Abstract
This chapter introduces a categorization of the main types of CAPTCHA. Then, each category of CAPTCHA is described and some examples are shown. The main advantages and problems related to the different categories of CAPTCHA are shortly discussed. This represents an introductive overview preceding the subsequent chapters where some types of CAPTCHA belonging to this categorization are described in more detail.
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Brodić, D., Amelio, A. (2020). Types of CAPTCHA. In: The CAPTCHA: Perspectives and Challenges. Smart Innovation, Systems and Technologies, vol 162. Springer, Cham. https://doi.org/10.1007/978-3-030-29345-1_6
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DOI: https://doi.org/10.1007/978-3-030-29345-1_6
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