The increasing use of cloud computing, especially in commercial, government and healthcare institutions, started with the use of computerized clouds. Clouds store important data, which reduces the cost of management and ensures easy access. To protect this data, cryptographic methods are used to ensure confidentiality of the data, as well as to secure access to user data and increase trust in cloud technology. In our paper, we suggest a new scheme to support an attribute-based encryption system (ABE) that involves multiple parties such as data owners, data users, cloud servers and authority. A verified and authenticated decryption process for the cloud environment is the imperative feature of our proposed architecture. The data owner encrypts their data and sends it to the cloud. The cloud server performs partial decryption and the final decrypted data are shared for users as per their privileges. Thus, the data owner reduces complexity of productivity by delegating the decryption process to the cloud server. Analysis of the experimental results confirms that data access in the electronic cloud atmosphere is safer due to a controlled multiple-users-rights scheme. Our performance evaluation results show that the proposed model condensed the communication overhead and made Digital Imaging and Communications in Medicine (DICOM) more secure.

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This study presents a two principles, Cryptography and Steganography, each tow methods work separately from the other to ensure a secure content. We are developed an algorithm to increase the safety and reliability of the copyrights of the images or books (etc.) that published on the internet by providing a watermark image (as logo) hiding inside the original file that we want product it. Firstly reading image (the logo image), convert it to binary and encrypted it by using EX-OR with a secret key and embedding it inside a gray image in the LSB (in the 1 st ) and hiding first key in the 2 nd bit and the second key in the 3 rd bit, then we embedding them in the LSB of Original image in RGB to be protected. The two secret keys, first one as an encryption key and the second key using as signature (data) that have been taken from the cover image (original) to make sure the reliability of the image transmitted via the Internet.

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