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The traditional time synchronization algorithms based on the Network Time Protocol (NTP) obtain accurate time synchronization on the assumption that the round-trip delay is equal. A highly precise time synchronization method is preposed, which process the one-way delay in dynamic network. The implementation in the substation automation system(SAS) shows that the algorithm reduces network jitter, as...
Key agreement protocols are essential for secure communications in open and distributed environment. The study of tripartite key agreement has great theoretical and practical significance. Shim and Woo pointed out that the four tripartite authenticated key agreement protocols proposed by Al-Riyami and Paterson were insecure. Modifying the communication messages, an active adversary is able to calculate...
Research on coverage of wireless sensor networks are mostly aiming at isomorphic nodes, however, which gives little attention on heterogeneous nodes. There haven't been effective solutions up to now. Adopting Probability Coverage Model is more efficient relatively, which can obtain more accurate data. By means of computing the coverage probability of each node, we infer the coverage probability of...
Time synchronization is one of core technologies in distributed systems and communication fields. The "Network Time Protocol" (NTP) is the current widely accepted standard for synchronizing clocks over the Internet. NTP uses a hierarchical scheme in order to synchronize the clocks in the network. It mainly adopts a phase-locked loop technique to adjust the local clock. This paper develops...
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