CAPTCHA-Completely Automated Public Turing test to tell Computers and Humans Apart-TECHNOLOGY-RESEARCH PAPER-SOFTWARE


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type of challenge-response test used in computing to determine whether or not the user is human.

Re: CAPTCHAs-UnderstandingCAPTCHA Solving Services in an Economic Context.
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Abstract Reverse Turing tests, or CAPTCHAs, have become an ubiquitous defense used to protect open Web resources from being exploited at scale. An effectiveCAPTCHAresists existing mechanistic software solving, yet can be solved with high probability by a human

Captcha : Telling humans and computers apart automatically
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Page 1. 1 School of Computer Science Carnegie Mellon UniversityCAPTCHA : Telling Humans and Computers Apart Automatically Luis von Ahn Manuel Blum Nicholas Hopper John Langford Page 2. 2 A program that can tell whether its user is a human or a computerCAPTCHA(2000)

A new graphical password scheme against spyware by usingCAPTCHA .
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The security and usability problems inherent in text-based password schemes have resulted in the development of graphical password schemes as a possible alternative. However, most of the current graphical password schemes are vulnerable to spyware which is a

Persian/Arabic BaffletextCAPTCHA .
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Abstract: Nowadays, many daily human activities such as education, trade, talks, etc are done by using the Internet. In such things as registration on Internet web sites, hackers write programs to make automatic false registration that waste the resources of the web sites

Towards a universally usableCAPTCHA
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ABSTRACT CAPTCHAS are widely used on websites to differentiate between humans and computers. Audio CAPTCHAs provide an alternative interface that is accessible to blind users and users with low vision who are unable to see visual CAPTCHAs. We present a

Text-basedCAPTCHAalgorithms
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Abstract ACAPTCHAis a test that a computer can automatically administer to determine if a user is a human or a computer. Several aural and visual CAPTCHAs have already been developed, but a completely textfbasedCAPTCHAis still elusive,[n this paper 1 describe the

Survey of different types ofCAPTCHA
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Automated Public Turning Test to tell Computers and Humans Apart.CAPTCHAis basically used as a protection from these malicious programs like Bot. Now a days for web security we are using different type ofcaptcha . In this paper we describe all type ofcaptcha

A review of bot protection usingCAPTCHAfor web security
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Abstract: Today several daily activities such as communication, education, E-commerce, Entertainment and tasks are carried out by using the internet. To perform such web activities users have to register regarding the websites. In registering websites, some intruders write

A dual-use speechCAPTCHA : Aiding visually impaired web users while providing transcriptions of Audio Streams
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Abstract This work focuses on development of an alternative auralCAPTCHAtechnology based on a speech transcription task. The principal goals are (1) to provide a better quality of service for visually impaired web users who currently have few alternatives for accessing

Improvedcaptchamethod
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ABSTRACT ACAPTCHAis a program that can tell whether its user is a human or a computer. CAPTCHAs are used by many websites to differentiate between the bots (automated program) and the human. The main motive behind using theCAPTCHAis to

Strongcaptchaguidelines v1. 2
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Abstract An introduction to developing secureCAPTCHA(Completely Automated Public Turing test to tell Computers and Humans Apart) 1 systems. In addition to describing common weaknesses inCAPTCHApuzzles, focus is placed on the system as a whole,

Dynamic cognitive gamecaptchausability and detection of streaming-based farming
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AbstractCAPTCHAs are a widely deployed mechanism to distinguish a legitimate human user from a computerized program trying to abuse online services. Attackers, however, have devised a clever and an economical way to bypass the security provided by CAPTCHAs by

Cyber security using arabiccaptchascheme.
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Abstract: Bots are programs that crawl through the web site and make auto registrations. CAPTCHAs, using Latin script, are widely used to prevent automated bots from abusing online services on the World Wide Web. However, many of the existing English based

An image-basedCAPTCHAscheme exploiting human appearance characteristics.
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Abstract CAPTCHAs are automated tests that are there to avoid misuse of computing and information resources by bots. Typical text-based CAPTCHAs are proven to be vulnerable against malicious automated programs. In this paper, we present an image-based

understandingCAPTCHA : text and audio basedCAPTCHAwith its applications
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AbstractCAPTCHAs are short for Completely Automated Public Turing test to tell Computer and Humans Apart. The purpose of aCAPTCHAis to block form submissions from spam bots automated scripts that harvest email addresses from publicly available web

