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Stanislawa Staszica","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100007751","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["EURASIP J. on Info. Security"],"abstract":"<jats:title>Abstract<\/jats:title><jats:p>CAPTCHA (<jats:italic>Completely Automated Public Turing test to tell Computers and Humans Apart<\/jats:italic>) has long been used to keep automated bots from misusing web services by leveraging human-artificial intelligence (HAI) interactions to distinguish whether the user is a human or a computer program. Various CAPTCHA schemes have been proposed over the years, principally to increase usability and security against emerging bots and hackers performing malicious operations. However, automated attacks have effectively cracked all common conventional schemes, and the majority of present CAPTCHA methods are also vulnerable to human-assisted relay attacks. Invisible reCAPTCHA and some approaches have not yet been cracked. However, with the introduction of fourth-generation bots accurately mimicking human behavior, a secure CAPTCHA would be hardly designed without additional special devices. Almost all cognitive-based CAPTCHAs with sensor support have not yet been compromised by automated attacks. However, they are still compromised to human-assisted relay attacks due to having a limited number of challenges and can be only solved using trusted devices. Obviously, cognitive-based CAPTCHA schemes have an advantage over other schemes in the race against security attacks. In this study, as a strong starting point for creating future secure and usable CAPTCHA schemes, we have offered an overview analysis of HAI between computer users and computers under the security aspects of open problems, difficulties, and opportunities of current CAPTCHA schemes.<\/jats:p>","DOI":"10.1186\/s13635-022-00134-9","type":"journal-article","created":{"date-parts":[[2022,12,12]],"date-time":"2022-12-12T15:03:19Z","timestamp":1670857399000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Human-artificial intelligence approaches for secure analysis in CAPTCHA codes"],"prefix":"10.1186","volume":"2022","author":[{"given":"Nghia","family":"Dinh","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lidia","family":"Ogiela","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,12,12]]},"reference":[{"key":"134_CR1","volume-title":"CAPTCHA: using hard AI problems for security","author":"L von Ahn","year":"2003","unstructured":"L. von Ahn, M. 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