This is reasonably secure - at least, provided you aren't including user-provided data in your class definition - but it's also fairly pointless. Ruby is a highly dynamic and flexible language that allows you to define classes dynamically without writing them to separate files at all.

Skip creating new files - if you want a new class, you can just call Class.new, like this:

class DynamicClass
  Dynamic2Class = Class.new do
    puts "Hello from the other side"
  end
end

Of course, in reality you'd do something more useful with dynamically-generated classes, but this basic approach will work.