In order to implement privacy-preserving, efficient and secure data storage
and access environment of cloud storage, the following problems must be
considered: data index structure, generation and management of keys, data
retrieval, treatments of change of users? access right and dynamic operations
on data, and interactions among participants. To solve those problems, the
interactive protocol among participants is introduced, an extirpation-based
key derivation algorithm (EKDA) is designed to manage the keys, a double
hashed and weighted Bloom Filter (DWBF) is proposed to retrieve the encrypted
keywords, which are combined with lazy revocation, multi-tree structure,
asymmetric and symmetric encryptions, which form a privacypreserving,
efficient and secure framework for cloud storage. The experiment and security
analysis show that EKDA can reduce the communication and storage overheads
efficiently, DWBF supports ciphertext retrieval and can reduce communication,
storage and computation overhead as well, and the proposed framework is
privacy preserving while supporting data access efficiently.
GROUP KEY MANAGEMENT FOR MULTICAST STRUCTURES TO IMPROVE SECURED DATA ACCESS
