Based on the spatiotemporal chaotic system, a novel algorithm for constructing a one-way hash function is proposed and analysed. The message is divided into fixed length blocks. Each message block is processed by the ...Based on the spatiotemporal chaotic system, a novel algorithm for constructing a one-way hash function is proposed and analysed. The message is divided into fixed length blocks. Each message block is processed by the hash compression function in parallel. The hash compression is constructed based on the spatiotemporal chaos. In each message block, the ASCII code and its position in the whole message block chain constitute the initial conditions and the key of the hash compression function. The final hash value is generated by further compressing the mixed result of all the hash compression vulues. Theoretic analyses and numerical simulations show that the proposed algorithm presents high sensitivity to the message and key, good statistical properties, and strong collision resistance.展开更多
工业数据库通常包含大量敏感信息,为了保护数据安全,需要对不同用户或用户组设置不同的权限。然而,由于安全访问控制过程易受冗余数据、维度差异等问题的干扰,导致控制时间较长,控制效果不理想。因此,提出区块链下工业数据库访问多级安...工业数据库通常包含大量敏感信息,为了保护数据安全,需要对不同用户或用户组设置不同的权限。然而,由于安全访问控制过程易受冗余数据、维度差异等问题的干扰,导致控制时间较长,控制效果不理想。因此,提出区块链下工业数据库访问多级安全控制算法。采用线性拟合算法填补工业数据库中的缺失值,采用局部性嵌入算法(Locally Linear Embedding,LLE)降维处理工业数据,缩减数据之间的无效规模,完成数据预处理。将处理后数据存储至区块链中,实现一级控制。利用多授权属性加密方案,实现数据的细粒度访问二级控制,完成工业数据库访问的多级安全控制。实验结果表明,所提算法的计算开销小、安全性强,且控制耗时最长仅为20ms。展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. U0735004)the Natural Science Foundation of Guangdong Province,China (Grant No. 05006593)
文摘Based on the spatiotemporal chaotic system, a novel algorithm for constructing a one-way hash function is proposed and analysed. The message is divided into fixed length blocks. Each message block is processed by the hash compression function in parallel. The hash compression is constructed based on the spatiotemporal chaos. In each message block, the ASCII code and its position in the whole message block chain constitute the initial conditions and the key of the hash compression function. The final hash value is generated by further compressing the mixed result of all the hash compression vulues. Theoretic analyses and numerical simulations show that the proposed algorithm presents high sensitivity to the message and key, good statistical properties, and strong collision resistance.
文摘工业数据库通常包含大量敏感信息,为了保护数据安全,需要对不同用户或用户组设置不同的权限。然而,由于安全访问控制过程易受冗余数据、维度差异等问题的干扰,导致控制时间较长,控制效果不理想。因此,提出区块链下工业数据库访问多级安全控制算法。采用线性拟合算法填补工业数据库中的缺失值,采用局部性嵌入算法(Locally Linear Embedding,LLE)降维处理工业数据,缩减数据之间的无效规模,完成数据预处理。将处理后数据存储至区块链中,实现一级控制。利用多授权属性加密方案,实现数据的细粒度访问二级控制,完成工业数据库访问的多级安全控制。实验结果表明,所提算法的计算开销小、安全性强,且控制耗时最长仅为20ms。
