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Data traceability and recovery are very important concerns when moving data to the Cloud. The Enhanced Watermarking Approach for Data Integrity and Non-repudiation in Rational Databases (EWRDN) provides data security means as integrity, secrecy, non-repudiation and privacy using data watermarking and compression techniques. These capabilities may enhance the whole security and trust of service providers. It gives the data owners the ability to monitor and recover data, if required. Co-ordinations between different services for data storage, manipulation and retrieval over the Cloud represents the milestone in composing the Database as a Service. Until now and to the best of our knowledge, such a service is not yet realized in a real Cloud environment. In this article, a realization for a proposed EWRDN service with data traceability capabilities is elaborated with the required performance analysis which is the main contribution of this work. A Trusted Authority service co-ordination to operate the proposed service is introduced as well. The results have shown that, the proposed service co-ordination can provide the data traceability features and stands against most of the experienced data security threats through the experiCommunicated by V. Loia. B Mohamed Hamdy ments. Moreover, EWRDN service as a differentiated quality service has been proven to provide two different data compression qualities. It has been shown that within an EWRDN co-ordination, a fixed recovery ratio of compression has been achieved.

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In Cloud environments, resources are provided as services to endusers over the internet upon request. Resources' coordination in the Cloud enables users to reach their resources anywhere and anytime. Ensuring the security in Cloud environment plays an important role, as customers often store important information on Cloud storage services. These services are not always trusted by the data owners. Customers are wondering about the integrity and the availability of their data in the Cloud. Users need to save their data from outsider and insider attackers (i.e. attacker within service providers' coordination's). Moreover, any collateral damage or errors of Cloud services provider arises as a concern as well. Most of the vital security needs and issues regarding data Cloud services are mentioned in this chapter. The purpose of this chapter is to examine recent research related to data security and to address possible solutions. Research of employing uncommon security schemes into Cloud environments has received an increasing interest in the literature, although these schemes are neither mature nor rigid yet. This work aspires to promote the use of security protocols due to their ability to reduce security risks that affect users of data Cloud services.