"You can't (and hpefully won't) be able to execute your own code there."
You don't have to beat the encryption scheme to executed code. You just need to jail break the signed code. If the code is complex there will be bugs and likely security holes. One sufficiently wide hole is all it takes to jail break a system.
edit: This is an example of breaking in to a jail rather than out of one.
You don't have to beat the encryption scheme to executed code. You just need to jail break the signed code. If the code is complex there will be bugs and likely security holes. One sufficiently wide hole is all it takes to jail break a system.
edit: This is an example of breaking in to a jail rather than out of one.