September 2018
Intermediate to advanced
250 pages
8h 22m
English
CAPTCHA (and their successor, reCAPTCHAs) are Google-administered Turing tests designed to block bot form submission spam by asking a bot to do things (sophisticated natural language detection, image pattern recognition, performing tasks on dynamic challenges, and so on) that your average bot can't do. Because they represent a third-party service whose security posture is managed by an outside company, most companies that host CAPTCHAs themselves won't reward any CAPTCHA-related bugs or vulnerabilities.
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