Originally posted by ZheShiWO
Iam preaty sure the Americans broke the Japanese military and civilian codes, so how can their spy agencies be impressive ?The Americans knew about Midway after all..
The Japanese had several parallel spy organisations. The military one was divided into at least 4 divisions, 2 under the Imperial Navy and Army general staffs and then another 2 which served under the Military police of respective branch. Then you have the spy organisations run by factions within the army in co-operation with criminal organisations like the Triads and so on. Each of the organisations had their own communication method which meant that cracking one set of codes did not give the full picture. Enough to win the war though.
The Americans AFAIK manage to crack the naval codes and diplomatic codes. No big achievement since both the British and Dutch had done this much earlier. The IJA codes I am not that sure about.
Now even if the Americans did manage to break the Japanese codes, it doesn't mean that the Japanese spying organisation is bad, just that Japanese encryption technology is bad.