An examination of the interactive video CAPTCHA method to resist relay attack

Ryohei Tatsuda, Kentaro Aburada, Hisaaki Yamaba, Tetsuro Katayama, Masayuki Mukunoki, Mirang Park, Naonobu Okazaki
2018 IEICE Communications Express  
CAPTCHA is a kind of challenge response test, which is used to distinguish human users from malicious computer program such as bots. However, the attack technique called relay attack as a method to avoid the CAPTCHA has been devised. This attack relays the CAPTCHA challenges to remote human-solvers, let them to decode CAPTCHA challenges. We used delay time that is caused by communications needed in relay attack. Our new CAPTCHA uses this delay time between communications to prevent relay
more » ... . We constructed an experimental environment in which relay attack can be simulated, made a series of experiments in order to evaluate the performance of the proposed method.
doi:10.1587/comex.2017xbl0192 fatcat:2rkbtmcl3neppnkqa3f3m2yn3a