Moveselect: 2-layerCAPTCHAbased on cognitive psychology for securing web services
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AbstractNowadays, due to enormous growth of web users many services in the internet including Email, search engine, social networking are provided with free of charge. With the expansion of Web services, denial of service (DoS) attacks by malicious automated

Drag and drop imagecaptcha
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Abstract The massive and automated access to Web resources through robots has made it essential for Web service providers to make some conclusion about whether a user is human or robot. A Human Interaction Proof (HIP) like Completely Automated Public Turing

CAPTCHAbased web security: an overview
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AbstractCompletely Automatic Public Turing test to tell Computers and Humans Apart ( CAPTCHA ) is a HIP (Human interactive Proof) system. CAPTCHAs are used to improve the security of Internet based applications in order to ensure that a web based application which

Random HandwrittenCAPTCHA : Web Security with a Difference
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CAPTCHA . The web survival in this cut-throat competition is impossible without the mechanisms for blocking spam-boats. The spam-boats have now been made intelligent enough to break through machine printed CAPTCHAs. HandwrittenCAPTCHAimage can

Hybrid CollageCAPTCHA
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AbstractAuthentication is indeed at the heart of any secure system. CAPTCHAs, a class of HIPs tests, are a program that tells whether user is a human or a computer. CAPTCHAs currently in use have been broken. Thus, there is a need to employ stronger CAPTCHAs to

Captchaand Its Techniques: A Review
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AbstractCaptcha(Completely Automated public Turing test to tell Computers and Humans Apart) system is used to verify whether a user is human or computer program. Its also known as human Interactive Proof (HIP) and based upon Artificial Intelligence.Captchais a

Leveraging Cognitive Factors in Securing WWW withCAPTCHA .
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Abstract Human Interactive Proofs systems usingCAPTCHAhelp protect services on the World Wide Web (WWW) from widespread abuse by verifying that a human, not an automated program, is making a request. To authenticate a user as human, a test must be

Novel Method for Graphical Passwords usingCAPTCHA
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Abstract-Cyber security is an important issue to tackle. Various user authentication methods are used for this purpose. It helps to avoid misuse or illegal use of highly sensitive data. Text and graphical passwords are mainly used for authentication purpose. But due to various

Two-StepCAPTCHA : Using a Simple Two Step Turing Test to Differentiate between Humans and Bots
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ABSTRACT Growth of Internet and its usage has made web services prone to malicious threats by automated scripts or bots. Completely Automated Public Turing Test to tell Computers and Humans Apart , commonly abbreviated asCAPTCHA is a technique used

An Efficient user Authentication usingCaptchaand graphical passwords-a Survey
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Abstract:CAPTCHAis an acronym for Completely Automated Public Turning Test to tell Computers and Humans Apart.Captchais one of the widely used techniques for preventing malicious program from accessing the web resource automatically. Now a days for web

AutomatedCAPTCHASolving: An Empirical Comparison of Selected Techniques.
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AbstractCAPTCHAs exploit the gap in the ability between a human and a machine to understand the semantics of specific multimedia content, with vast applications in computer security. In this paper we compare two techniques in automatedCAPTCHAsolving for text-

Imagecaptchabased authentication using visual cryptography
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ABSTRACT Anti-phishing mechanisms in the websites currently focus on helping users to verify whether a web site is genuine or not. Phishing on the web pages is an attempt by an individual or a group to threats/hackers trying to retrieve an individuals personal confidential

Visual Cryptography for Authentication UsingCAPTCHA
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Abstract Authenticity of the user is the major issue in todays internet applications such as core banking. Password has been the most used authentication mechanism which is subjected to offline and online dictionary attacks. Today hacking of the databases on the

On Random FieldCAPTCHAGeneration
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AbstractHerein, we propose generating CAPTCHAs through random field simulation and give a novel, effective and efficient algorithm to do so. Indeed, we demonstrate that sufficient information about word tests for easy human recognition is contained in the site marginal probabilities and

