A safe, controllable and efficient data sharing method and system in a cloud computing environment

Abstract

The invention discloses a safe, controllable and efficient data sharing method and system in a cloud computing environment. The method comprises the following steps: setting a system public parameterPP and a system master key MSK; generating a public key PK and a private key SK of the data owner according to the parameter PP;generating a conversion key TK and a recovery key RK of the data consumer according to the parameter PP, the main key MSK and the attribute set (please see the formula in the specification); encrypting the plaintext message m according to the parameter PP, the private keySK and the access control structure, and generating a file original ciphertext CT (Computed Tomography); converting the key TK according to the parameter PP, and performing outsourcing decryption onthe CT to generate a file intermediate ciphertext TCT; and according to the parameter PP, the public key PK and the recovery key RK, carrying out decryption operation on the file intermediate ciphertext TCT, and verifying whether the file intermediate ciphertext TCT is a plaintext message m encrypted by the data owner. According to the invention, the user can efficiently verify the correctness ofoutsourcing calculation and authenticate the data source.

Description

technical field [0001] The present invention relates to the field of outsourcing services under the cloud computing environment and the field of data encryption and data authentication for network security. In particular, a safe, controllable and efficient data sharing system and method are realized in the cloud computing environment. The method utilizes a cloud server Outsourced computing capabilities, on the premise of ensuring data confidentiality, effectively reduce user communication and computing overhead, and realize the verifiability of outsourced computing and data sources, and detect whether the cloud server has calculated errors or forged data. Background technique [0002] With the rapid development of cloud computing technology, data sharing has become one of the current research and application hotspots. Attributed Encryption (ABE), as a public key encryption scheme with one-to-many encryption characteristics, is an important technical tool to realize secure da...

AI Technical Summary

Problems solved by technology

[0004] Although the ABE scheme can be used as a powerful tool for secure and flexible data sharing in cloud computing scenarios, it has a major disadvantage in practical applications: the cost of decryption computation grows linearly with the complexity of the access control structure, which is critical for computing Users of resource-constrained devices are a serious usage bottleneck

It can be seen that the verifiable outsourcing decryption scheme cannot provide data authentication function, and there are security problems in practical applications

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