Infiltration is the skill of getting into places you’re not supposed to with practised skill and knowledge.
Strength
The Strength Infiltrate skill represents a character carefully breaking an object with their might to allow them access, kicking a locked door at the lock so the lock shatters, targeting the hinges on a treasure chest. It is a careful application of might.
Dexterity
The Dexterity Infiltrate skill represents getting into a place through finesse and agility, whether that be hiding in shadows to apply stealth or using lockpicks to open doors and disable traps.
Intelligence
The Intelligence Infiltrate skill represents breaking through the security of technical and magical systems, destroying glyphs to access the core of system to change it. Hacking.