The initiative of internet-based virtual computing environment （iVCE） aims to provide the end users and applications with a harmonions, trustworthy and transparent integrated computing environment which will facilit...The initiative of internet-based virtual computing environment （iVCE） aims to provide the end users and applications with a harmonions, trustworthy and transparent integrated computing environment which will facilitate sharing and collaborating of network resources between applications. Trust management is an elementary component for iVCE. The uncertain and dynamic characteristics of iVCE necessitate the requirement for the trust management to be subjective, historical evidence based and context dependent. This paper presents a Bayesian analysis-based trust model, which aims to secure the active agents for selecting appropriate trusted services in iVCE. Simulations are made to analyze the properties of the trust model which show that the subjective prior information influences trust evaluation a lot and the model stimulates positive interactions.展开更多
We describe a batch RSA digital signature scheme in which a signer can sign messages for multiple recipients simultaneously. The construction is quite efficient due to the batch signing method. This is useful to impro...We describe a batch RSA digital signature scheme in which a signer can sign messages for multiple recipients simultaneously. The construction is quite efficient due to the batch signing method. This is useful to improve the performance of a high-loaded signing server, for example a secure electronic transaction （SET） gateway. Theoretical calculations and experimental results show that the proposed scheme can improve the performance of the signing server significantly.展开更多
In this paper, we study an area localization problem in large scale underwater wireless sensor networks （UWSNs）. The limited bandwidth, the severely impaired channel and the cost of underwater equipment all make the...In this paper, we study an area localization problem in large scale underwater wireless sensor networks （UWSNs）. The limited bandwidth, the severely impaired channel and the cost of underwater equipment all make the underwater localization problem very challenging. Exact localization is very difficult for UWSNs in deep underwater environment. We propose a range free method based on mobile detachable elevator transceiver （DET） and 3D multi-power area localization scheme （3D-MALS） to address the challenging problem. In the proposed scheme, the ideas of 2D multi-power area localization scheme （2D-ALS） and utilizing DET are used to achieve the simplicity, location accuracy, scalability and low cost performances. The DET can rise and get down to broadcast its position. And it is assumed that all the underwater nodes underwater have pressure sensors and know their z coordinates. We evaluate the performances of 2D-ALS and our proposed 3D-MALS schemes under both ideal and non-ideal channel propagation conditions, in terms of localization error and localization ratio. The simulation results show that our proposed scheme is much more efficient than the 2D-ALS.展开更多
基金The National Basic Research 973 Program of China (No2005CB321804)
文摘The initiative of internet-based virtual computing environment （iVCE） aims to provide the end users and applications with a harmonions, trustworthy and transparent integrated computing environment which will facilitate sharing and collaborating of network resources between applications. Trust management is an elementary component for iVCE. The uncertain and dynamic characteristics of iVCE necessitate the requirement for the trust management to be subjective, historical evidence based and context dependent. This paper presents a Bayesian analysis-based trust model, which aims to secure the active agents for selecting appropriate trusted services in iVCE. Simulations are made to analyze the properties of the trust model which show that the subjective prior information influences trust evaluation a lot and the model stimulates positive interactions.
基金the National Basic Research Program(973) of China (No. 2005CB321804)
文摘We describe a batch RSA digital signature scheme in which a signer can sign messages for multiple recipients simultaneously. The construction is quite efficient due to the batch signing method. This is useful to improve the performance of a high-loaded signing server, for example a secure electronic transaction （SET） gateway. Theoretical calculations and experimental results show that the proposed scheme can improve the performance of the signing server significantly.
基金the National Basic Research Program (973) of China (Nos.2006CB303007 and 2007CB316506)
文摘In this paper, we study an area localization problem in large scale underwater wireless sensor networks （UWSNs）. The limited bandwidth, the severely impaired channel and the cost of underwater equipment all make the underwater localization problem very challenging. Exact localization is very difficult for UWSNs in deep underwater environment. We propose a range free method based on mobile detachable elevator transceiver （DET） and 3D multi-power area localization scheme （3D-MALS） to address the challenging problem. In the proposed scheme, the ideas of 2D multi-power area localization scheme （2D-ALS） and utilizing DET are used to achieve the simplicity, location accuracy, scalability and low cost performances. The DET can rise and get down to broadcast its position. And it is assumed that all the underwater nodes underwater have pressure sensors and know their z coordinates. We evaluate the performances of 2D-ALS and our proposed 3D-MALS schemes under both ideal and non-ideal channel propagation conditions, in terms of localization error and localization ratio. The simulation results show that our proposed scheme is much more efficient than the 2D-ALS.
