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英文Abstract：Cloud storage service is the most basic service in the field of cloud computing，which has great potential for development and has become increasingly hot in recent years.Cloud storage security technology is a combination of existing technologies so that there exists possibilities of data leakage and there are many concerns about users′ data storage security.It is hoped to improve the performance of cloud storage security encryption algorithm through the study of the traditional security encryption algorithm and analysis of its advantages and disadvantages.Aiming at its shortcomings，we propose a more secure and efficient cross-encryption algorithm based on symmetric encryption algorithm DES and asymmetric encryption algorithm RSA，which gives full play to the advantages of these two traditional encryption algorithms.At last，the performance of this algorithm is verified on Hadoop platform.With this method，different types of files are decrypted and compared with the traditional secure encryption algorithm.The results show that this algorithm is more secure and efficient.