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- W2078366905 abstract "La connexion de systemes critiques a Internet pose de serieux problemes de securite. En effet, les techniques classiques de protection sont souvent inefficaces, dans ce nouveau contexte. Dans cette these, nous proposons une architecture generique tolerant les intrusions pour serveurs Internet. Cette architecture est basee sur les principes de redondance avec diversification afin de renforcer les capacites du systeme a faire face aux attaques. En effet, une attaque vise generalement une application particuliere sur une plateforme particuliere et s’avere tres souvent inefficace sur les autres. L’architecture comprend plusieurs serveurs Web (COTS) redondants et diversifies, et un ou plusieurs mandataires mettant en œuvre la politique de tolerance aux intrusions. L’originalite de cette architecture reside dans son adaptabilite. En effet, elle utilise un niveau de redondance variable qui s’adapte au niveau d’alerte. Nous presentons deux variantes de cette architecture destinees a differents systemes cibles. La premiere architecture est destinee a des systemes completement statiques ou les mises a jours sont effectuees hors-ligne. La deuxieme architecture est plus generique, elle considere les systemes completement dynamiques ou les mises a jours sont effectuees en temps reel. Elle propose une solution basee sur un mandataire particulier charge de gerer les acces a la base de donnees. Nous avons montre la faisabilite de notre architecture, en implementant un prototype dans le cadre d’un exemple d’une agence de voyages sur Internet. Les premiers tests de performances ont ete satisfaisants, les temps de traitements des requetes sont acceptables ainsi que le temps de reponse aux incidents.The connection of critical systems to the Internet is raising serious security problems, since the conventional protection techniques are rather inefficient in this new context. This thesis proposes a generic architecture for intrusion tolerant Internet servers. This architecture is based on redundancy and diversification principles, in order to increase the system resilience to attacks: usually, an attack is targeted at a particular software, running on a particular platform, and fails on others. The architecture is composed of redundant tolerance proxies that mediate client requests to a redundant bank of diversified application servers (COTS). The redundancy is deployed here to increase the availability and integrity of the system. To improve its performance, we have introduced the notion of adaptive redundancy: the redundancy level is selected by the proxies according to the current alert level. We present two architecture variants targeting different classes of Internet servers. The first one is proposed for fully static servers such as Web distribution with static content that provide stable information, which can be updated offline. The second architecture is proposed for fully dynamic systems where the updates are executed immediately on the on-line database. We have demonstrated the feasibility of this architecture by implementing an example of an Internet travel agency. The first performance tests are satisfactory, with acceptable request execution times and fast enough recovery after incidents." @default.
- W2078366905 created "2016-06-24" @default.
- W2078366905 creator A5037841784 @default.
- W2078366905 date "2005-01-28" @default.
- W2078366905 modified "2023-09-25" @default.
- W2078366905 title "Conception et réalisation d’une architecture tolérant les intrusions pour des serveurs Internet" @default.
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