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I just love these sorts of conspiracy theories, they provide endless hours
of laughter. It was to be expected Stinnett would make his appearance,
his use of the famed McCollum Memo.

By the way if you really want to have us believe Stinnett is the
authority check out his page 324 of his hardcover edition
where he states "There is no reliable evidence, found by the
author, that establishes how much of the 5 - Num [JN25]
could be deciphered, translated and read by naval cryptographers
in 1941". Now go back and read the book where it assumes,
his opinion, his assumption, the USN could read the signals
Stinnett wants them to have read, including the ones he tries
to pretend were sent by radio instead of hand delivered.
Stinnett has no idea what the USN could read, he simply gives
his opinion.

Stinnett is the man who discovered that truthful answers to Pearl
Harbor controversy secreted in bomb proof vaults,withheld from two
congressional investigations and from American People.
As Late as 1995 the Joint Congressional investigation conducted by
Sen.Thurman and and Rep.Franke was denied access to the Naval storage
vault in Crane, IN
Because of his efforts Naval Security Group Command agreed to transfer
Crane files to National Archieves.
"The Days of Deceipt" is based on what he found in first batch of
released documents.
After the days of deceipt appeared a strange thing happened,NSA
immediately started withdrawing pre Pearl Harbor documents from
Archive II.
As of today almost 30 NSA withdrawal notices guarantee that pre Pearl
Harbor documents discovered in Crane IN will be off limits to American
People and their elected represantatives for another 60 years
Your above mentioned quote from the book refers to percentage of
deciphered japanase messages it might be 30% or might be 100%.
As I said before the book was based on documents found in first batch
of Crane documents released in middle of 90s,and information revealed
in documents astonishing,but crane documents reviewed by Stinnett was
only a minuscule percentage of crane documents,by far not enough to
say something definite about the percentage of Japanase messages
deciphered and translated by US.

The conspiracy here is one where people are paid for telling other
people what they want to hear. The truth is to be ignored, the money
does the talking, be poorer for being lied to and then be unwilling to
admit the mistake, and so make yourself even poorer.

Official Version here is the one where the officials are paid for
telling the public what their bosses want.This is one important
difference.
Another important difference between offical story tellers and
conspiracy loons is the following:Offical story tellers have
priviledge to distort or completely withhold information whereas
conspiracy loons cannot even dream of having such priviledges.

However the really fun thing is the way the fiction in Stinnett is to
be enhanced, by promoting McCollum. No longer is he the Far East
expert in the Office of Naval Intelligence, no he is promoted to the
command of either ONI (Captain or Admiral rank) or the head of
OP-20-GYP, the USN organisation charged with breaking Japanese
codes, it was originally called OP-20-GY.

Also the famed memo never went further than his boss, nowhere
near FDR.
The Famed Memo did not need to go anywhere,it became offical Japan
policy of FDR administration.

By the way if the latest attempt at fiction is to somehow pretend
the USN decryption section did not do the work on "purple" it shows
an even bigger lack of reality. The "purple" work overloaded the
section, slowing down all work. The USN had only one section of
cryptographers and security cleared language experts.

Finally all the IJN documents and survivors agree the force did not
transmit after leaving their usual harbours. See for example the
surviving logs, the 1942 IJN after action report and the post war
interrogations. The idea Yamamoto would be so stupid as to
put his strike force in a harbour that could only be contacted by
radio is a joke.

The Japanese Navy took control over the cable station at Hitokappu
Bay. Also, there was a marine cable between Nemuro, Hokkaido
and Shana, Etorofu in 1941 which was then tied to the telegraph
office at Hitokappu Bay. Source. Recollection of Mr. Hirokazu
Kawguchi of Hachioji City in Tokyo who was born at Shana in
1923 and worked at the Shana cable office.

Next, there was a daily air courier service between Ominato and
Hitokappu Bay to transfer documents received from Tokyo by air
and to send documents to Tokyo by air while the 1st Air Fleet was
at Hitokappu Bay. Source. ?History on Communications? by
Admiral Susumiiro Ishiguru (of Strike Force experience) (Tokyo:
Tokyo Reserve Police Association 1953).


Who told Yamamato that their Naval code was broken?
Even today you can intercept any radio transmission easily,but if you
cannot decode and decipher it,its useless.
Even after Pearl Harbor IJN continued to use the same code because
they were not aware that it was broken.
Radio messages sent with unbroken or unbreakable code is as safe as
courier messages,if not more.