(57) ABSTRACT A method and a system generate a contextual visual challenge image to be
presented to a user thereby to verify that the user is human. For example, an image module …

A CAPTCHA is a variation of the Turing test, in which a challenge is used to distinguish
humans from computers (" bots") on the internet. They are commonly used to prevent the …

This document discusses, among other things, a system and method for detecting an
initiation of a transaction and generating a string of characters based on the detection. A first …

Related US Application Data Woessner, PA (63) Continuation of application No. 10/186,637,
filed on (57) ABSTRACT Jun. 28, 2002. A system is provided to monitor a user's interaction …

(57) ABSTRACT A system is provided to monitor a user's interaction with a computer. The
system may comprise a random reference data generator to generate a random reference …

Abstract CAPTCHA (Completely Automatic Public Turing to tell Computers and Human
Apart) has been developed to defend e-commerce systems from the attack of automatic …

1 Summary Human Interactive Proofs (HIPs) are a class of automated challenges used to
differentiate between legitimate human users and automated, malicious robots on the …

A system and method for providing key challenge validation is provided. In example
embodiments, an initiation of a transaction is detected and a challenge comprising a string …

This document discusses, among other things, a system and method for detecting an
initiation of a transaction and generating a string of characters based on the detection. A …

Abstract Human Interactive Proof (HIP) systems have been introduced to distinguish
between various groups of users. CAPTCHA methods are one of the important branches of …