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The challenging number is used for the detection of Spoofing attack. The IPSpoofing is considered to be one of the potentially brutal attack which acts asa tool for the DDoS attack which is considered to be a major threat amongsecurity problems in today's internet. These kinds of attack are extremelysevere. They bring down business of company drastically. DDoS attack can easilyexhaust the computing and communication resources of its victim within a shortperiod of time. There are attacks exploiting some vulnerability orimplementation bug in the software implementation of a service to bring thatdown and some attacks will use all the available resources at the targetmachine. This deals on attacks that consume all the bandwidth available to thevictim machine. While concentrating on the bandwidth attack the TCP SYN floodis the more prominent attack. TCP/IP protocol suite is the most widely usedprotocol suite for data communication. The TCP SYN flood works by exhaustingthe TCP connection queue of the host and thus denying legitimate connectionrequest. There are various methods used to detect and prevent this attack, oneof which is to block the packet based on SYN flag count from the same IPaddress. This kind of prevention methods becomes unsuitable when the attackersuse the Spoofed IP address. The SYN spoofing becomes a major tool the TCP SYNflooding. For the prevention of this kind of attacks, the TCP specific probingis used in the proposed scheme where the client is requested challenging numberwhile sending the ACK in the three way hand shake. This is very useful to findthe Spoofed IP Packets/TCP SYN flood and preventing them.

CNoA: Challenging Number Approach for uncovering TCP SYN flooding using SYN spoofing attack