Image-basedCAPTCHAwith JACI
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Implementation). JACI is an image-basedCAPTCHAtechnology that requires users to match like images with their partner image in order to pass the test. JACI is not dependant on keyboard interaction which aids some forms of accessibility and does not require

Improved security usingcaptchaas graphical password
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Abstract: Consumers tend to choose unforgettable passwords that are easy for aggressors to guess, but strong system allotted passwords are hard for users to recall. Many protection primitives are based on difficult mathematical complications. Utilizing strong AI problems for

Breaking an Image basedCAPTCHA
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ACAPTCHAis Completely Automated Public Turing test to tell Computers and Humans Apart. An image of distorted letters is dynamically generated. Since the letters are a part of an image and not text, it is difficult for a spam bot or other computer program to read. A

DesigningCAPTCHAfor Web Security Using Rotating and Spiliting Image against OCR Software
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Abstract: Nowadays internet is used for multiple activities by a huge number of people. These activities include communication, e-commerce, education, and entertainment. For many sites users needs to register to enroll website. However this websites are vulnerable.

Non-writer specific handwriting generation for thecaptchaapplication
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Abstract Automated recognition of unconstrained handwriting continues to be a challenging research task. Unavailability of large training datasets adds to these challenges and therefore there is a special interest in generating synthetichuman-likehandwritten

A hybrid method for image taxonomy: Usingcaptchafor collaborative knowledge acquisition
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Abstract We present a new method for image taxonomy. Our formulation shows how the combination of automated metadata-based analysis and knowledge-acquisition tools can help build better image search applications. We build on top of existing metadata-based

The recognition ofCAPTCHA
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AbstractCAPTCHA(Completely Automated Public Turing Test to Tell Computers and Humans Apart) is a completely automated program designed to distinguish whether the user is a computer or human. As the problems of Internet security are worsening, it is of great

Survey of TextCAPTCHATechniques and Attacks
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Abstract CAPTCHAis a challenge-response test most often placed within web forms to determine whether the user is human. The purpose ofCAPTCHAis to block automated scripts that post spam content everywhere they can. This paper presents a survey of Optical

Breaking microsoftsCAPTCHA
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Abstract In this work we analyze the weaknesses of theCAPTCHAscheme used by Microsoft in their registration website. Furthermore, we propose some alternatives to mitigate the weaknesses found. In the first part of this project we built aCAPTCHAdata set and used

A survey onCAPTCHAtechnique based on drag and drop mouse action
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Abstract CAPTCHA Completely Automated Public Turning Test to tell Computers and Humans Apart, it is a one type of test.CAPTCHAis standard internet security they protect online emails and services from being abused by malicious computer program or BOT.

Face-matching basedCAPTCHA : generation and analysis
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Abstract-In the age of internet, with resources such as email services, cloud services being freely available, misuse of the same is bound to happen. Completely Automated Public Turing Test to Tell Computers and Humans Apart orCAPTCHAare small tests that help

Position BasedCAPTCHA : Changing Place Restriction Minimize the Automatic Access
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AbstractAt present day, most people use internet sites to get any type of information and resources and approximately all internet users have login accounts for internet sites to use their resources. For login accounts user must be registered on internet sites and these

Reviewing effectiveness ofCAPTCHA
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Abstract: The massive use of the Internet and WWW by the government and commercial organizations for automation of work has resulted in extensive proliferation of online computing. To avoid online forms being filled by bots or malicious computers the form

Mouse interventionCAPTCHA .
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AbstractCAPTCHA(Completely Automatic Public Turing to tell Computers and Human Apart) has been developed to defend e-commerce systems from the attack of automatic scripts, spammers and bots; or to prevent worms on instant messaging (IM) . In this article,

3DCAPTCHA
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ABSTRACT This document describes a new type ofCAPTCHAtechnology based on spatial perspective and human imagination. The basic idea is rotation of a special 3D model and finding the correct position of rotation. 3D model can be created from any 2D image. First,

