Improving Audio CAPTCHAs
نویسندگان
چکیده
CAPTCHAs are computer generated tests that humans can pass but current computer systems cannot. CAPTCHAs provide a method for automatically distinguishing a human from a computer program, and therefore can protect web services from bots. Most CAPTCHAs consist of distorted images, usually text, for which a user must provide some description. Unfortunately, visual CAPTCHAs limit access to the millions of visually impaired people using the web. Audio CAPTCHAs were created to solve this accessibility issue; however, the security of audio CAPTCHAs was never formally tested. We analyze the security of current audio CAPTCHAs, and provide a description and analysis of a new and improved audio CAPTCHA.
منابع مشابه
Breaking Audio CAPTCHAs
CAPTCHAs are computer-generated tests that humans can pass but current computer systems cannot. CAPTCHAs provide a method for automatically distinguishing a human from a computer program, and therefore can protect Web services from abuse by so-called “bots.” Most CAPTCHAs consist of distorted images, usually text, for which a user must provide some description. Unfortunately, visual CAPTCHAs li...
متن کاملDecaptcha: Breaking 75% of eBay Audio CAPTCHAs
CAPTCHA tests aim at preventing attackers from performing automatic website registration. In this paper we show that our prototype Decaptcha is able to successfully break 75% of eBay audio captchas. We compare its performance with the state of the art, readily available speech recognition system Sphinx and discuss the implications for eBay security.
متن کاملHIPUU: a Universally Usable Approach to Defeating Automated Bots
There is clearly a need on the web for security features to stop spam and bots. However, many security features on web sites are not accessible for people with disabilities. A common form of security on web sites is a human interaction proof. HIPs are used to differentiate between humans and automated bots. The most common form of HIP is known as a CAPTCHA (Completely Automated Public Turing te...
متن کاملProtection through Intelligent and Multimedia Captchas
The Complete Automatic Public Turing test to tell Computers and Humans Apart (CAPTCHA) is a modern implementation of the Turing test. A CAPTCHA asks a series of questions which are supposed to be relatively easy for mature human beings but hard for machines to answer. A CAPTCHA, as its name suggests, is generally used as a tool to distinguish human beings from machines when the corresponding pa...
متن کاملDevacaptcha - a Framework to Prevent Bot Attacks
Human Interactive Proofs (HIPs) are automatic reverse Turing tests designed to distinguish between various groups of users. Completely Automatic Public Turing test to tell Computers and Humans Apart (CAPTCHA) is a HIP system that distinguish between humans and malicious computer programs. Many CAPTCHAs have been proposed in the literature that text-graphical based, audio-based, puzzle-based and...
متن کامل