39 lines
1.5 KiB
TeX
39 lines
1.5 KiB
TeX
\subsection{CAPTCHA rating parameters}
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CAPTCHA systems use a variety of methods in their decision process. Every method
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has its own strengths and limitations, but the following parameters have been
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chosen to uniformly rate CAPTCHA methods and systems in an attempt to compare
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them.
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\begin{description}[\IEEEsetlabelwidth{Effectiveness}]
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\item[Privacy]
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\begin{itemize}
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\item Does the method use trackers or any other identifying method?
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\item Does the method work in anonymous networks like TOR?\
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\end{itemize}
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\item[Effectiveness]
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\begin{itemize}
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\item Is the method/system effective in containing DoS attacks?
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\item Can the method be circumvented? If yes, how practical or feasible
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is the attack? If the method has feasible or practical
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circumventions, it is immediately marked `bad' for effectiveness.
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\end{itemize}
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\item[Accessibility]
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\begin{itemize}
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\item Is the method posing any challenges to visually to users
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with auditory, cognitive and visual disabilities?
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\item How easy is it to use?
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\item Does the method have a language dependency which poses a challenge to
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non-English speakers?
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\end{itemize}
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If a method is impossible to use for any group of users, some of which are
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mentioned above,
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\item[Accuracy]
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\begin{itemize}
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\item How accurate is the method in detecting potentially malicious
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users?
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\item Are there any factors that method's impact accuracy?
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\end{itemize}
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Bad accuracy when circumventions are used results downgrades `good' to `bad'
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rating.
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\end{description}
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