Based on Snowden's stories you can assume that they went ahead as fbi/CIA national security threat which could mean fast access to isps and using zero days they

Based on Snowden's stories you can assume that they went ahead as fbi/CIA national security threat which could mean fast access to isps and using zero days they do have. If that's not enough and anyone of them is in the USA they do have access Can your wallet be hard to crack? Yes but either use your zero day to get all data including a Password or book a little bit of supercomputer time for brute forcing. They might have linguists available to help out with a dictionary attack. As aluminum foil hat this might have sound in pre Snowden that's how it could have been played out.