If all crypto can only be broken by a machine that can itself only be made by 3 companies all of which are very careful about who they sell to, we get a few governments spying on everyone (including each other), while keeping normal criminal hacking (and insufficiently important governments) locked out.
If all crypto can only be broken by a machine that can itself only be made by 3 companies all of which are very careful about who they sell to, we get a few governments spying on everyone (including each other), while keeping normal criminal hacking (and insufficiently important governments) locked out.