Global financial crises might and should be recognized as a potential chance to introduce changes in managing our business, both in financial and other important private and/or public sectors. The prevailing opinion i...Global financial crises might and should be recognized as a potential chance to introduce changes in managing our business, both in financial and other important private and/or public sectors. The prevailing opinion is that a lack of corporative social responsibility is one of the major reasons that lead to global crises occurrence. Nowadays, it is crucial to use the experiences of other industries and sectors which from their very beginning managed to balance finance and social goals at the same time. Microfinance sector is exactly one such sector. This paper is organized as follows： First, we give some overview of different approaches to measuring social performance of microfinance institutions. In this part of the paper we also accent the specifics of microfinance institutions-management within the context of double bottom line. In the second part we focus our analysis on practical implementation of ＂double bottom line management in Prizma MCO, one of the world pioneers in social performance management, by using their revolutionary poverty scorecard system. Then, we analyze how these social performance data are used in decision-making and how it affects overall performance of the organization. The paper is finished with some conclusions and lessons learned.展开更多
Cloud data sharing service, which allows a group of people to work together to access and modify the shared data, is one of the most popular and efficient working styles in the enterprises. However, the cloud server i...Cloud data sharing service, which allows a group of people to work together to access and modify the shared data, is one of the most popular and efficient working styles in the enterprises. However, the cloud server is not completely trusted, and its security could be compromised by monetary reasons or caused by hacking and hardware errors. Therefore, despite of having advantages of scalability and flexibility, cloud storage service comes with privacy and the security concerns. A straightforward method to protect the user's privacy is to encrypt the data stored at the cloud. To enable the authenticated users to access the encrypted cloud data, a practical group key management algorithm for the cloud data sharing application is highly desired. The existing group key management mechanisms presume that the server is trusted. But, the cloud data service mode does not always meet this condition. How to manage the group keys to support the scenario of the cloud storage with a semi-trusted cloud server is still a challenging task. Moreover, the cloud storage system is a large-scale and open application, in which the user group is dynamic. To address this problem, we propose a practical group key management algorithm based on a proxy re-encryption mechanism in this paper. We use the cloud server to act as a proxy tore-encrypt the group key to allow authorized users to decrypt and get the group key by their private key. To achieve the hierarchical access control policy, our scheme enables the cloud server to convert the encrypted group key of the lower group to the upper group. The numerical analysis and experimental results further validate the high efficiency and security of the proposed scheme.展开更多
文摘Global financial crises might and should be recognized as a potential chance to introduce changes in managing our business, both in financial and other important private and/or public sectors. The prevailing opinion is that a lack of corporative social responsibility is one of the major reasons that lead to global crises occurrence. Nowadays, it is crucial to use the experiences of other industries and sectors which from their very beginning managed to balance finance and social goals at the same time. Microfinance sector is exactly one such sector. This paper is organized as follows： First, we give some overview of different approaches to measuring social performance of microfinance institutions. In this part of the paper we also accent the specifics of microfinance institutions-management within the context of double bottom line. In the second part we focus our analysis on practical implementation of ＂double bottom line management in Prizma MCO, one of the world pioneers in social performance management, by using their revolutionary poverty scorecard system. Then, we analyze how these social performance data are used in decision-making and how it affects overall performance of the organization. The paper is finished with some conclusions and lessons learned.
基金partially supported by National Natural Science Foundation of China No.61202034,61232002,61303026,6157237861402339CCF Opening Project of Chinese Information Processing No.CCF2014-01-02+2 种基金the Program for Innovative Research Team of Wuhan No.2014070504020237Fundamental Application Research Plan of Suzhou City No.SYG201312Natural Science Foundation of Wuhan University No.2042016gf0020
文摘Cloud data sharing service, which allows a group of people to work together to access and modify the shared data, is one of the most popular and efficient working styles in the enterprises. However, the cloud server is not completely trusted, and its security could be compromised by monetary reasons or caused by hacking and hardware errors. Therefore, despite of having advantages of scalability and flexibility, cloud storage service comes with privacy and the security concerns. A straightforward method to protect the user's privacy is to encrypt the data stored at the cloud. To enable the authenticated users to access the encrypted cloud data, a practical group key management algorithm for the cloud data sharing application is highly desired. The existing group key management mechanisms presume that the server is trusted. But, the cloud data service mode does not always meet this condition. How to manage the group keys to support the scenario of the cloud storage with a semi-trusted cloud server is still a challenging task. Moreover, the cloud storage system is a large-scale and open application, in which the user group is dynamic. To address this problem, we propose a practical group key management algorithm based on a proxy re-encryption mechanism in this paper. We use the cloud server to act as a proxy tore-encrypt the group key to allow authorized users to decrypt and get the group key by their private key. To achieve the hierarchical access control policy, our scheme enables the cloud server to convert the encrypted group key of the lower group to the upper group. The numerical analysis and experimental results further validate the high efficiency and security of the proposed scheme.
