1(Guangxi Cloud Computing and Big Data Collaborative Innovation Center,Guilin University of Electronic Technology,Guilin 541004,China)2(Guangxi Key Laboratory of Trusted Software,Guilin 541004,China)3(Guangxi Key Laboratory of Cryptography and Information Security,Guilin 541004,China)
Abstract：Aiming at the problems of security and low efficiency of file storage in cloud computing platform,a multi-layer fragmentation and obfuscation protection mechanism is proposed.Firstly,the time cost of violent cracking of files and the degree of secrets are used to determine the number of first-level blocks,and then the file blocks are confused and the order of the files is encrypted and saved.Then,according to the implicit segmentation mechanism,the file blocks are secondly cut and numbered,and finally stored in the cloud.Experimental results show the superiority of this method,which can find the best number of blocks and the least number of encryption times,so that the security and processing efficiency of cloud file data can be effectively improved.
2019, Vol. 40 
