Data sharing is a main application of cloud computing. Some existing solutions are proposed to provide flexible access control for outsourced data in the cloud. However, few attentions have been paid to group-oriented...Data sharing is a main application of cloud computing. Some existing solutions are proposed to provide flexible access control for outsourced data in the cloud. However, few attentions have been paid to group-oriented data sharing when multiple data owners want to share their private data for cooperative purposes. In this paper, we put forward a new paradigm, referred to as secure, scalable and efficient multi-owner(SSEM) data sharing in clouds. The SSEM integrates identity-based encryption and asymmetric group key agreement to enable group-oriented access control for data owners in a many-to-many sharing pattern. Moreover, with SSEM, users can join in or leave from the group conveniently with the privacy of both group data and user data.We proposed the key-ciphertext homomorphism technique to construct an SSEM scheme with short ciphertexts. The security analysis shows that our SSEM scheme achieves data security against unauthorized accesses and collusion attacks. Both theoretical and experimental results confirm that our proposed scheme takes users little costs to share and access outsourced data in a group manner.展开更多
电子病历(Electronic Medical Record,EMR)作为病人医疗信息载体,能够为医生提供真实有效的病人过往病情信息。同时随着互联网的快速发展,云计算的出现让电子病历可以跨医院实现共享,为医生更快速有效地判断病人病情并提供有效的治疗手...电子病历(Electronic Medical Record,EMR)作为病人医疗信息载体,能够为医生提供真实有效的病人过往病情信息。同时随着互联网的快速发展,云计算的出现让电子病历可以跨医院实现共享,为医生更快速有效地判断病人病情并提供有效的治疗手段。该文建立了基于云计算的Web服务连接各医院数据信息库实现电子病历区域数据共享,同时使用XML技术使信息快速转换并且信息储存具有高度私密性。通过测试表明,基于云计算技术的电子病历管理系统,能够实现病人电子病历数据的安全有效传输。展开更多
基金supported in part by National High-Tech Research and Development Program of China(“863”Program)under Grant No.2015AA016004National Natural Science Foundation of China under Grants No.61173154,61272451,61572380
文摘Data sharing is a main application of cloud computing. Some existing solutions are proposed to provide flexible access control for outsourced data in the cloud. However, few attentions have been paid to group-oriented data sharing when multiple data owners want to share their private data for cooperative purposes. In this paper, we put forward a new paradigm, referred to as secure, scalable and efficient multi-owner(SSEM) data sharing in clouds. The SSEM integrates identity-based encryption and asymmetric group key agreement to enable group-oriented access control for data owners in a many-to-many sharing pattern. Moreover, with SSEM, users can join in or leave from the group conveniently with the privacy of both group data and user data.We proposed the key-ciphertext homomorphism technique to construct an SSEM scheme with short ciphertexts. The security analysis shows that our SSEM scheme achieves data security against unauthorized accesses and collusion attacks. Both theoretical and experimental results confirm that our proposed scheme takes users little costs to share and access outsourced data in a group manner.
文摘电子病历(Electronic Medical Record,EMR)作为病人医疗信息载体,能够为医生提供真实有效的病人过往病情信息。同时随着互联网的快速发展,云计算的出现让电子病历可以跨医院实现共享,为医生更快速有效地判断病人病情并提供有效的治疗手段。该文建立了基于云计算的Web服务连接各医院数据信息库实现电子病历区域数据共享,同时使用XML技术使信息快速转换并且信息储存具有高度私密性。通过测试表明,基于云计算技术的电子病历管理系统,能够实现病人电子病历数据的安全有效传输。