Security distributed data management method based on public cloud

Abstract

The invention discloses a security distributed data management method based on a public cloud. The security distributed data management method comprises the following steps: assuming that m public cloud spaces exist, extracting a storage directory structure on a local computer, encrypting all files in a directory, dividing each encrypted file into m blocks, sharing and dividing key secrets into m blocks, respectively sending the files and the key blocks into the m public cloud spaces, and sharing directory tree secrets into the m public cloud spaces. In the event of searching a specific file and downloading a file, a directory tree is fetched and restored from any n public cloud spaces at first, wherein n is less than m; the file is searched from the directory tree; then, sub-file blocks and sub-key blocks are continuously fetched from the n public cloud spaces according to the searching result; the file blocks are combined; simultaneously, a key is recovered; and finally, an original file is obtained by decrypting the file. By means of the technical scheme provided by the invention, data information in any insufficient n public cloud spaces is insufficient to recover the original file; therefore, the data information security is increased; and the risk in leaking user data information is reduced.

Description

technical field

[0001] The invention relates to a public cloud space storage technology for data, in particular to a safe distributed data management method based on a public cloud. Background technique

[0002] With the continuous maturity of cloud computing technology, cloud storage provides users with almost unlimited storage capacity for file storage, provides automatic synchronization between different devices, and provides data sharing channels for different users. There are more and more cloud products on the market, and a large number of users are gradually shifting to the public cloud.

[0003] However, while cloud storage technology brings quickness and convenience to users, data security issues such as privacy leakage also follow. For example, in September 2014, foreign hackers suspected that Apple Inc.'s iCould cloud disk system loopholes caused the Hollywood pornography scandal. Relying on a specific cloud service provider also brings security risks of data lo...

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