الفهرس 
IntroductionOnly 14 pages are availabe for public view
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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 con dentiality 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
di erent 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 bene ts 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. con dentiality, in-
tegrity, and availability) and a review of key management protocols is also introduced.
Chapter 3, presents a literature review of e orts 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 e ectiveness 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.