Thesis (M.Sc.)--Chulalongkorn University, 2013

Currently, CAPTCHA (Completely Automated Public Turing test to tell Computer and Human Apart) is used in the daily life before the Internet accessing for preventing automatic programs illegally access web services. CAPTCHA was introduced to identify human or computer program automatically. Many researchers proposed several of CAPTCHA techniques to protect bots, as Text-based CAPTCHA, Audio-based CAPTCHA, Image-based CAPTCHA or Puzzle-based CAPTCHA. Those techniques are able to solve only automatically program but cannot protect system from the 3rd party. This study suggests the combination of biometric of human and CAPTCHA system to protect serious problem. The concept is to prove the uniqueness of human by measuring age, gender, color detection, occupation, timestamp, and correctness of typing. The result leads to the creation of a new way CAPTCHA system that embedded with a suitable bio-detection function to be authenticated as a human user.