Kanji to Morse Code

[CCIP]

http://en.wikipedia.org/wiki/Wabun_code

Basically, they did not use kanji, but relied on kana. Japanese doesn't use only kanji in its writing, but also the parallel katakana/hiragana syllabaries: http://en.wikipedia.org/wiki/Kana

I assume there were rules in the Wabun code to resolve the occasional ambiguities, but otherwise Japanese doesn't really need kanji to be intelligible for military purposes.