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We propose a temporal access control scheme to protect and selectively access data in clouds. In many applications like healthcare, online tests, social networks, data should be accessed within a certain period of time. Although access control has been widely studied, temporal access control has not received attention. Ours is the first scheme on temporal access control with user revocation. Our scheme...
Data protection in cloud storage presents significant challenges. Attribute-based encryption (ABE) has been identified as a useful security mechanism for supporting data protection in untrusted environments. ABE enables fine-grained access control over encrypted data and allows individual data owners to define their own data access policy. However, important practical features such as efficient user...
Some of the most challenging issues in data outsourcing scenario are the enforcement of authorization policies and the support of policy updates. Ciphertext-policy attribute-based encryption is a promising cryptographic solution to these issues for enforcing access control policies defined by a data owner on outsourced data. However, the problem of applying the attribute-based encryption in an outsourced...
Security issues in multi-privileged group communications containing multiple data streams are rather difficult to solve, as there are multiple access privileges among users. Traditional key management schemes use a key graph to manage all the keys in a group, which makes one key being shared by many users resulting in the "one-affect-many" problem. In a key-policy attribute-based encryption...
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