Despite that existing data sharing systems in online social networks （OSNs） propose to encrypt data before sharing, the multiparty access control of encrypted data has become a challenging issue. In this paper, we p...Despite that existing data sharing systems in online social networks （OSNs） propose to encrypt data before sharing, the multiparty access control of encrypted data has become a challenging issue. In this paper, we propose a secure data sharing scheme in 0SNs based on ciphertext-policy attribute- based proxy re-encryption and secret sharing. In order to protect users＇ sensitive data, our scheme allows users to customize access policies of their data and then outsource encrypted data to the OSNs service provider. Our scheme presents a multiparty access control model, which enables the disseminator to update the access policy of ciphertext if their attributes satisfy the existing access policy. Further, we present a partial decryption construction in which the computation overhead of user is largely reduced by delegating most of the decryption operations to the OSNs service provider. We also provide checkability on the results returned from the OSNs service provider to guarantee the correctness of partial decrypted ciphertext. Moreover, our scheme presents an efficient attribute revocation method that achieves both forward and backward secrecy. The security and performance analysis results indicate that the proposed scheme is secure and efficient in OSNs.展开更多
Senior Healthcare Business in Thailand tends to be great success since Thailand is now moving towards aging society and will be a full completed aging society by 2025. The best candidates for healthcare business entre...Senior Healthcare Business in Thailand tends to be great success since Thailand is now moving towards aging society and will be a full completed aging society by 2025. The best candidates for healthcare business entrepreneur are registered nurses since they have sill and knowledge to provide cares for senior citizens. The regular customers often emphasize on choosing the healthcare providers from the entrepreneurs that have the expert knowledge in their professional career. The key factors to make this kind of business to be successful are education, investment plan, place, entrepreneur, supporters, and strategy. In addition, the 4P analyses for preparing of market are products, price, place, and promotion. The success of senior healthcare business depends on the entrepreneurs who possess skill, knowledge, and ability to manage stability and sustainability.展开更多
Since the last century, China has carried out the reform of public utilities in the ninety time, and has achieved many positive results. The quality and efficiency of public goods supply is greatly improved. The gover...Since the last century, China has carried out the reform of public utilities in the ninety time, and has achieved many positive results. The quality and efficiency of public goods supply is greatly improved. The government has changed the role of producer and provider from the past to the role of provider and regulator, which effectively promoted the development of the privatization of public utilities. However, in the achievements there has also been some problems, such as too much emphasis on efficiency to the neglect of social justice and the government＇s public responsibility ＂efficiency generalization＂ problem that requires our attention.展开更多
基金This work has been supported by the National Natural Science Foundation of China under Grant No.61272519,the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No.20120005110017,and the National Key Technology R&D Program under Grant No.2012BAH06B02
文摘Despite that existing data sharing systems in online social networks （OSNs） propose to encrypt data before sharing, the multiparty access control of encrypted data has become a challenging issue. In this paper, we propose a secure data sharing scheme in 0SNs based on ciphertext-policy attribute- based proxy re-encryption and secret sharing. In order to protect users＇ sensitive data, our scheme allows users to customize access policies of their data and then outsource encrypted data to the OSNs service provider. Our scheme presents a multiparty access control model, which enables the disseminator to update the access policy of ciphertext if their attributes satisfy the existing access policy. Further, we present a partial decryption construction in which the computation overhead of user is largely reduced by delegating most of the decryption operations to the OSNs service provider. We also provide checkability on the results returned from the OSNs service provider to guarantee the correctness of partial decrypted ciphertext. Moreover, our scheme presents an efficient attribute revocation method that achieves both forward and backward secrecy. The security and performance analysis results indicate that the proposed scheme is secure and efficient in OSNs.
文摘Senior Healthcare Business in Thailand tends to be great success since Thailand is now moving towards aging society and will be a full completed aging society by 2025. The best candidates for healthcare business entrepreneur are registered nurses since they have sill and knowledge to provide cares for senior citizens. The regular customers often emphasize on choosing the healthcare providers from the entrepreneurs that have the expert knowledge in their professional career. The key factors to make this kind of business to be successful are education, investment plan, place, entrepreneur, supporters, and strategy. In addition, the 4P analyses for preparing of market are products, price, place, and promotion. The success of senior healthcare business depends on the entrepreneurs who possess skill, knowledge, and ability to manage stability and sustainability.
文摘Since the last century, China has carried out the reform of public utilities in the ninety time, and has achieved many positive results. The quality and efficiency of public goods supply is greatly improved. The government has changed the role of producer and provider from the past to the role of provider and regulator, which effectively promoted the development of the privatization of public utilities. However, in the achievements there has also been some problems, such as too much emphasis on efficiency to the neglect of social justice and the government＇s public responsibility ＂efficiency generalization＂ problem that requires our attention.
