TheCodeBreakers
insinuated into the Japanese embassy to ease their cryptanalytic burden.
Of course, even if they had thought about it, they might have rejected the
idea, for discovery of the spy would have meant an automatic change of
codes. The danger of this was much less if the systems were read
through cryptanalysis.
The paper codes of the Japanese consisted of folders whose four or six
pages could be opened into a single long sheet. Embassy Counselor
Sadao Iguchi, who was in charge of the code room, directed telegraph
officer Masana Horiuchi and code clerks Takeshi Kajiwara, Hiroshi Hori,
Juichi Yoshida, Tsukao Kawabata and Kenichiro Kondo in the burning of
the paper codes. Demolition of the code machine was more complicated,
and followed the guidelines transmitted recently by the Foreign Office.
The machines were dismantled with a screwdriver, hammered into
unrecognizability, and then dissolved in acid from the naval attache's
annaabi.ee 
