Tsja, zekerheid is a cognate for security. "Zeker" from Latin "Sēcūrus".

I've never heard anyone use the word "zekerheid" when talking about security. Verzekering, zekering, zekeren. Sure, but those are all pretty ___domain specific. No one hires a "zekerheidsagent" to secure their building, or an expert in "cyber zekerheid".

Ik ben daar ... vrij zeker van.