Security Requirements Engineering in Safety-Critical Railway Signalling Networks

Table 1

Examples of identified threats with assigned values for the attacker. FR: foundational requirement, R: resources, K: knowledge, PSL: preliminary security level, LOC: location, TRA: traceability, EXT: extent of damage, SL: security level.

Threat	FR	R	K	PSL	LOC	TRA	EXT	SL
T.SI.Attacker.Malware	SI	3	4	4	0	0	0	4
T.RA.Attacker.DoS	RA	2	2	2	0	0	1	1
T.DC.Attacker.TrafficAnalysis	DC	2	2	2	1	0	1	1