Guarantee Algorithm of Request Success Rate Against Denial of Service Attack in the Security Protocol

In the process of the maintenance of the network security,security protocol must use cryptographic algorithms to achieve the security.In the initial phase of the security protocol,it has to do the complex computation and to store the correlation behavior information.For this reason,security protocol is vulnerable to denial of service attack.This paper analyzes the process about denial of service attack in the security protocol and is concentrated on the way of the puzzle which is to defend the attack.The quantitative study is on the defense process of the puzzle.The adjustment formula about coefficient of difficulty is given,and then the guarantee algorithm of request success rate is able to dynamically adjust the defense intensity.In order to enhance the security of the security protocol and increase the system's operating efficiency.