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Doctorate Thesis Defense

Doctorate Thesis defense on March 13th 2014 at 11:00 AM, Sup'Com.

Entitled : Security and Multicast Routing in All Optical Networks

Presented by : Maha SLITI 


President :

Dr. Mourad Zghal

Professor, Higher School of Communications, Tunisia.




Examiners :

Dr. Marian Marciniak

Professor, National Institute of Telecommunications, Poland.


Dr. Rabeh Attia

Professor, Polytechnic School, Tunisia.


Member :

Dr. Badreddine Benkelfat

Professor, Telecom SudParis, France.


Supervisor :

Dr. Noureddine Boudriga

Professor, Higher School of Communications, Tunisia.


All-optical networks represent a promising solution to meet the increasing demand for high-speed, large-capacity communications of new applications. To promote the implementation of optical technology in the telecommunications infrastructure, many challenging issues regarding security filtering, multicast routing and protection against denial of service attacks must be addressed. This thesis presents contributions to the development of all-optical networks concerning security filtering, multicast routing and protection against denial of service attacks. We are interested into two main technologies, Optical encoding and Optical Burst Switching (OBS).

Our contributions can be classified into four issues.

The first issue is related to the security filtering aspect in all-optical networks. To this purpose, we developed a new firewall architecture which adapts to optical networks. The proposed architecture is based the identification of a traffic stream by an optical code-word.

In the second issue, we study the multicast process at the optical layer in order to improve the performance required by bandwidth intensive applications. To this objective, we present an optical multicasting approach based on optical code-words, which are associated to group multicast addresses. In the third issue, we propose two all optical multicasting approaches based on codewords designed for LEO satellites: the first approach is based on the shortest paths and the second approach is based on the concept of virtual multicast trees. For the two approaches, we identify each satellite in the LEO constellation network by an optical codeword.

In the forth issue, we addressed the protection of all optical networks against denial of service attacks. First, we propose the design of a countermeasure module which is able to detect denial of service attacks based on control packets. This type of Dos attacks prevents legitimate optical nodes from reserving wavelengths at intermediate core nodes of the network. The reasoning behind this threat relies on the flooding principle. Second, we propose a worm containment strategy Based on Cost-Benefit analysis and implemented at the optical backbone nodes. Indeed, if a denial of service attack cannot be detected, the second alternative is to contain the source of attacks.