DDOS Attack Detection and Mitigation Technique Based On Http Count and Verification Using CAPTCHA

With the rapid development of internet, the number of people who are online also increases tremendously. But now a day's we find not only growing positive use of internet but also the negative use of it. The misuse and abuse of internet is growing at an alarming rate. There are large cases of virus and worms infecting our systems having the software vulnerability. These systems can even become the clients for the bot herders. These infected system aid in launching the DDoS attack to a target server. In this paper we introduced the concept of IP blacklisting which will blocked the entire blacklisted IP address; http count filter will enable us to detect the normal and the suspected IP addresses and the CAPTCHA technique to counter check whether these suspected IP address are in control by human or botnet.