属性代理重加密的区块链密文云存储共享研究

为了更安全高效地实现信息存储共享服务,提出一种支持关键词检索及属性代理重加密的区块链存储共享方案。采用节点分类和密文存储分离的方式,更好地实现了抗共谋攻击;引入信息交互智能合约,使信息共享双方无需中心机构参与就可以自发地进行通信。利用属性代理重加密算法,信息属主不需要重新加密、上传、下载就可以向其他用户共享信息,在一定程度上减轻云存储器高频访问的压力。通过与现有的属性代理重加密方案进行对比,结果验证了方案的安全性和高效性。

Attribute Proxy Re-encryption for Ciphertext Storage Sharing Scheme on Blockchain

In order to implement the information storage sharing service safely and efficiently, a blockchain storage sharing scheme supporting the attribute proxy re-encryption and keyword retrieval is proposed. By the nodes classification and ciphertext storage separation, the anti-collusion attack is better implemented. The smart contract design of the information transaction is introduced and the information sharing parties can communicate spontaneously without the participation of the central organization. By the attribute-based proxy re-encryption algorithm, the information owner can share the information with other users without re-encrypting, uploading, and downloading information, and relieves the burden of the high-frequency access of the cloud to some extent. Comparing with the other schemes, the scheme is more secure and efficient.