Detecting human attacks on text‐based CAPTCHAs using the keystroke dynamic approach

A Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA) is a simple test that used on websites differentiate between human users automated attacks indulge in spamming other fraudulent activities. text-based CAPTCHA the most popular security technique by many Internet, such as Microsoft, Google eBay, secure their sites from attacks. By design, however, unable legitimate user human-based attacker. This may make vulnerable while using CAPTCHAs. Hence this article proposes novel defence system keystroke dynamic approach. To evaluate our system, laboratory experiment was conducted results showed proposed able detect CAPTCHAs effectively with 100% detection rate.