Abstrakte Modelle zur Untersuchung yon sieheren Systemen. Ausgehend von Systemen, die sich durch Subjekte, Objekte und die beiden Subjekt-Objekt-Beziehungen ,,Lesen" und ,,Modifizieren" darstellen lassen, wird mittels abstrakter Modelle untersucht, welche Strukturen in einem System m6glich sind, das die Geheimhaltung yon Daten gegen unbefugten Zugriff garantiert. Anhand von Beispielen wird die Beziehung ModeU--Realitgt aufgezeigt.Abstract Models for Examining Secure Systems. By means of abstract models we consider systems, that are represented by subjects, objects and the two subject-object-relations "read" and "modify". The possible structures in a system, that guarantees the privacy of data, are examined. The relation between the models and the real world is shown by some examples.
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