ISASecure and IEC 62443, explained with the numbers
What each certification program actually evaluates, how the security levels and device types change the scope, and where the common points of confusion come from — written by the assessors who run these evaluations.
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IEC 62443 target security levels in ACSSA: the asset owner's level decides what is checked, and nothing is awarded
How ACSSA uses each zone's target security level from the asset owner's IEC 62443-3-2 risk assessment to decide what is checked, and why no level is awarded.
CSA security levels 1 to 4: what each level actually adds
IEC 62443 security levels explained through ISASecure CSA: what SL 1 to SL 4 are built to resist, how many requirements each adds, and how to pick a target.
What ISASecure CSA certification actually evaluates
ISASecure CSA certifies a component against IEC 62443-4-2: 166 functional requirements, four component types, three assessment streams and one security level.
Advanced is SL 4, except when it is SL 3: the ISASecure ICSA tier-to-level trap
ICSA Advanced maps to SL 4 in the functional assessment but to SL 3 in vulnerability testing. Why the mappings diverge and how to read the certificate.
One certificate, several levels: how ISASecure SSA assigns a capability security level per zone
How ISASecure SSA assigns an IEC 62443 capability security level to each zone of a system, why one certificate can carry several levels, and how to specify it.
What ISASecure SSA certification actually evaluates
ISASecure SSA certifies a control system as sold against IEC 62443-3-3, with a capability security level per zone. Four elements, 116 functional rows: the map.
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