Seeing how cheaply the KGB compromised FBI and CIA agents, it's probably a price many can reach. You don't need to compromise the key, just fake evidence so as

Seeing how cheaply the KGB compromised FBI and CIA agents, it's probably a price many can reach. You don't need to compromise the key, just fake evidence so as to put the target under suspicion and get it decrypted. They must often chase down false leads, so this might be rather unnoticeable.