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Many network security applications in today's networks a0re based on deep packet inspection, checking not only the header portion but also the payload portion of a packet. For example, traffic monitoring, layer-7 filtering, and network intrusion detection all require an accurate analysis of packet content in search for predefined patterns to identify specific classes of applications, viruses, attack...
In this paper, we design and implement an advanced FPGA (Field-Programmable Gate Array)-based sensor gateway for wireless multimedia sensor networks. We propose a gateway architecture termed “Heterogeneous Gateway”, which provides multiple interfaces to PSTN, GSM, CDMA, Internet, and so on, for supporting various application scenarios. Meanwhile, the gateway accesses to PSTN (Public Switched Telephone...
Ternary Content Addressable Memories (CAMs) are widely used by high-speed routers to find matching routes in a routing table, because they enable the longest prefix matching operation to complete in a single clock cycle. However, they are costly and their power consumption is very high and some solutions have been proposed. But some issues have not been well studied: first, the memory accesses often...
Wireless Audio Sensor Networks (WASNs) can provide event detection, object tracking and emergency response through cooperative audio sensor nodes. Effective collaboration of audio sensors requires precise synchronization among audio streams. Some researches have been done on the timestamp mechanism based on time synchronization ignoring propagation delay and many other researches have focused on the...
Ternary Content Addressable Memories (CAMs) are widely used in high-speed routers. They allow a longest-prefix matching operation to complete within a single clock cycle. However, TCAMs are costly and their power consumption is very high. In this paper, we identify two kinds of redundancy in the usage of TCAMs in IP route lookup, and propose a hybrid scheme which combines Binary CAMs and Ternary CAMs...
There have been many time synchronization protocols proposed for sensor networks. However, the security problems related to time synchronization have not been fully solved yet. If malicious entities manipulate time synchronization, failures of many functionalities in the sensor networks would occur. In this paper, we identify various attacks against time synchronization and then develop a detection...
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