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 widespr ....etc

[:=Read Full Message Here=:]

Seminar Report onAudio 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. 
Protec ....etc

[:=Read Full Message Here=:]

audio captcha seminar report documentation

Thanks & Regards.
Rajendar.B ....etc

[:=Read Full Message Here=:]

i want ieee paper of audio captcha existing solutions assessment and a new implementation for voip telephony ....etc

[:=Read Full Message Here=:]

i want audio captcha existing solution assesment and implementation over voip telephony synopsis and seminar report ....etc

[:=Read Full Message Here=:]

Hi,
I am Anusha Sekar. I am in my final year of Computer Science Engineering.
I want to know if you have ppt presentation fro the topic- 3D CAPTCHA: A Next Generation of the CAPTCHA. Could you help me out with the presentation? If you already have the presentation, please mail me at [email protected].

Thank You ....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 dierentiate humans
from automated agents by requesting the solution to a
problem that is easy for humans but dicult 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 alterna ....etc

[:=Read Full Message Here=:]

An Alternative To Captcha - Video Captcha
B.Tech Seminar report
by
Nawas Abdulla
Department of Computer Science And Engineering
Government Engineering College, Thrissur
December 2010

report:


Abstract
Video Captcha is a new technique for using content based video as a CAPTCHA
task. These CAPTCHAs are presently generated from YouTube videos, which con-
tains tags supplied by the person while uploading that video. These videos are graded
using the given video ....etc

[:=Read Full Message Here=:]

IP Telephony (VoIP)
Introduction (1)
• Challenge
– Voice transmission delay
– Call setup: call establishment, call termination, etc.
– Backward compatibility with existing PSTN (Public Switched Telephone Network)
– IP Telephony Standards:
– ITU (International Telecommunication Union) controls telephony standards.
– IETF (Internet Engineering Task Force) controls TCP/IP standards.
Encoding, Transmission, & Playback (1)
• UDP is used for transport because
– lower overhead: audio must ....etc

[:=Read Full Message Here=:]

Telephony: history and evolution
IP Telephony: What, Why & Where?
q Adding interactive multimedia to the web
q Being able to do telephony on IP with a variety of devices
q Consumer & business markets
q Key element of convergence in carrier infrastructure
Basic IP telephony model
q Protocols: SIP, H.323, RTP, Coding schemes, Megaco
q Future: Invisible IP telephony and control of appliances
What is VoIP?
Why VoIP?
Where is VoIP Today?
What is VoIP?
q Telephony over IP standards bodies
q I ....etc

[:=Read Full Message Here=:]