Create true random keys

[KopfKrieg]

From a paranoid my point of view the code to generate a random key is not safe:

chars = string.ascii_letters + string.digits + string.punctuation
return ''.join(random.choice(chars) for i in range(length))

It's still better than no random key but should be improved as soon as possible. Bad thing: I didn't find a way yet to do this in python. Any ideas?