The SNC functions are integrated in the SAPsystem components (for example, the AS ABAP system kernel, SAPGUI, or the RFC library) as a layer between the kernel layer and the library provided by an external security product, such as SAP NetWeaver Single Sign-On. See the figure below.
Integration of SNC andan External Security Product in SAP Systems
During this step, the SNC layer uses the functions provided by the external library to process the messages accordingly (for example, to apply encryption). The SNC layer accesses the external library using the GSS-API V2 interface.
All of the components involved in the communication need to use a library that implements the same GSS-API V2 functions. We cannot guarantee interoperability if different components use different security products with different implementations.