Research
Priority based Congestion Control Mechanism in Multipath Wireless Sensor Network
Wireless Sensor Network (WSN) is a network composed of distributed autonomous devices using sensors. Sensor nodes send their collected data to a determined node called Sink. The sink processes data and performs appropriate actions. Nodes using routing protocol determine a path for sending data to sink. Congestion occurs when too many sources are sending too much of data for network to handle. Congestion in a wireless sensor network can cause missing packets, long delay, overall channel quality to degrade, leads to buffer drops. Congestion control mechanism has three phases, namely congestion detection, congestion notification and congestion control. In this paper is propose two bit binary notification flag to notify the congested network status for implicit congestion detection. For congested network status, we propose a priority based rate adjustment technique for controlling congestion in link level. Congested packet will be distributed equally to the child node to avoid packet loss and transition delays based on technique. Furthermore, this technique allocates the priority of many applications simultaneously running on the sensor nodes, which route is own data as well as the data generated from other sensor nodes. The results show that the proposed technique achieves better normalized throughput and total scheduling rate with the avoiding packet loss and delay.
Security of Side Channel Power Analysis Attack in Cloud Computing
Future world is moving towards cloud computing. In a word cloud computing can be defined as remote access computing resources through the Internet. It provides a lot of services at a very low cost. It can improve an organization’s performance by minimizing its cost. It also helps to maximize their revenue with fewer resources. It is becoming popular among organizations and people. They can store their data in cloud at low cost. Attackers aim to attack cloud environment for getting valuable information from cloud users. They attack on it by taking different approaches. They try to access confidential information of different organizations from the cloud. Among different attacks side channel power analysis attack is a newer type of attack. In this paper, we proposed a way to mitigate these types of attacks through a Police Virtual Machine (Police VM). The Police VM provides false power consumption information to attackers and they cannot get real power consumption information from user VM.
