The protocol for Secure Cloud-Service System

In the radically changing modernized information systems era, SNS (social network service), cloud service solutions, and a variety of collaborative computing technologies have characterized diverse IT environments. Also, these changes have identified different forms and functions by characterizing people's behavior patterns. With these socio-technical changes, people have recognized security as one of the most important issues in cloud service computing service systems. Particularly, the collaboration service systems result in unnecessary information leakage among the shared and transmitted servers without discrimination, and it has become the most critical issue. Using one more routes as personal one, data-leakage is occurred in and the PD (personal data) could be utilized by the other purposes. As a result, it falls under the abuse or misuse of PD and might produce the privacy infringe and social problems. To address these problems, we propose a scheme, in which each server can see the corresponding message when data is shared and delivered in the cloud service of a collaborative computing environment. With this scheme concept, we design the protocol, DMEDD (designated message encryption for designated decryptor). As a basic tool to construct our scheme, we use “Onion Modification”, which is modified from Onion Routing and just makes use of the property, multi-layered encryption of Onion Routing. As the methods, we utilize “Hybrid Encryption” and two “One-way Hash Key Chains”, in which keys are allocated to each routing server, and the direction of each chain is opposite. These methods can guarantee the security, efficiency, and functionality of our scheme.