As distributed denial-of-servic have caused serious economic and social probl we propose the Service-oriented DDoS Det using a Pseudo State (SDM-P), which runs on defend against DDoS attacks without sacrifici terms of data forwarding. In addition, performance of the SDM-P mechanism performance using a DDoS attack similar occurred in Korea and the USA on July 7th, 20

Abstract. Due to the proliferation of smartphones and wireless internet, the number of DoS/DDoS attacks has increased significantly, and it creates a lot of network traffic. The DoS/DDoS attacks consume the resources of the service server so that the network and the continuity of service cannot be guaranteed [1,2,3]. Current studies on DoS/DDoS focus on a radical change of total traffic or traffic pattern. Results of these type of studies cannot react to ever changing attack patterns and service types [4,5]. This paper proposes a new algorithm to detect DoS/DDoS attacks based on the session information of the service. In this paper, we propose BSDDA(bidirectional session aware DDoS detection algorithm) that detects DoS/DDoS attacks by analyzing the session information that contains service requests as well as service replies. Since the algorithm consideres session information of service requests and responses, its effectiveness is experimentally shown the algorithm effectively responds to the ever changing attack patterns.

For the Personal Cloud Storage, security is an important issue. There is latent threat when it comes to the data loss or leakage which may be committed by malicious Cloud Service Provider (CSP) employee. The most basic solution is to encrypt user's data. However, when the encryption key is directly managed by CSP or user's device, then there is latent threat, too. In this paper, we propose the User-Centric Key ManagementScheme. This scheme enables user to store mandatory key fragment and enables only user to use the encryption key since optional key fragments are stored in a dispersed manner. Meanwhile, even when mandatory key fragment is lost, this prevents leakage of encryption key.

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