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Jan 3, 2011

What is CAPTCHA and How it Works?

CAPTCHA or Captcha (pronounced as cap-ch-uh) which stands for “Completely Automated Public Turing test to tell Computers and Humans Apart” is a type of challenge-response test to ensure that the response is only generated by humans and not by a computer. In simple words, CAPTCHA is the word verification test that you will come across the end of a sign-up form while signing up for Gmail or Yahoo account. The following image shows the typical samples of CAPTCHA.
Almost every Internet user will have an experience of CAPTCHA in their daily Internet usage, but only a few are aware of what it is and why they are used. So in this post you will find a detailed information on how CAPTCHA works and why they are used.

What Purpose does CAPTCHA Exactly Serve?

CAPTCPA is mainly used to prevent automated software (bots) from performing actions on behalf of actual humans. For example while signing up for a new email account, you will come across a CAPTCHA at the end of the sign-up form so as to ensure that the form is filled out only by a legitimate human and not by any of the automated software or a computer bot. The main goal of CAPTCHA is to put forth a test which is simple and straight forward for any human to answer but for a computer, it is almost impossible to solve.

What is the Need to Create a Test that Can Tell Computers and Humans Apart?

For many the CAPTCHA may seem to be silly and annoying, but in fact it has the ability to protect systems from malicious attacks where people try to game the system. Attackers can make use of automated softwares to generate a huge quantity of requests thereby causing a high load on the target server which would degrade the quality of service of a given system, whether due to abuse or resource expenditure. This can affect millions of legitimate users and their requests. CAPTCHAs can be deployed to protect systems that are vulnerable to email spam, such as the services from Gmail, Yahoo and Hotmail.

Who Uses CAPTCHA?

CAPTCHAs are mainly used by websites that offer services like online polls and registration forms. For example, Web-based email services like Gmail, Yahoo and Hotmail offer free email accounts for their users. However upon each sign-up process, CAPTCHAs are used to prevent spammers from using a bot to generate hundreds of spam mail accounts.

Designing a CAPTCHA System

CAPTCHAs are designed on the fact that computers lack the ability that human beings have when it comes to processing visual data. It is more easily possible for humans to look at an image and pick out the patterns than a computer. This is because computers lack the real intelligence that humans have by default. CAPTCHAs are implemented by presenting users with an image which contains distorted or randomly stretched characters which only humans should be able to identify. Sometimes characters are striked out or presented with a noisy background to make it even more harder for computers to figure out the patterns.
Most, but not all, CAPTCHAs rely on a visual test. Some Websites implement a totally different CAPTCHA system to tell humans and computers apart. For example, a user is presented with 4 images in which 3 contains picture of animals and one contain a flower. The user is asked to select only those images which contain animals in them. This Turing test can easily be solved by any human, but almost impossible for a computer. 

Breaking the CAPTCHA

The challenge in breaking the CAPTCHA lies in real hard task of teaching a computer how to process information in a way similar to how humans think. Algorithms with artificial intelligence (AI) will have to be designed in order to make the computer think like humans when it comes to recognizing the patterns in images. However there is no universal algorithm that could pass through and break any CAPTCHA system and hence each CAPTCHA algorithm must have to be tackled individually. It might not work 100 percent of the time, but it can work often enough to be worthwhile to spammers.

Jan 1, 2011

Hack Facebook Password

 
 
Why SniperSpy is the best?
Today there exists hundreds of keyloggers on the market but most of them are no more than a crap. However there are only a few that stand out of the crowd and SniperSpy is the best among them. I personally like SniperSpy for it’s REMOTE INSTALLATION FEATURE. With this you can install it on a remote computer without the need for having physical access to it. It operates in complete stealth mode so that it remains undetected.
 
Here is a summary of benefits that you will receive with Sniperspy software:
 
1. Access ANY Password
With SniperSpy you can hack any password and gain access to Facebook or any other online account.
 
2. Monitor Every Activity
You can monitor every activity of the target computer, take screenshots and record chats & IM conversations.
 
3. Never Get Caught
SniperSpy operates in total stealth mode and thus remains undetectable. Thus you need not have the fear of being traced or get caught.
 
4. Remote Installation Feature
With Remote Install feature, it is possible to install it even on computers for which you do not have physical access. However it can also be installed on a local computer.
 
5. Extremely Easy to Use
Installing and using SniperSpy is simple and needs no extra skill to manage.
 
6. Completely Safe to Use
This software is 100% safe to use since it doesn’t collect any information from your computer. SniperSpy is a reputed, trustworthy and reliable company which offers 100% privacy for it’s users.
 
7. Works on both Windows and Mac
Fully compatible with Windows 2000/XP/Vista/7 and Mac.
 
So what are you waiting for? If you are really serious to hack Facebook password then SniperSpy is for you. Go grab it now and expose the truth!
 
 
 
 

2. Other Ways to Hack Facebook Password

 
The other common way to hack passwords or online accounts is Phishing. This is the most widely used technique by many hackers to gain access to Facebook and other social networking sites. This method will make use of a fake login page (often called as spoofeed webpage) which exactly resemble the original one. Say for example a spoofed webpage of Facebook looks exactly same as that of the original page. This page is actually created by the hacker and is hosted on his own server. Once an innocent victim enters his/her password in such a fake login page, the login details are stolen away by the hacker.
Most Internet users would easily fall prey to online phishing scams. Thus phishing scams trick users so that they themselves give away their passwords. However phishing requires specialized knowledge and high level skills to implement. Thus it would not be possible for a noob user to attempt this trick. It is punishable offense too. So I would recommend the use of keyloggers to hack Facebook since it is the easiest and safest way.

Happy New Year

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