Design And Implementation Of Digital Asset Protection System Based On Multi-cloud Terminals

With the rapid development of computer technology,network technology and cloud computing technology,cloud storage services have been widely spread,and people have been used to upload digital information to cloud storage services for storing and sharing.The data stored in cloud storage services will inevitably suffer malicious attacks due to software vulnerabilities,and some human factors or equipment failures will pose security threats to users' data,which often results in serious consequences.Though cloud storage service is bringing people great convenience,at the same time,there are also many security risks while using it.This paper proposes a file data security cloud storage mode(RS multi-cloud storage mode).The file upload process is that the file data in the local machine to be uploaded is changed into 3 data blocks and a code block of equal length using RS erasure code encoding technology,then each data block(three data blocks and a code block)is processed using AES CBC encryption to get cipher text file data,then the MD5 message digest of each cipher text file data is calculated,through the Internet the ciphertext data blocks are uploaded to Alibaba Cloud,Tianyi Cloud,Baidu Cloud and Tencent Cloud object cloud storage services.In that way,the file download process only needs to download data from any three of the four different cloud object storage services,and then the original file data can be obtained through AES CBC decryption and RS erasure code data recovery.This method can tolerate up to one failure of data stored in the cloud object storage service.Compared with the common three-copy redundancy,RS erasure code redundancy technology has higher storage efficiency and fault tolerance efficiency.This paper firstly analyzes the system function demand;secondly introduces the system network structure,system architecture and system database table structure design;thirdly describes the process of the realization of the each function in detail;finally does tests,analysis and comparison with three kinds of file data upload and download file data way of one-cloud plaintext storage,one-cloud cryptograph storage and RS multi-cloud storage.RS multi-cloud storage mode protects the integrity,security and privacy of user digital information,saves storage cost,and has certain fault-tolerant ability.However,this mode has some disadvantages such as RS erasure code encoding and data recovery algorithms are more complex and require a large amount of computation,processing time is longer than other methods.