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Keeping pace with the increase of digital information in use, Cloud storage is in service, which can store one's data from distance through network and various devices and easy to access. Unlike the existing removable storage necessary in order to carry data, it is used many users because it has no limit of memory capacity and no need to carry storage medium. As many users save a great volume of date in Cloud storage, its reliability has become a focus of issue. To protect it from unethical managers and attackers, researches are being conducted on application of a variety of cryptography systems such as searchable encryption and proxy re-encryption to Cloud storage system.
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