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L'histoire quantitative: reflexions epistemologiques
In: Historical Social Research, Band 8, Heft 1, S. 24-33
This article outlines the present state of the debate on quantitative history in France. J.-L. Robert observes a transformation of "classic" approaches to social and economic history as a result of new statistical tools, now available to historians. He advocates a careful methodological assessment of these techniques of research and discusses in detail problems like the stability of indicators over time, the application of sampling-techniques, and the limits of quantification in history.
Quantitative Evaluation of Information Systems Security ; Évaluation quantitative de la sécurité des systèmes d'information
This dissertation presents a general method for the specification and quantitative evaluation of information systems security. This method allows to monitor the evolutions of an information system in operation, as well as to compare the impact on security of possible modifications of the functioning. It relies on a formal specification of the system security policy, augmented by a model of the vulnerabilities observed in the real system in operation. Then, a security measure represents the difficulty for an attacker to exploit the vulnerabilities and defeat the objectives defined in the security policy.Information systems security policy specification necessitates the definition of a rigorous and expressive framework. Furthermore, the language should be general enough to be usable in the context of an organization. The method defined and used in this work is based on an extension of deontic logic, enriched with a graphical representation.Vulnerabilities of the information system are described by a model called a privilege graph. These vulnerabilities, probed in the system, may have various origins, such as incorrect operation of the protection mechanisms of a computer system, or delegation of privileges in an organization. The assessment of a weight to these individual vulnerabilities allows the definition of highly relevant and global quantitative measures of security.Two practical examples are presented to illustrate the methodology: the study of a medium-size bank agency; and the observation of the security evolutions of a large computer system in operation. ; Cette thèse présente une méthode générale de spécification et d'évaluation quantitative de la sécurité des systèmes d'information. Cette méthode permet de surveiller les évolutions d'un système d'information pendant sa vie opérationnelle, ainsi que de comparer l'impact sur la sécurité de modifications éventuelles du fonctionnement. Elle s'appuie sur une spécification formelle de la politique de sécurité, complétée par un modèle des vulnérabilités du ...
BASE
Quantitative Evaluation of Information Systems Security ; Évaluation quantitative de la sécurité des systèmes d'information
This dissertation presents a general method for the specification and quantitative evaluation of information systems security. This method allows to monitor the evolutions of an information system in operation, as well as to compare the impact on security of possible modifications of the functioning. It relies on a formal specification of the system security policy, augmented by a model of the vulnerabilities observed in the real system in operation. Then, a security measure represents the difficulty for an attacker to exploit the vulnerabilities and defeat the objectives defined in the security policy.Information systems security policy specification necessitates the definition of a rigorous and expressive framework. Furthermore, the language should be general enough to be usable in the context of an organization. The method defined and used in this work is based on an extension of deontic logic, enriched with a graphical representation.Vulnerabilities of the information system are described by a model called a privilege graph. These vulnerabilities, probed in the system, may have various origins, such as incorrect operation of the protection mechanisms of a computer system, or delegation of privileges in an organization. The assessment of a weight to these individual vulnerabilities allows the definition of highly relevant and global quantitative measures of security.Two practical examples are presented to illustrate the methodology: the study of a medium-size bank agency; and the observation of the security evolutions of a large computer system in operation. ; Cette thèse présente une méthode générale de spécification et d'évaluation quantitative de la sécurité des systèmes d'information. Cette méthode permet de surveiller les évolutions d'un système d'information pendant sa vie opérationnelle, ainsi que de comparer l'impact sur la sécurité de modifications éventuelles du fonctionnement. Elle s'appuie sur une spécification formelle de la politique de sécurité, complétée par un modèle des vulnérabilités du ...
