DOTNET PROJECT
A
Practical Attribute-Based Document Collection Hierarchical Encryption Scheme in
Cloud Computing
Abstract:
Ciphertext-policy
attribute-based encryption can provide fine-grained access control and secure
data sharing to the data users in cloud computing. However, the
encryption/decryption efficiency of existing schemes can be further improved
when encrypting a large document collection. In this paper, we propose a
practical Ciphertext-Policy Attribute-Based Hierarchical document collection
Encryption scheme named CP-ABHE. By practical, we mean that CP-ABHE is more
efficient in both computation and storage space without sacrificing data
security. In CP-ABHE, we first construct a set of integrated access trees based
on the documents' attribute sets. We employ the greedy strategy to build the
trees incrementally and grow the trees dynamically by combining the small ones.
Then, all the documents on an integrated access tree are encrypted together.
Different to existing schemes, the leaves in different access trees with the
same attribute share the same secret number, which is employed to encrypt the
documents. This greatly improves the performance of CP-ABHE. The security of
our scheme is theoretically proved based on the decisional bilinear
Diffie-Hellman assumption. The simulation results illustrate that CP-ABHE
performs very well in terms of security, efficiency, and the storage size of
the ciphertext.
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