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Captcha by vinit sharma
1.
CAPTCHA IMAGINATION:
A Robust Image Based CAPTCHA Generation System
2.
3.
Full Form
4.
Definition
5.
Example
6.
Applications
7.
Types of CAPTCHA
8.
Advantages
9.
Disadvantages
10.
11.
12.
The process usually
involves one computer asking a user to complete a simple test which the computer is able to generate and grade.
13.
14.
15.
Online Polls.
16.
Search Engine Bots.
17.
18.
Graphic Based CAPTCHA.
19.
20.
Used in Yahoo
Messenger Service.
21.
It contains only
one random character string.
22.
23.
Uses 8 characters.
24.
Wraping is used
to distort.
25.
26.
27.
User must find
the characteristic that sets the two series apart
28.
29.
30.
User listens
and enters the spoken word.
31.
Helps visually disabled
users.
32.
33.
It avoids accessing
of E-mails by thousands of spammers every day.
34.
Fits to theme
of the page.
35.
36.
Some CAPTCHA images
are very difficult to interpret for humans also.
37.
38.
Applications are varied–
from stopping bots to character recognition & pattern matching.
39.
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