密文可更新的去中心化数据存储方案

Decentralized Data Storage Scheme with Updatable Ciphertext

近年来,云计算技术的成熟导致云上存储的数据越来越多。传统的集中式存储架构难以以较低的成本满足数据可靠性的要求,大多数公司都选择了分布式的数据存储方式。当前的分布式存储方式需要管理服务器分发数据块,并且缺少高效的密文更新操作。这会引起一些安全性问题,比如单点故障和数据泄露。针对密文更新和去中心化的需求,提出了一种密文可更新的去中心化数据存储方案。该方案的密文更新包括数据密文和密钥密文,借助对应的更新算法进行更新,保证数据存储和数据访问中的可靠性和安全性。借助以太坊平台,该方案用智能合约替代分布式存储方案中的管理服务器,实现了去中心化。实验结果证明,该方案的计算开销低于目前的方案,智能合约的函数调用成本也处于用户可接受范围内。

In recent years,the maturity of cloud computing technology has led to more and more data stored on the cloud serv-ers.The traditional centralized storage architecture is difficult to meet the requirements of data reliability at a low cost.Most compa-nies choose distributed data storage.The current distributed storage mode requires the management server to distribute data blocks and lacks the efficient operation of ciphertext update.This causes some security problems,such as single point of failure and data leakage.According to the requirements of ciphertext updating and decentralization,a decentralized data storage scheme with cipher-text updatable is proposed.The ciphertext update of this scheme includes data ciphertext and key ciphertext.They are updated with the help of the corresponding update algorithm,so as to ensure the reliability and security in data storage and data access.With the help of Ethereum,this scheme replaces the management server in the distributed storage scheme with smart contract to realize de-centralization.The experimental results show that the computational cost of this scheme is lower than that of the current scheme and the cost of functions in the smart contract is also within the acceptable range of users.