Automatic Generation of Game-based CAPTCHAs
نویسندگان
چکیده
A Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA) is a challenge-response test used on the Internet to prevent bots from accessing web services that are designed for humans. In this paper, we propose Automatic Game-based CAPTCHA Generation (AGCG), in which an AI system generates games that, when played, distinguish between humans and bots. The gamebased CAPTCHA takes advantage of not only the bots’ difficulty in performing pattern/object recognition, but also their lack of commonsense knowledge. Thus it is more secure but remains easy and fun for humans, compared to traditional visual based CAPTCHAs. Furthermore, our AGCG system is capable of learning new commonsense knowledge based on users’ response in the game-based CAPTCHAs.
منابع مشابه
Dynamic Cognitive Game CAPTCHA Usability and Detection of Streaming-Based Farming
CAPTCHAs are a widely deployed mechanism to distinguish a legitimate human user from a computerized program trying to abuse online services. Attackers, however, have devised a clever and an economical way to bypass the security provided by CAPTCHAs by simply relaying CAPTCHA challenges to remote human-solvers. Most existing varieties of CAPTCHAs are completely vulnerable to such relay attacks, ...
متن کاملGeneration and Performance Evaluation of Synthetic Handwritten CAPTCHAs
In this paper we explore the potential of handwriting for use in CAPTCHAs. A synthetic handwriting generation method is presented, where the generated textlines need to be as close as possible to human handwriting without being writer-specific. The primary application of such a synthetic generator is in the design of handwritten CAPTCHAs (Completely Automatic Public Turing Test to Tell Computer...
متن کاملThree-Way Dissection of a Game-CAPTCHA: Automated Attacks, Relay Attacks, and Usability
Existing captcha solutions on the Internet are a major source of user frustration. Game captchas are an interesting and, to date, little-studied approach claiming to make captcha solving a fun activity for the users. One broad form of such captchas – called Dynamic Cognitive Game (DCG) captchas – challenge the user to perform a game-like cognitive task interacting with a series of dynamic image...
متن کاملCaptchas With a Purpose
In this paper, we develop some new Captchas belonging to genre — “CAPTCHAs with a purpose.” These CAPTCHAs apart from having its applications serve some useful purpose. reCAPTCHA is one such Captcha developed at Carnegie Mellon University. It helps to digitize books. Another such Captcha is Asirra developed at Microsoft which provides homes for homeless animals. In this paper, we present Time b...
متن کاملSolving Avatar Captchas Automatically
Captchas are challenge-response tests used in many online systems to prevent attacks by automated bots. Avatar Captchas are a recently-proposed variant in which users are asked to classify between human faces and computergenerated avatar faces, and have been shown to be secure if bots employ random guessing. We test a variety of modern object recognition and machine learning approaches on the p...
متن کامل