الفهرس | Only 14 pages are availabe for public view |
Abstract The Smart Grid (SG) consists of many subsystems and networks, all working together as a system of systems, many of which are vulnerable a plethora of local or remote attacks. As a result, cyber security plays a crucial role in SG in order to secure the bi-directional communication between the utility providers side and the consumer side. One of the key security challenges in the SG system is to design an adequately secure key management method aimed to ensure SG data condentiality and integrity. However, most of the existing key management protocols adopt a centralized feature, which depends on a single server to distribute keys and update them. In this thesis, we introduce the idea of securing communication in a distributed way or self-organized This research addresses dierent aspects to achieve a reliable and secure smart grid communications framework. The dissertation is a collection of six chapters. Chapter 1, the smart grid system architecture is introduced and the benets that the smart grid has entered to the traditional electric power. In Chapter 2, the com- ponents of SG as stated by National Institute of Standards and Technology (NIST) is introduced followed by security requirements needed in the SG (i.e. condentiality, in- tegrity, and availability) and a review of key management protocols is also introduced. Chapter 3, presents a literature review of eorts that exist about to the key management area with a critical analyze to them. Chapter 4 introduces a self-organized or distributed key management tailored for secure communications within the microgrid which may be in islanded mode and isolated from the main grid. Also, security and performance anal- ysis is introduced with comparison with existing research papers to show demonstrate its eectiveness and scalability by taking into account the computation and communi- cation costs. Chapter 5 introduces a full enhanced framework for secure communication in a distributed way. Firstly, an ecient key agreement protocol, which is based on the Die-Hellman (DH) key establishment with less computation overhead especially on the i resource-constrained smart meters. Secondly, a self-organized or distributed multicast key management for secure communication through the microgrid which is accomplished by combining the Die-Hellman(DH) cryptography with the symmetric cryptosystem. Fi- nally, security and performance analysis for the proposed schemes with compassion with existing schemes to demonstrates that our proposal is ecient and scalable in the context of key management. Chapter 6 provides a summary of the research and some hints for further improvements. |