CP-ABE cloud data security sharing scheme based on block chain

Abstract

The invention discloses a CP-ABE cloud data security sharing scheme based on a block chain, and the scheme comprises a cloud user behavior tracing mechanism based on the block chain, a cloud data storage and verification mechanism based on the block chain, and a CP-ABE data encryption and decryption mechanism based on the block chain.The scheme has the beneficial effects that the DO uploads the data, so that if the DR wants to acquire the decrypted data; the DR needs to negotiate a key with the DO, the DO has the control right of own data and can determine which user to decrypt the data, two trusted third parties are responsible for key generation in the tuCP-ABE scheme, the data owner does not have the authority to determine who can decrypt the data, the key is negotiated by the two parties of the user without depending on the centralized trusted third parties, the tuCP-ABE scheme not only depends on a centralized trusted third party, but also introduces two third parties in order to ensure safety, so that the key generation efficiency is greatly reduced, and by adding the tuCP-ABE scheme, the generated keys are fewer, the generated ciphertexts are fewer, and the storage occupation is smaller.

Description

technical field [0001] The invention relates to the field of mechanical technology, in particular to a blockchain-based CP-ABE cloud data security sharing scheme. Background technique [0002] For most users, there may be little awareness of uploading encrypted data to the cloud. Most of the existing cloud security storage and sharing is to upload encrypted data. Encrypted sharing and key management have become a very important link. The scheme adopts encryption The key is stored in the group key, and the CKMS system manages the key with the help of CA, and provides a list of users and their permissions. Wei et al. proposed a blockchain-based cloud data integrity protection mechanism, and the Block-Secure scheme also Provides a cloud data security storage solution. The attribute-based encryption proposed by Sahai and Waters effectively supports fine-grained access control policies and is suitable for cloud security sharing. The tuCP-ABE scheme is an attribute-based encrypti...

AI Technical Summary

Problems solved by technology

The scheme proposed by Wei, et al. and the Block-Secure scheme are based on blockchain technology, which can ensure the integrity of data, but it does not solve the problem of data security sharing. Attribute-based encryption technology supports fine-grained access control, but the attribute-based encryption scheme relies on Trusted third party, the tuCP-ABE scheme uses two trusted third parties to ensure security, which reduces the efficiency of key generation. The scheme also requires that the two trusted third parties will not collude;

[0004] Most of the above-mentioned schemes are the improvement of the application of separate technology, but the technology itself has its limitations, and the scheme only mentions that the data itself will not be obtained by malicious users, and does not take into account the control rights of the data provider

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