirvfy4fa3hko7l5z3vpb5pa

Evaluating existing audio CAPTCHAs and an interface optimized for non-visual use

Jeffrey P. Bigham, Anna C. Cavender
2009 Proceedings of the 27th international conference on Human factors in computing systems - CHI 09  
In a subsequent study, the optimized interface increased the success rate of blind participants by 59% on audio CAPTCHAs, illustrating a broadly applicable principle of accessible design: the most usable  ...  This paper demonstrates in a large study of more than 150 participants that existing audio CAPTCHAs are clearly more difficult and time-consuming to complete as compared to visual CAPTCHAs for both blind  ...  RELATED WORK CAPTCHAs were developed in order to control access to online resources and prevent access by automated agents that may seek to abuse these resources [21] .  ... 
doi:10.1145/1518701.1518983 dblp:conf/chi/BighamC09 fatcat:qvdoxnjvo5dynetgcirgvti7c4

PathMarker: protecting web contents against inside crawlers

Shengye Wan, Yue Li, Kun Sun
2019 Cybersecurity  
By adding a marker to each Uniform Resource Locator (URL), we can trace the page that leads to the access of this URL and the user identity who accesses this URL.  ...  We deploy our approach on an online forum website, and the evaluation results show that PathMarker can quickly capture all 6 open-source and in-house crawlers, plus two external crawlers (i.e., Googlebots  ...  However, the visiting logs of real users cannot be shared since our data policy promised the data will only be used in this study.  ... 
doi:10.1186/s42400-019-0023-1 fatcat:ckt3ah2pwjg4bhqunft3aaz5um

A Novel Animated CAPTCHA Technique based on Persistence of Vision

Shafiya Afzal Sheikh, M. Tariq Banday
2022 International Journal of Advanced Computer Science and Applications  
The security analysis and usability study have demonstrated user-friendliness, vast accessibility, and robustness.  ...  This research proposes a novel animated CAPTCHA technique based on the persistence of vision, which shows text characters in multiple layers in an animated image.  ...  ACKNOWLEDGEMENT This work has been supported by Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India under its file no. EMR/2016/006987.  ... 
doi:10.14569/ijacsa.2022.0130242 fatcat:hfy2pvigdzf6rbfq2y3mq53vdm

Captchæcker: Reconfigurable CAPTCHAs based on automated security and usability analysis

Yousra Javed, Maliha Nazir, Muhammad Murtaza Khan, Syed Ali Khayam, Shujun Li
2011 2011 4th Symposium on Configuration Analytics and Automation (SAFECONFIG)  
So far, balancing this trade-off remains an art rather than a science, as we do not have any automated tools to evaluate the security and usability of CAPTCHAs and then to configure the CAPTCHA generation  ...  The proposed framework will allow dynamic reconfiguration of a CAPTCHA scheme after its securityusability goal is changed or its security is compromised due to an attack.  ...  They have been widely deployed on web sites, especially web forums and online registration pages.  ... 
doi:10.1109/safeconfig.2011.6111665 dblp:conf/safeconfig/JavedNKKL11 fatcat:v45i7k3wdjbwro35dkaep5yr44

Captcha Recognition and Robustness Measurement using Image Processing Techniques

Ramya T
2013 IOSR Journal of Computer Engineering  
This paper carries out a systematic study of various Text-based Captchas and proposes the application of Forepart based prediction and Character-Adaptive Masking to break these captchas to evaluate their  ...  Network security prevents and monitors unauthorized access, misuse, modification, or denial of a computer network and network-accessible resources.  ...  Acknowledgements The authors wish to thank all the reviewers of the work for their valuable suggestions and advices to successfully complete the work.  ... 
doi:10.9790/0661-1316772 fatcat:gkglexhyivhihkr26mhh6h2klu

NOMAD: Towards non-intrusive moving-target defense against web bots

Shardul Vikram, Chao Yang, Guofei Gu
2013 2013 IEEE Conference on Communications and Network Security (CNS)  
Although the technique of CAPTCHA has been widely used to defend against web bots, it requires users to solve some explicit challenges, which is typically interactive and intrusive, resulting in decreased  ...  NO-MAD prevents web bots from automating web resource access by randomizing HTML elements while not affecting normal users.  ...  To examine possible effect to users, we plan to conduct a deep user study, and try to create a more accessible design leveraging audio elements in our future work.  ... 
doi:10.1109/cns.2013.6682692 dblp:conf/cns/VikramYG13 fatcat:yl64qosds5gjjhyhd7uhxhzc3q

Got Bots? Practical Recommendations to Protect Online Survey Data from Bot Attacks

Andie Storozuk, Marilyn Ashley, Véronic Delage, Erin A. Maloney
2020 The Quantitative Methods for Psychology  
Online data collection is fast, provides access to hard-to-reach populations, and is often less expensive than in-lab recruitment.  ...  Finally, we discuss the implications of bot-generated data for the integrity of online research and the imminent future of bots in online data collection.  ...  Nonetheless, researchers should always include a CAPTCHA at the beginning of each online survey to prevent less sophisticated bots from accessing their survey.  ... 
doi:10.20982/tqmp.16.5.p472 fatcat:rwkl2o6ntngilmsklznovh3uzm

Siimple, Robust & User Friiendlly CAPTCHA 'InstaCap' for Web Securiity

Tanvir Ahmed, Kaiser Ahmed Tushar, Sunjida Islam Nova, Mahbubur Rahman
2016 International Journal of Hybrid Information Technology  
This paper will focus on a new and simple model of CAPTCHA to defend bot-attack. This model makes a user easily to pass and also amuse them with its simplicity.  ...  Nowadays security matter is a great challenge in web-based systems and we are using various types of HIP to defend malwares in web.  ...  User Studies & Results We arrange a user study event for our proposed model via online with the help of another project to observe real users feedback.  ... 
doi:10.14257/ijhit.2016.9.1.15 fatcat:eu6aeufv2zbbjhy37ozdajdgfy

Design And Development Of Biliran Province Official Website

Noel P. Tancinco Reymon M. Santianez
2016 Zenodo  
The methods used in gathering data required for the study are conducting interviews, observation, and research.  ...  The online system design was based on the capability to handle series of data that are effective to Biliran Province Official Website.  ...  Accessibility of Information As one of the significant objectives of the study, the proponents ensure that the accessibility of information is present on the system.  ... 
doi:10.5281/zenodo.59759 fatcat:a6e2if7kwjbd3e3olap4t5vz7y
« Previous Showing results 1 — 15 out of 575 results