In cloud computing applications, the data security is a primary concern of user. In this paper, for the problem that data of the HDFS cannot be destroyed completely in open source cloud storage system, which may lead to data leakage, it designs a destruction mechanism of HDFS with multiple security level. This mechanism make data effectively destroyed by the method of data overwrite which makes a balance between security requirements and performance requirements. The Simulation experiments show that the mechanism can override a Block file in HDFS environment effectively to achieve the purpose of data destroying. At the same the overhead of different overwrite algorithm is different also which can ensure the security and efficiency is balanced.
With the rapid development of cloud computing, Security problems has become one of the major obstacle against it. In this paper, we present a hybrid encryption scheme based on the characteristics of RC5 and ECC encryption to deal with security issues caused by data residue in static storage and Save the storage space at the same time.
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