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CAPTCHAs, also known as reverse Turing tests are real-time assessments that are commonly used by programs to tell humans and machines apart. This can be achieved by assigning and assessing or evaluating hard AI problems such that these problems could only be solved easily by human but not by machines. A new security approach based on hard AI problems and Captcha technology is known as Captcha as gRaphical...
CAPTCHA, especially Text-based CAPTCHA, is the most widely used for security over the online environment in the present. That was used for identification automatic program computer and real human users. This technology was introduced by IBM that is a very high-end company in a very high-end country when comparing with countries in this study. This research was performed using a questionnaire to samples...
CAPTCHA is an acronym of the Completely Automated Public Turing test to tell Computers and Humans Apart. CAPTCHA is a technique of testing for ensures that only those people just passing the test and not the system computer generated (bots). The development of CAPTCHA system is to providing creative and validation tests can be easily solved by humans and difficult for bots. There are four types of...
In recent times, cyber-attacks and cyber warfare have threatened network infrastructures from across the globe. The world has reacted by increasing security measures through the use of stronger passwords, strict access control lists, and new authentication means; however, while these measures are designed to improve security and Information Assurance (IA), they may create accessibility challenges...
In order to better ensure the Web security, we designed a CAPTCHA mechanism. It took the RIA areas flexibility combined with interaction design field and used to CAPTCHA design field. This kind of mechanism improves the safety of the CAPTCHA from four aspects. First, we used interactions of man - machines; Second, by comparing the server-side SessionID, random ID and flag variable, it prevents malicious...
A CAPTCHA is a technique that is used to prevent automated programs from being able to acquire free e-mail or online service accounts. However, as many researchers have already reported, conventional CAPTCHAs could be overcome by state-of-the-art malwares since the capabilities of computers are approaching those of humans. Therefore, CAPTCHAs should be based on even more advanced human-cognitive-processing...
The main weakness of passwords is that it is vulnerable to dictionary attacks implemented by automated programs. As the EKE protocol could resist the offline dictionary attack and the CAPTCHA could avoid automatic on-line dictionary attack implemented by the attacker, in this paper, based on the two protocols, we proposed the hybrid password authentication protocols. Our new password authentication...
CAPTCHA is a technique that is used to prevent automatic programs from being able to acquire free e-mail or online service accounts. However, as many researchers have already reported, conventional CAPTCHA could be overcome by state-of-the-art malware since the capabilities of computers are approaching those of humans. Therefore, CAPTCHA should be based on even more advanced human-cognitive-processing...
Text-based password schemes have inherent security and usability problems, leading to the development of graphical password schemes. However, most of these alternate schemes are vulnerable to spyware attacks. We propose a new scheme, using CAPTCHA (Completely Automated Public Turing tests to tell Computers and Humans Apart) that retaining the advantages of graphical password schemes, while simultaneously...
CAPTCHAs are challenges or tests administered automatically over networks that can distinguish between people and machines (automated script) and thus protect web services from abuse by programs disguising as human users. Most existing CAPTCHA challenges are a single challenge response system (CR) that provide ready-made answers to the users in which case a bot may answer the test and escape scot-free...
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