Surveillance only works when people believe their communications are private and secure. The 3rd party was probably NSA and they did not intervene up until bec

Surveillance only works when people believe their communications are private and secure. The 3rd party was probably NSA and they did not intervene up until because it would reveal the existence of a cracking technique. What changed is that weighed against a possible court verdict that would tell every terrorist that no U.S. made device or encryption could possibly be secure, (causing targets to avoid using broken crypto) revealing the existence of a possible forensic technique was low risk. The belief that it is possible to communicate securely is the most important thing for spies to maintain. The FBI wants to discourage people from believing it because they think it will make people less likely to commit crimes. The spies want to encourage the belief because it ensures they can collect the intelligence they need to maintain the status quo.