Nowadays, the popularity of big data cloud storage is getting higher and higher, and the privacy of information is undoubtedly the risk of being leaked. The data security problem caused by this cannot be ignored. Regardless of the architecture used, users can improve their data security in a relatively simple way.
Who keeps the encryption key?
Generally speaking, for different users' data, the cloud storage system will have a specific key to encode. Otherwise, the data information will be very confusing. As for who keeps the key, in addition to being stored by the service itself, it can also be stored by an individual user. When logging in with a password, the service system can directly access the key and automatically unlock the data for use. Therefore, it is convenient for the user to keep the key himself.
However, the security of their own storage is poor. If the ordinary key is held by others, it may be stolen or abused. In fact, the data owner is in an uninformed state. Even some services may have certain security vulnerabilities in practice, which may lead to data theft.
Let users retain control
Some cloud services force users to upload or download the corresponding files through the encryption function. In fact, the purpose of this step is to improve the security of the user key. However, in order to gain additional security, you also need to give up some features, such as the search function application in the cloud storage file.
In fact, such an encrypted cloud service, embedded in a specific application, may bring the risk of data theft. If the user accidentally loses the password, the data is irreparable. Of course, the new mobile app can keep the phone photos encrypted at the same time, and instantly transfer and store them to the cloud.
Self-protection
In order to maximize the security of cloud storage, it is best to combine the characteristics of these different methods. Use your own encryption software to encrypt your data before uploading it to the cloud. Then upload the encoded file to the cloud. When accessing the file again, log in to the service, then download and decrypt it yourself.
Of course, this will make it impossible for users to take advantage of a variety of cloud service features, such as real-time editing of shared documents and searching for cloud storage files. Companies that offer these cloud services are still likely to modify those data, such as changing encrypted files before you download them.
The best way to prevent this is to use authentication encryption. This method not only stores encrypted files, but also stores additional metadata that allows the user to detect if the file has been modified since it was created.
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