Attribute based access control for multi-authority systems with constant size ciphertext in cloud computing
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HAND TOOLS USED AT ELECTRONICS WORK PRESENTED BY KOUSTAV SARKAR
Attribute based access control for multi-authority systems with constant size ciphertext in cloud computing
1. Attribute-based access control for multi-authority systems with constant size
ciphertext in cloud computing
Abstract:
In most existing CP-ABE schemes, there is only one authority in the system and all
the public keys and private keys are issued by this authority, which incurs
ciphertext size and computation costs in the encryption and decryption
operations that depend at least linearly on the number of attributes involved in
the access policy. We propose an efficient multi-authority CP-ABE scheme in
which the authorities need not interact to generate public information during the
system initialization phase. Our scheme has constant ciphertext length and a
constant number of pairing computations. Our scheme can be proven CPA-secure
in random oracle model under the decision q-BDHE assumption. When user's
attributes revocation occurs, the scheme transfers most re-encryption work to
the cloud service provider, reducing the data owner's computational cost on the
premise of security. Finally the analysis and simulation result show that the
schemes proposed in this thesis ensure the privacy and secure access of sensitive
data stored in the cloud server, and be able to cope with the dynamic changes of
users' access privileges in large-scale systems. Besides, the multi-authority ABE
eliminates the key escrow problem, achieves the length of ciphertext optimization
and enhances the efficiency of the encryption and decryption operations.
