驗證碼(CAPTCHA,completely automated public Turing test to tell computers and humans apart)是一種有效防止機器人及惡意使用者濫用網站或服務的驗證措施,大多數情況下驗證碼是一串扭曲和帶有雜訊的字元。作為一種反向圖靈測試(被用來區分人類和機器的測試),驗證碼可以有效地攔截惡意程式,人工智慧初創企業 Vicarious 宣稱他們的程式可透過模擬人腦處理視覺資訊的方式破解數種驗證碼,成功率可達九成以上。
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