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Reputation systems are having increasing influence on guarding P2P networks. However, reputation systems themselves are vulnerable to attack. Due to the nature of aggregating ratings, the reputation scores of certain peers can be manipulated intentionally by adversaries. In this paper, we report the discovery of a novel attack, named RepHi (Reputation(More)
Forest aboveground biomass (AGB) was mapped throughout China using large footprint LiDAR waveform data from the Geoscience Laser Altimeter System (GLAS) onboard NASA's Ice, Cloud, and land Elevation Satellite (ICESat), Moderate Resolution Imaging Spectro-radiometer (MODIS) imagery and forest inventory data. The entire land of China was divided into seven(More)
Recently, IEEE 802.16m was submitted to the ITU and acknowledged as the candidate technology of the IMT-advanced standardization. In this paper, we point out several security issues, such as key agreement blocking and Denial of Service (DoS) attacks, of the key management protocol in IEEE 802.16m. To address the found security issues, we propose an enhanced(More)