Sicherheitsschnittstellen — Konzepte, Anwendungen und by K.-W. Schröder, M. Ullmann, F. Koob (auth.), Walter Fumy,

By K.-W. Schröder, M. Ullmann, F. Koob (auth.), Walter Fumy, Gisela Meister, Manfred Reitenspieß, Wolfgang Schäfer (eds.)

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Additional resources for Sicherheitsschnittstellen — Konzepte, Anwendungen und Einsatzbeispiele: Proceedings des Workshops Security Application Programming Interfaces ’94 am 17.–18. November 1994 in München

Example text

Die Schnittstellenfunktionen, in welchen der Schliissel verwendet werden kann, k6nnen - je nach Funktionsumfang und Bedrohungssituation ebenfalls zu I(k) geh6ren. B. Insiderbedrohungen durch andere Nutzer) ist die Information iiber zugriffsberechtigte Subjekte fUr Schliissel auch als Element der Komponente I(k) zu betrachten. 2. ) gemachte Annahme generell nicht aufrecht zu halten. Der grundsatzliche Ansatz zur Verallgemeinerung ist es, auch Schliissel - oder allgemeiner: Klartexttoken - durch kryptographische Verfahren zu schiitzen.

Unsichere Bereiche gelangen. Das Klartexttoken (k,KI(k», welches benotigt wird, urn auf den darin eingekapselten Schliissel k zugreifen zu konnen, wird unter Verwendung des KEK in sicheren Bereichen wieder aus dem Chiffretexttoken berechnet. Dies ist in Abb. 2 skizziert. Die Information zur Schliisselfunktion und zum Schliisselbesitzer bildet dabei exemplarisch die integre Keyinformation I(k). Input: Schliisselspezifikation Sicherheitsschnittstelle Schliisselspeicher t t t t Authentikationsschnittstelle Sicherheitsmodul Token (f(KEK,CI(k),C(k),I(k», I(k),R(k)) Output: Authentikationsinformation FunktionsIdentitiitsDaten spezifikation information 1--+ ~ Authentikationsmodul (i) Benutzt - Token, - Funktionsspezifikation, - Authentisierte Identitiit, KEK zur Berechn ung des Schl iissels k (ii) Anwendung des Schliissels k auf die Daten gemiiB Funktionsspezifikation - Sicherheitsschnittstelle I +- t Resultat Abb.

10. , Neumann, C. 1. "Kerberos: An Authentication Service for Open Network Systems", MIT Project Athena, 1988. 11. XlOpen Company Ltd. "Generic Security Service Application Programming Interface" Preliminary specification, 1993. 50 "Transaction-Security-System, Programming Guide and Konzept und Realisierung einer allgemeinen Key Management Schnittstelle M. a. untersucht, wie die Anforderungen realer Schliisselmanagement Systeme, insbesondere von verteilten Systemen in das Sicherheitsmanagement integriert werden konnen.

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