一种基于数据分割与分级的云存储数据隐私保护机制

云存储系统数据管理权和所有权的分离导致数据安全和隐私保护难题。传统的基于单纯加密技术的云存储数据隐私保障机制在实际的数据操作过程中带来了较大的系统开销。为了以低开销实现云存储系统中异地托管数据的隐私保护机制,提出了一种基于数据分割与分级的云存储数据隐私保护机制。机制首先将数据合理分割为大小数据块;再分别将小块数据和大块数据部署在本地和异地;然后按数据不同的安全级别需求,联合采用数据染色和不同强度的数据加密技术进行数据染色或加密,以在保护云存储用户数据隐私的同时,提高灵活性,降低系统开销。

NC-MACPABE: Non-centered multi-authority proxy re-encryption based on CP-ABE for cloud storage systems

The cloud storage service cannot be completely trusted because of the separation of data management and ownership, leading to the difficulty of data privacy protection. In order to protect the privacy of data on untrusted servers of cloud storage, a novel multi-authority access control scheme without a trustworthy central authority has been proposed based on CP-ABE for cloud storage systems, called non-centered multi-authority proxy re-encryption based on the cipher-text policy attribute-based encryption(NC-MACPABE). NC-MACPABE optimizes the weighted access structure(WAS) allowing different levels of operation on the same file in cloud storage system. The concept of identity dyeing is introduced to improve the users' information privacy further. The re-encryption algorithm is improved in the scheme so that the data owner can revoke user's access right in a more flexible way. The scheme is proved to be secure. And the experimental results also show that removing the central authority can resolve the existing performance bottleneck in the multi-authority architecture with a central authority, which significantly improves user experience when a large number of users apply for accesses to the cloud storage system at the same time.

多维度健康教育联合康复护理在面部烧伤患者中的应用

探讨多维度健康教育联合康复护理在面部烧伤患者中的应用。方法:选取2018年8月到2019年7月医院收治的40例面部烧伤患者进行研究,按照随机分配的方法分成观察组和对照组,观察组采取多维度健康教育联合康复护理,对照组采取常规护理,对两组患者的护理满意度和生活质量进行对比。结果:观察组患者的护理效果与对照组存在明显的差异,这些差异都具有统计学意义(P<0.05)。结论:在面部烧伤患者中运用多维度健康教育联合康复护理具有良好的效果,可以有效的提高患者生活质量,这种护理方法值得推广。