This document presents a project on a novel graphical password system called Captcha as Graphical Passwords (CaRP) that uses CAPTCHA technology. CaRP addresses security issues like online guessing attacks, relay attacks, and shoulder surfing. It offers protection against dictionary attacks and relay attacks while being reasonably secure and usable. The document describes the existing CAPTCHA system, disadvantages of the current approach, the proposed CaRP system and its advantages, software and hardware requirements, UML diagrams, sample registration and login pages, and test cases.

1. Under The Guidance Of
SK.Shaheena Begum (Asst.Professor)
Project On
Presented By
VISVODAYA ENGINNERING COLLEGE
M.Vishanu Vardhan

2. INTRODUCTION
 In this project, we present a new security
primitive based on hard AI problems, namely, a
novel family of graphical password systems built
on top of Captcha technology, which we call
Captcha as graphical passwords (CaRP).
 CaRP is not a panacea, but it offers reasonable
security and usability and appears to fit well with
some practical applications for improving online
security.

3. EXISTING SYSTEM
 The most notable primitive invented is
Captcha, which distinguishes human users
from computers by presenting a challenge, i.e.,
a puzzle, beyond the capability of computers
but easy for humans.
 Captcha is now a standard Internet security
technique to protect online email and other
services from being abused by bots.

4. DISADVANTAGES OF EXISTING
SYSTEM
 This existing paradigm has achieved just a
limited success as compared with the
cryptographic primitives based on hard math
problems and their wide applications.

5. PROPOSED SYSTEM
 CaRP is both a Captcha and a graphical password
scheme.
 CaRP addresses a number of security problems
altogether, such as online guessing attacks, relay
attacks, and, if combined with dual-view
technologies, shoulder-surfing attacks.

6. ADVANTAGES OF PROPOSED SYSTEM
 CaRP offers protection against online dictionary
attacks on passwords, which have been for long
time a major security threat for various online
services.
 CaRP also offers protection against relay attacks,
an increasing threat to bypass Captchas
protection.

7. SOFTWARE REQUIREMENTS
Operating system : Windows 7
Coding Language : C#.Net
Server side scripting: ASP.Net
IDE : Visual Studio 2010
Database : SQL SERVER 2008

8. HARDWARE REQUIREMENTS
System : Pentium IV 2.4 GHz.
Hard Disk : 40 GB.
RAM : 512 MB.

9. UML DIAGRAMS
Use Case Diagram:

10. CLASS DIAGRAM

11. SEQUENCE DIAGRAM
ADMIN
Database
USER
REGISTRATION
SELECT THE CAPTCHA IMAGE
UPLOAD PROFILE PHOTO
LOGIN
UPDATE PROFILE
UPLOAD FILE
VIEW FILES
VIEW USER DETAILS
MONITOR THE USER ACTIVITIES

12. Registration page:

13. Captcha:

18. Test case id Test case scenario Test result
1 Check whether all
fields are filled or
not
Fields are filled
2 Check whether the
captcha is selected
or not
Captcha is selected
Test cases for registration:

19. Test case id Test case scenario Test result
1 Check whether the
username and
password are valid
The username and
password are valid
2 Check whether the
selected captcha is
valid or not.
The selected captcha
is valid
Test cases for login:

20. Conclusion:
 It is an alternative to textual alphanumeric password.
It is easy to remember and hard to guess
In addition to offering protection from online guessing
attacks,CaRP is also resistant to captcha relay attacks.

21. Thank you!!!