TERM PAPER REPORT

ON

CAPTCHA

Submitted by:

SONAL CHANDRA

AUR1123006

B.TECH ( IT )

III Semester

Under the Guidance of

Mr. Deepak Panwar

Amity School of Engineering & Technology

AMITY UNIVERSITY RAJASTHAN

CERTIFICATE

This is to certify that SONAL CHANDRA student of B. Tech. in Information

Technology has carried out the work presented in the project of the term paper

entitled “CAPTCHA” as a part of Second Year programme of Bachelor of

Technology in of B. Tech. in Information Technology from Amity School of

Engineering and Technology, Amity University Rajasthan, under my supervision.

Date: Mr. Deepak Panwar

Faculty Guide

ASET, AUR

ACKNOWLEDGEMENT

It has come out to be a sort of great pleasure and experience for me to work on the

project “CAPTCHA”. I wish to express my indebtedness to those who helped us

i.e. the faculty of our Institute Mr. Deepak Panwar during the preparation of the

manual script of this text. This would not have been made successful without his

help and precious suggestions. Finally, I also warmly thanks to all our colleagues

who encouraged us to an extent, which made the project successful.

Sonal Chandra

Contents

Abstract……………………………………………………..……………………….…...…......……….i

List of Figures………………………………...………………….………………………....…...........ii

1 Introduction…………………...…………………….…………...…………………...............1

1.1 Conceptualization…………………………………………………………………….…...2

1.1 Image Recognition Captchas ………………………………………………………….….3

1.1 reCAPTCHA ……………………………………………………………………….…….5

1.1 Captchas And The Turing Test ……………………………………………………….….8

1.1 CAPTCHA and Artificial Intelligence …………………………………………………10

2 Creating A Captcha……………………………….…………………….…………..........13

2.1 Algorithm To Create CAPTCHA ………………………………………………...…....15

3 Working Of Captcha……………………………………….…………...…….………....22

4 Breaking A Captcha……………………………………………....……………...............23

4.1 Electronic Ears ………………………………………...………..…...………………….24

4.2 Breaking a Visual CAPTCHA ………………………………………...………..…...….26

5 Asirra…………..…..…..……………………………………………………………………...35

6 The Hacking Of Yahoo Captcha.…………………...…………....………………….38

7 Applications Of CAPTCHA…………...……….….......…..........................................40

7.1 The Future of CAPTCHA ……………………………………………………..………..42

11 Conclusion……………………………………...……………………………….……...… …81

12 References………………………………………….………...………………...….................45