Novelcaptchaschemes
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Abstract ACAPTCHA(Completely Automated Public Turing test to tell Computers and Humans Apart) is a program that can generate and grade tests that most humans are able to solve, yet current computer programs are not. They are used to protect various kinds of

Securing Web Services and Applications usingCaptchaSecurity
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Abstract There are many services in the internet including Email, search engine, social networking are provided with free of cost. To access these web services users have to register regarding the websites. During registration, some intruders or attackers write

A Survey ofCaptchabased Web and Application Security Methods and Techniques
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AbstractCAPTCHAprogram is used to differentiate human from computers and has many applications like online polls, free e-mail services, worm and spam protection, preventing dictionary attack, search engine bots.CAPTCHAensures bots wont enter a website.

A technique for web security using mutual authentication and clicking-cropping based imagecaptchatechnology
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Abstract The major motto of my research is to develop a technique for web security using mutual authentication and clicking and cropping based imageCAPTCHAtechnology. In our technique, we use two sections as registration and login. To create an account to use the

Assessing Threat Posed to VideoCAPTCHAby OCR-Based Attacks
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2.1 Different parameters in video-understanding basedCAPTCHAaffecting the pass rates of humans and the break rates frequency-based attacks. Configurations define the parameters: n=# of related tags in the groundtruth; t= threshold for frequency pruning; s=

R.: Balancing usability and security in a videoCAPTCHA
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Attack Tags Used frequency estimate for each threshold value t. For the control con-t Best Attack Tags# Pruned ˆ Sc (A) 1.0[music, video, live] 0 0.1377 0.01[dj, remix, vs] 37 0.0291 0.009 [girl, school, el] 44 0.0256 0.008 [animation, michael, star] 49 0.0237 0.007 [concert,

CAPTCHAProblems on AI Based For Protection from Automated Hacking Tool
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Abstract- CAPTCHAis program that protects website from web-bots by generating test that computer cannot pass only human can pass. It is completely automated public Turing test to tell the computer and human apart.CAPTCHAis simple puzzle and display the word in

Defeating a simpleCAPTCHAusing Optical Character Recognition
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Abstract I show how to defeat a simpleCAPTCHAusing optical character recognition, a process which involves several different steps. I begin with noise removal, which leaves an image with black characters on a white background. I locate the boundaries of each

Implementation of AdvancedCaptchabased Security System
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Abstract Web sites providing different web services and applications with resources which millions of users need to access. This might lead to unethical use and wastage of resources. To avoid thisCaptchasecurity test which is an image verification test, is being used. Image

Captchaas Graphical Passwordsa New Security Primitive Based on Hard AI Problems
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Abstract: Many security primitives are based on hard mathematical problems. Using hard AI problems for security is emerging as an exciting new paradigm, but has been under explored a novel family of graphical password systems built on top ofCaptchatechnology,

Novel Security Method usingCaptchaas Graphical Password
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ABSTRACT Acaptchais acronym for completely automated public turing tests to tell computers and humans apartCaptchais used for security purpose but there are many attacks which can break captchas. This paper proposes carp ( captchaas graphical

CAPTCHA : A SECURITY MEASURE AGAINST SPAM ATTACKS
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Abstract ACAPTCHAis challenge response test used to ensure that the response is generated by humans.CAPTCHAtest are administrator by machines to differentiate between humans and machine. Because of this reason CAPTCHAs are also known as the

Developing aCAPTCHAUtilizing Cognitive Ability of Human through PHP
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The increased usage of Internet and Network technology has changed the focus in accessing computer environments. Only ten years ago, it was hard to imagine that computers today would be engaged in automated web navigation and requests for contents

Review onCaptcha : Graphical Password for Security
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Abstract--The utilization of passwords is a major point of vulnerability in pc security, as passwords are typically straightforward to guess by machine-driven programs running dictionary attacks. Several security primitives are supported AI mathematical issues. Using

CAPTCHArecognition and robustness measurement using hybrid approaches
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AbstractCompletely Automatic Public Turing test to tell Computers and Humans Apart ( CAPTCHA ) is a HIP (Human interactive Proof) system. CAPTCHAs are used to improve the security of Internet based applications in order to ensure that a web based application which -SOFTWARE SALES SERVICE-https://www.engpaper.net--