OSI security functions are concerned only with those visible aspects of a communications path which permit end systems to achieve the secure transfer of information between them. The definition of security services needed to support such additional security measures is outside the scope of this standard. These measures apply in various application contexts. Additional security measures may be needed in endsystems, installations and organizations. In addition, the architectural relationships of the security services and mechanisms to the Basic Reference Model have been identified. Basic security services and mechanisms and their appropriate placement have been identified for all layers of the Basic Reference Model. This part of ISO 7498 extends the field of application of ISO 7498, to cover secure communications between open systems. Scope and field of application This part of ISO 7498: a) provides a general description of security services and related mechanisms, which may be provided by the Reference Model and b) defines the positions within the Reference Model where the services and mechanisms may be provided. Two case-control studies were conducted among healthy and inpatient psychotherapy samples. Patients were suffering from depressive disorders. In the first study ( N = 296) we used a German short form of the Center for Epidemiologic Studies-Depression Scale (CES-D) for screening purposes. Based on Rasch model analyses, the item-person maps showed that both instruments are suitable to assess depressive mood in healthy and patient samples. In the second study ( N = 154) we used the trait scale of the State-Trait Depression Scales (STDS-T). This part of ISO 7498 adds to the concepts and principles defined in ISO 7498.Īllgemeine depressionsskala ads pdf to excel. Basic Reference Model - Part 2: Security Architecture. This multi- partite standard defines the OSI reference model, describing an architecture to secure network communications through security services (access control, authentication, data integrity, data confidentiality and non- repudiation) and security mechanisms (encipherment, digital signature, access control, data integrity, authentication exchange, traffic padding, routing control and notarization).
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