apanese introduced JN25B in Dec.1940,they
continued to use old random code books for another two months.
This was the one of the biggest ever intel blunders in the history and
you have missed it.Strange,to say at least.

Translation Denyav has replied to the message where I pointed out
what this meant and has now decided to lie about it rather than cope
with replying.

Again you are dodging questions about the most important blunder of Japanese in
WWII,by filling your posts with senseless crap.

Did Japanase continue to use old random JN25 code books for another two months
after introduction of "improved" JN25B version ?

As I posted before,JN25 was a 19th century system,very identical to
the system used by US forces between 1898-1917 and reason why US
phased out this system was very simple;it was insecure.

Translation no proof brought forward, just a wishful thinking.

Strange,You seem to know eveything about US ,but seemingly nothing about a
system which is used by US for twenty years.
BTW methods for cracking JN-25 or its father US system were published in
various journals world wide in 1931.

Churchill pointed out all the messages they intercepted and decoded
were made public just after the wa

If you cannot dodge a question unfortunately you resort to lies.
Check out Grand Alliance,page 598.

"From the end of 1940,the Americans pierced the vital Japanase ciphers,and were
decoding large numbers of their MILITARY and diplomatic messages"

W.Churchill

A hint for you:When Japanase introduced JN25B ?