Research On Data Deletion In Cloud Storage

With the fast development of cloud storage, more and more people now store their data in cloud storage to save the cost of buying additional storage device. Thereby, how to keep the data in cloud storage with privacy and integrity is a security problem that people need to consider. Especially when users request to delete data in cloud storage, how can we ensure that the data is indeed removed from the storage device of cloud storage and remain inaccessible to other people.According to this security issue, we first make a brief introduction of cryptography and secure file deletion techniques. Through the study of these techniques, we design and implement a secure file deletion scheme which is based on attribute.The main idea of Attribute based securely file deletion is that we associated a file with one or more access attributes, and generate a control key for each attribute. When a file is going to upload to the cloud storage, we use an encryption key and a series of control keys to protect the file. When the file is going to be deleted, we remove the corresponding keys of the file. Thus others cannot access the file even if they obtain the file.We then introduce the version control technique in cloud storage, and add the version control module to the Attribute based securely file deletion scheme.