摘要 : With the wide diffusion of cloud technologies, an ever increasing amount of sensitive data is moved on centralized network-based repository services, providing elastic outsourced storage capacity, available through remote access. ... 展开 With the wide diffusion of cloud technologies, an ever increasing amount of sensitive data is moved on centralized network-based repository services, providing elastic outsourced storage capacity, available through remote access. This introduces new challenges associated to the security and privacy of outsourced data that has to be dynamically created, shared, updated and removed by a large number of users, characterized by different access rights and views structured according to hierarchical roles. 收起