Sharif Digital Repository

Data outsourcing is considered as a promising approach in today computing and connected world. This approach enables organizations to outsource their data to anexternal third party server which is responsible for storing and propagation of outsourced data. Although data outsourcing offers many benefits, especially for those organizations with limited resources and increaseing data volume, but this approach in security aspects like providing confidentiality and privacy about curious external third party or other threats, is faced by serious challenges. In the recent decade many approaches for solving or at least decreasing the potential threats over providing confidentiality of outsourced... 

Outsourcing has considerably increased in number, as evident by the literature. Many activities, once being carried out by the organization itself, are now accomplished by contractors. Nowadays, implementing successful outsourcing projects is an important and challenging deal for outsourcer organizations. Such organizations always aim to finish their projects based on a defined scope of time, budget and quality while accepted by the final customer. Managers are trying to use outsourcing strategy more extensively but are faced with various problems in practice. So it’s advantageous to perform a research to identify these difficulties to be able to employ this strategy more efficiently. Due to... 

Data outsourcing is a process that delegates storage, retrieval, and management of data to an external storage service provider. Data outsourcing will create security challenges for data owners despite decreasing the costs. The most important security challenges in this process are to maintain the confidentiality of data in order to prevent the server's access to information and to ensure that data retrieved from the server is correct. Numerous studies have been conducted to address each of these concerns, each with specific capabilities and overheads. The presented methods generally support some parts of the database's functionality, and feature enhancement in them is along with an increase... 

Success in a business will be met by the different factors, of which one of the most important is design and execution of a good business model upon the inauguration of each company. Indicating the commercialization of innovations and innovative commercial ideas, it shows the productivity of innovation. Outsourcing the Training management in organizations is an issue the world pioneer organizations feel its necessity. Training systems in organizations have limited resources, don't have the required knowledge and financial sufficiency for effective execution of all Training processes. Therefore, Training management outsourcing may be a good alternative for meeting perspective and facilitating... 

Recently many organizations outsource their data to an external server due to easier data maintenance. One of the security issues in data outsourcing scenario is the enforcement of data owner’s access control policies. This includes some challenges; namely, the number of keys needed to access authorized resources, efficient policy updating, write access control enforcement, user and data owner overhead, and preserving confidentiality of data and policies . Most of the existing proposed solutions address only some of these challenges, while they impose high overhead on both the data owner and users. Moreover, most of them address enfrocement of policies in form of access control matrix and... 

The ever-increasing volume of data and the lack of computational and storage facilities have caused a managerial challenge to organizations. The existence of these challenges on the one hand and the increase of storage services on the other hand have compelled the organizations to delegate their storage and management of data to the server providers of cloud storage services. The outsourcing of data to servers obviates the need for purchasing exorbitant storage equipment and recruiting professional workforce in the organization. Since the organization’s data will be kept outside the organization’s ambience in case of using such services in form of outsourcing, and the data will not be under... 

As cloud computing becomes a ubiquitous technology, data outsourcing, which means delegating storage and retrieval of the data to an extraneous service provider, becomes more popular. One of the main issues in data outsourcing is preserving data confidentiality and privacy. A common solution to this problem is encrypting the data before outsourcing, but this approach prevents the service provider from doing computations on the data. A trivial solution is to transfer all of the data to the client-side and decrypt it before doing the computations, but this solution imposes a large overhead on the client-side and contradicts the philosophy of outsourcing. Till now, so many encryption schemes... 

Infrastructural costs of data management, have led people and organizations to outsource their data. This approach is facing with some significant security challenges and risks. The goal of this research, is to present an architecture for secure outsourcing of data in a way that used methods, storage processes, query processing methods and access control mechanisms work together to preserve confidentiality and integrity of outsourced data. In this architecture, the main challenge is transparent placement of some components between client and server in order to prevent user from being aware of communication with a secured server. In order to create this degree of transparency, we need to pay...