A Safe and Reliable Distributed Cloud Storage Method

Abstract

The invention provides a safe and reliable distributed cloud storage method, comprising the steps as follows: step S1, using a key to encrypt or transform original data; step S2, splitting the key and encrypted ciphertext to obtain key data blocks and file ciphertext data blocks, wherein the number of the key data blocks is greater than that of the file ciphertext data blocks; and step S3, assembling the key data blocks and the file ciphertext data blocks into data blocks in a one-to-one mode and storing the data blocks in a cloud server, and storing the remaining key data blocks at a user side, wherein the steps S1, S2 and S3 are implemented at the user side. According to the invention, on one hand, large-capacity low-cost storage of the cloud server can be utilized fully, and on the other hand, a small part of but very important data is held at the user side, safety control over cloud data is ensured, and drawbacks such as uncontrolled data leak caused by the fact that the data security depends entirely on the cloud server are avoided.

Description

technical field [0001] The invention relates to a cloud storage method, in particular to a safe and reliable distributed cloud storage method. Background technique [0002] A distributed cloud storage system is a file storage method in a network environment. The system includes multiple cloud servers accessed by multiple users, and these servers are interconnected through the network to provide storage services as a whole. Specifically, the system can be extended to any number of servers, and many nodes form a storage network. Each node can be distributed in different locations, and the communication and data transmission between nodes can be carried out through the network. When users use the distributed file system , you don’t need to care about which node the data is stored on or from which node you get the data, but only need to manage and store the data in the file system like a local file system. Compared with the traditional file system, the system can make full use...

AI Technical Summary

Problems solved by technology

Although this method increases the data readability rate and reduces the serious consequences of server downtime, the redundancy of the copy leads to a low utilization rate of cloud storage; in addition, if the data on the client end is lost, the situation is more complicated: for example, the key stored on the client end If it is lost, the user can no longer restore the file; if the user's key file is stolen, reading any server data will cause information leakage

[0008] The disadvantage of this existing technology is that the risk of data unavailability is reduced by adding redundant copies, and the encryption key management is implemented by the user to prevent data leakage caused by cloud data theft, although the information security of cloud storage services is improved. , but this method obviously increases the amount of cloud data storage, greatly reduces storage utilization, and the loss of user data will cause irreparable consequences

[0010] The disadvantage of this existing technology is that the data reliability is increased by encoding the ciphertext and the key together to achieve redundant storage, and the cloud storage space is fully utilized to increase storage efficiency

However, this method stores all the ciphertext and keys in the cloud. On the one hand, it increases the decoding cost and time for users to read cloud files. On the other hand, compared with the copy file system, although it increases storage security to a certain extent, because it needs It is enough to obtain multiple data blocks instead of one copy at the same time, but when more than a certain number of server data leaks occur, the original data can be restored without the user's knowledge, and system security is still facing challenges

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