We trade "freedom" for "security" every day; it's called civilization
If you're trading freedom for security, you're doing it wrong. They are mutually dependent. You have both or neither, not one or the other.
What does it mean to not be free? It means you can't live your life as you want because someone -- the state, the group with a "monopoly on violence", where one exists -- will use violence to stop you. You don't have security when you are subject to state violence that restricts freedom.
And what is the reason we desire security? Because we can only live as we choose -- we can only live freely -- when others do not violently impose their will upon us. You don't have freedom when you are subject to violence that threatens your security.
The question then becomes, how do we organize to defend ourselves against violence, while at the same time not creating an organization that commits violence? The modern police state fails this challenge.