BASE
Quantitative Evaluation of Information Systems Security ; Évaluation quantitative de la sécurité des systèmes d'information
This dissertation presents a general method for the specification and quantitative evaluation of information systems security. This method allows to monitor the evolutions of an information system in operation, as well as to compare the impact on security of possible modifications of the functioning. It relies on a formal specification of the system security policy, augmented by a model of the vulnerabilities observed in the real system in operation. Then, a security measure represents the difficulty for an attacker to exploit the vulnerabilities and defeat the objectives defined in the security policy.Information systems security policy specification necessitates the definition of a rigorous and expressive framework. Furthermore, the language should be general enough to be usable in the context of an organization. The method defined and used in this work is based on an extension of deontic logic, enriched with a graphical representation.Vulnerabilities of the information system are described by a model called a privilege graph. These vulnerabilities, probed in the system, may have various origins, such as incorrect operation of the protection mechanisms of a computer system, or delegation of privileges in an organization. The assessment of a weight to these individual vulnerabilities allows the definition of highly relevant and global quantitative measures of security.Two practical examples are presented to illustrate the methodology: the study of a medium-size bank agency; and the observation of the security evolutions of a large computer system in operation. ; Cette thèse présente une méthode générale de spécification et d'évaluation quantitative de la sécurité des systèmes d'information. Cette méthode permet de surveiller les évolutions d'un système d'information pendant sa vie opérationnelle, ainsi que de comparer l'impact sur la sécurité de modifications éventuelles du fonctionnement. Elle s'appuie sur une spécification formelle de la politique de sécurité, complétée par un modèle des vulnérabilités du ...
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Rechtsgeschichte und quantitative Geschichte: Arbeitsberichte
In: Ius commune
In: Sonderhefte, Texte und Monographien 7
Introduction à l'histoire quantitative
In: Travaux de droit, d'économie, de sociologie et de sciences politiques 35
Une théorie quantitative du rationalisme
In: Revue française de science politique, Band 4, Heft 2, S. 401-405
ISSN: 1950-6686
Enquetes qualitatives, enquetes quantitatives
In: Revue française de science politique, Band 63, Heft 1, S. 170
ISSN: 0035-2950
Histoire quantitative, buts et méthodes
In: Cahiers de l'ISEA
In: Série AF, Histoire quantitative de léconomie française 1 = 115 [d. Gesamtw.]
In: Cahiers de l'ISEA 115
Pour une approche quantitative des faillites
International audience ; This paper, published as the editor's introduction to a special issue of Histoire et Mesure on bankruptcies, presents a brief state of recent research on the topic and argues for a more comparative and quantitative approach. ; Cet article, publié en introduction d'un numéro thématique d'Histoire et Mesure consacré aux faillites, présente un point d'étape de l'historiographie récente sur le sujet et plaide pour une approche plus quantitative et comparative.
BASE
Pour une approche quantitative des faillites
International audience ; This paper, published as the editor's introduction to a special issue of Histoire et Mesure on bankruptcies, presents a brief state of recent research on the topic and argues for a more comparative and quantitative approach. ; Cet article, publié en introduction d'un numéro thématique d'Histoire et Mesure consacré aux faillites, présente un point d'étape de l'historiographie récente sur le sujet et plaide pour une approche plus quantitative et comparative.
BASE
Pour une approche quantitative des faillites
International audience ; This paper, published as the editor's introduction to a special issue of Histoire et Mesure on bankruptcies, presents a brief state of recent research on the topic and argues for a more comparative and quantitative approach. ; Cet article, publié en introduction d'un numéro thématique d'Histoire et Mesure consacré aux faillites, présente un point d'étape de l'historiographie récente sur le sujet et plaide pour une approche plus quantitative et comparative.
BASE
Pour une approche quantitative des faillites
International audience ; This paper, published as the editor's introduction to a special issue of Histoire et Mesure on bankruptcies, presents a brief state of recent research on the topic and argues for a more comparative and quantitative approach. ; Cet article, publié en introduction d'un numéro thématique d'Histoire et Mesure consacré aux faillites, présente un point d'étape de l'historiographie récente sur le sujet et plaide pour une approche plus quantitative et comparative.
BASE
Pour une approche quantitative des faillites
International audience ; This paper, published as the editor's introduction to a special issue of Histoire et Mesure on bankruptcies, presents a brief state of recent research on the topic and argues for a more comparative and quantitative approach. ; Cet article, publié en introduction d'un numéro thématique d'Histoire et Mesure consacré aux faillites, présente un point d'étape de l'historiographie récente sur le sujet et plaide pour une approche plus quantitative et comparative.
BASE