Introduction
1 Scope
2 Normative references
3 Definitions
4 Reference architecture
5 Threats to the transmission system
6 Requirements for defences
   6.1 Introduction
   6.2 General requirements
   6.3 Specific defences
7 Applicability of defences against threats
   7.1 Introduction
   7.2 Threats/defences matrix
   7.3 Choice and use of safety codes and
       cryptographic techniques
Annex A (informative) Guidelines for defences
   A.1 Applications of time stamps
   A.2 Choice and use of safety codes and
       cryptographic techniques
Annex B (informative) Bibliography
Annex C (informative) Guidelines for use of the standard
   C.1 Scope/purpose
   C.2 Classification of transmission systems
   C.3 Procedure
   C.4 Example
Annex D (informative) Threats on open transmission systems
   D.1 System view
   D.2 Derivation of basic message error
   D.3 Threats
   D.4 A possible approach for building a safety case
   D.5 Conclusions