i need algorithms used to generate captchas for my presentation (ppt) and (doc) ....etc

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Captchas are tests that distinguish human from software botsin an online environment, used to stop bots abusing services intended for humans. Paypal and Yahoo have captchas in their new user registration process, but there are programs toovercome them. Investigate proposals for new kinds of captchas. Captchas are used to prevent bots from using various types of computing services. Applications include preventing bots from taking part in online polls, registering for free email accounts (which may then be used to send spam), and, more recently, ....etc

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Evaluating Existing Audio CAPTCHAs and an Interface Optimized for Non-Visual Use



INTRODUCTION AND MOTIVATION

The goal of a CAPTCHA1 is to di erentiate humans
from automated agents by requesting the solution to a
problem that is easy for humans but di cult for com-
puters. CAPTCHAs are used to guard access to web re-
sources and, therefore, prevent automated agents

Making CAPTCHAs Accessible

Audio CAPTCHAs were introduced soon after their vi-
sual alternatives , and have be ....etc

[:=Read Full Message Here=:]

Captchas are tests that distinguish human from software botsin an online environment, used to stop bots abusing services intended for humans. Paypal and Yahoo have captchas in their new user registration process, but there are programs toovercome them. Investigate proposals for new kinds of captchas. Captchas are used to prevent bots from using various types of computing services. Applications include preventing bots from taking part in online polls, registering for free email accounts (which may then be used to send spam), and, more recently, ....etc

[:=Read Full Message Here=:]

Incredible update of captcha solving software XEvil 5.0:

Captcha solving of Google (ReCaptcha-2 and ReCaptcha-3), Facebook, BitFinex, Bing, Hotmail, SolveMedia, Yandex,
and more than 12000 another types of captcha,
with highest precision (80..100%) and highest speed (100 img per second).
You can use XEvil 5.0 with any most popular SEO/SMM software: iMacros, XRumer, SERP Parser, GSA SER, RankerX, ZennoPoster, Scrapebox, Senuke, FaucetCollector and more than 100 of other software.

Interested? There are a lot of demo videos about ....etc

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Seminar Report on Audio CAPTCHA: Existing solutions assessment and It s Advancements
What are CAPTCHAs?
Completely Automated Public Test to Tell Computers and Humans Apart.
Web-based protection mechanisms
Only humans allowed to perform certain tasks
Opening E-mail accounts
Voting on-line, etc.
Prevent automated attacks by bots
To avoid eating up resources
To avoid biasing results, etc.
Most current systems - text-based.
Why there came a need for Captchas???
Preventing Comment Spam in Blogs.
Protect ....etc

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Breaking Audio CAPTCHAs



Introduction

CAPTCHAs are automated tests designed to tell computers and humans apart by
presenting users with a problem that humans can solve but current computer programs
cannot. Because CAPTCHAs can distinguish between humans and computers with high
probability, they are used for many different security applications: they prevent bots from
voting continuously in online polls, automatically registering for millions of spam email
accounts, autom ....etc

[:=Read Full Message Here=:]

Captchas are tests that distinguish human from software botsin an online environment, used to stop bots abusing services intended for humans. Paypal and Yahoo have captchas in their new user registration process, but there are programs toovercome them. Investigate proposals for new kinds of captchas. Captchas are used to prevent bots from using various types of computing services. Applications include preventing bots from taking part in online polls, registering for free email accounts (which may then be used to send spam), and, more recently, ....etc

[:=Read Full Message Here=:]

Evaluating Existing Audio CAPTCHAs and an Interface Optimized for Non-Visual Use



INTRODUCTION AND MOTIVATION

The goal of a CAPTCHA1 is to di erentiate humans
from automated agents by requesting the solution to a
problem that is easy for humans but di cult for com-
puters. CAPTCHAs are used to guard access to web re-
sources and, therefore, prevent automated agents

Making CAPTCHAs Accessible

Audio CAPTCHAs were introduced soon after their vi-
sual alternatives , and have be ....etc

[:=Read Full Message Here=:]

CAPTCHA



INTRODUCTION

Overview:
You're trying to sign up for a free email service offered by Gmail or Yahoo. Before you can submit your application, you first have to pass a test. It's not a hard test -- in fact, that's the point. For you, the test should be simple and straightforward. But for a computer, the test should be almost impossible to solve.
This sort of test is a CAPTCHA. They're also known as a type of Human Interaction Proof (HIP). You've probably seen CAPTCHA tests on lots of Web s ....etc

[:=Read Full Message Here=:]

Breaking Audio CAPTCHAs



Introduction

CAPTCHAs are automated tests designed to tell computers and humans apart by
presenting users with a problem that humans can solve but current computer programs
cannot. Because CAPTCHAs can distinguish between humans and computers with high
probability, they are used for many different security applications: they prevent bots from
voting continuously in online polls, automatically registering for millions of spam email
accounts, autom ....etc

[:=Read Full Message Here=:]

CAPTCHA Security: A Low-Cost Attack on a Microsoft CAPTCHA
SEMINAR REPORT
Submitted by
NARAYANAN V
DEPARTMENT OF COMPUTER SCIENCE & ENGINEERING
COLLEGE OF ENGINEERING TRIVANDRUM
2010





ABSTRACT

CAPTCHA is now almost a standard security technology. The most widely used CAPTCHAs rely on the sophisticated distortion of text images rendering them unrecognizable to the state of the art of pattern recognition techniques, and these text-based schemes have found widespread applicati ....etc

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C.A.P.T.C.H.A
Completely Automated Public Turing Test to Tell Computers and Humans Apart

Abstract
A CAPTCHA (an acronym for completely automated public Turing test to tell computers and humans apart, trademarked by Carnegie Mellon University) or a MAPTCHA (Mathematical) is a type of challenge-response test used in computing to determine whether or not the user is human. The term was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper of Carnegie Mellon University, and John Langford of IBM. A common type of CAPTCHA requires t ....etc

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CAPTCHA

CHAPTER 1

INTRODUCTION
1.1 Overview:
You're trying to sign up for a free email service offered by Gmail or Yahoo. Before you can submit your application, you first have to pass a test. It's not a hard test -- in fact, that's the point. For you, the test should be simple and straightforward. But for a computer, the test should be almost impossible to solve. This sort of test is a CAPTCHA. They're also known as a type of Human Interaction Proof (HIP). You've probably seen CAPTCHA tests on lots of Web ....etc

[:=Read Full Message Here=:]

CAPTCHA

CHAPTER 1

INTRODUCTION
1.1 Overview:
You're trying to sign up for a free email service offered by Gmail or Yahoo. Before you can submit your application, you first have to pass a test. It's not a hard test -- in fact, that's the point. For you, the test should be simple and straightforward. But for a computer, the test should be almost impossible to solve. This sort of test is a CAPTCHA. They're also known as a type of Human Interaction Proof (HIP). You've probably seen CAPTCHA tests on lots of Web ....etc

[:=Read Full Message Here=:]