No abstract

In the developing technologies in the computers the cloud computing is one the way to provide services through the internet to the users in the efficient manner. Cloud based services not only provide users with convenience, but also bring many security issues. The user can store his data in the cloud service. Although cloud computing brings great convenience to enterprises and users, the cloud computing security has always been a major hazard. For users, it is necessary to take full advantage of cloud storage service, and also to ensure data privacy. The system proposed a fine-grained two-factor authentication (2FA) access control system, 2FA access control system, an attribute-based access control mechanism is implemented with the necessity of both user secret key and a BBS+ Signatures. The mechanism implemented using CP-IBE(cipher text ide encryption) and digit signature authority, compare to existing method which provide the paranoid security and achieving the secure data access in cloud computing.

No abstract

This work proposes a novel scheme for separable reversible data hiding in encrypted images. In the first phase, a content owner encrypts the original uncompressed image using an encryption key. Then, a data-hider may compress the least significant bits of the encrypted image using a data-hiding key to create a sparse space to accommodate some additional data. With an encrypted image containing additional data, if a receiver has the data-hiding key, can extract the additional data though the image content is not known. If the receiver has the encryption key, then can decrypt the received data to obtain an image similar to the original one, but cannot extract the additional data. If the receiver has both the data hiding key and the encryption key, can extract the additional data and recover the original content without any error by exploiting the spatial correlation in natural image when the amount of additional data is not too large.