3KS was EVVA’s first reversible key system. The unlocking authorisation is verified using three curves. Another innovative highlight: 3KS features a springless pin function. This makes the system resistant [...] resistant to impact picking attempts. 3KS is also very resistant to wear, easy to use and thus ideal for large-scale locking systems. The first EVVA order involving 3KS came from Berlin Cathedral: German [...] over the symbolic golden key in a ceremony. From 2007, the curve locking system, also available as 3KS plus , was further refined.

managed from the Belgian branch since 2016. The French and Belgians' favourite EVVA products are 3KS plus and 4KS.