"Gary Drescher" wrote in message
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"kage" wrote in message
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The US broke the Japanese secret code very early in the war. Because of
that it was known that there were many Japanese spies were in the US.

It would have been impossible to round up just the spies, without giving
up the secret that we knew the code. Thus they were all interred. No
other way to do it.

1) What evidence do you have that cracked Japanese codes revealed the
identities of spies? 2) If their identities were known, wouldn't standard
practice have been to feed false information to some, while capturing
others (without disclosing the grounds for suspicion), depending on which
approach was more advantageous in particular instances?

That, in a nutshell, is how they knew for sure they'd broken the code(s).

The US let it be known (in what circles, I'm not sure...probably feeding bad
info to spies...) that Midway was running out of water. Say the Japanese
codeword for water was Alligator and the word for Midway was Lotus.

The US identified a message saying that Lotus was running out of Alligator
so we're going to attack Lotus...BINGO! We knew they were coming.

At least that's the way I've read it was done.

But, I believe the OP is correct in stating that they put a major iron lid
on the fact that we were listening "outside Yamamoto's door."

Jay Beckman
PP-ASEL
Chandler, AZ