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Doctorat de

Doctorat
Equipe : Réseaux & Optimisation Combinatoire et Stochastique

Lightweight Security Solutions in LTE/LTE/A Networks

Début le 27/10/2011
Direction : BOUKHATEM, Lila

Ecole doctorale : ED STIC 580
Etablissement d'inscription : Université Paris-Sud

Lieu de déroulement : lri reseaux

Soutenue le 08/12/2014 devant le jury composé de :
Directeur de thèse :
Mme. Lila Boukhatem, Maître de Conférences,Université Paris-Sud

Co-encadrant :
M. Steven Martin, Professeur,Université Paris-Sud

Rapporteurs :
Mme. Hakima Chaouchi Professeur, Institut Télécom Sud-Paris,
Mme. Hassnaa Moustafa, Directeur de Recherche Intel Corporation.

Examinateurs :
M. Joffroy Beauquier, Professeur, Université Paris-Sud,
Mme. Thi-Mai-Trang NGUYEN, Maître de Conférence, Université Pierre et Marie Curie-Paris 6,
M. Nadjib Ait saadi, Maître de Conférences, Université Paris Est Créteil Val de Marnes.

Activités de recherche :

Résumé :
Recently, the 3rd Group Project Partnership (3GPP) has developed Long Term Evolution/ Long Term Evolution-Advanced (LTE/LTE-A) systems which have been approved by the International Telecommunication Union (ITU) as 4th Generation (4G) mobile telecommunication networks. Security is one of critical issues which should be handled carefully to protect user's and mobile operator's information. Thus, the 3GPP has standardized algorithms and protocols in order to secure the communications between different entities of the mobile network. However, increasing the security level in such networks should not compel heavy constrains on these networks such as complexity and energy. Indeed, energy efficiency has become recently a critical need for mobile network operators for reduced carbon emissions and operational costs. The security services in mobile networks such as authentication, data confidentiality and data integrity are mostly performed using cryptographic techniques.
However, most of the standardized solutions already adopted by the3GPP depend on encryption algorithms which possess high computational complexity which in turn contributes in consuming further energy at the different network communication parties.
Data confidentiality which mainly refers to the protection of the user’s information privacy is achieved at the Packet Data Convergence Protocol (PDCP) sub-layer in the LTE/LTE-A protocol stack by one of the three standardized algorithms (EEA1, EEA2 and EEA3). However, each of the three algorithms requires high computational complexity since they rely on Shannon’s theory of encryption algorithms by applying confusion and diffusion for several rounds. In our thesis we propose a novel confidentiality algorithm using the concept of substitution and diffusion in which the required security level is attained in only one round. Consequently the computational complexity is considerably reduced which in return results in reducing the energy consumption during both encryption and decryption procedures. Similarly, the same approach is used to reduce the complexity of 3GPP data integrity algorithms (EIA1, EIA2 and EIA3) which the core cipher rely on the same complex functions. Finally, we investigate in this thesis the authentication issue in Device to Device paradigms proposal in 4G systems. Device to Device communications refer to direct communications between two mobile devices without passing through the core network. They constitute a promising mean to increase the performance and reduce energy consumptions in LTE/LTE-A networks. In such context, the authentication and key derivation between two mobile devices have not been well investigated. Thus, a novel lightweight authentication and key derivation protocol is proposed to authenticate two communicating devices during session establishments as well as deriving necessary keys for both data encryption and integrity protection.