CIA documents from the 1940s, such as this declassified biography of Kim Il Sung, annotate the Chinese characters used in Korean names with numeric "Ueda" codes, like this:
Kim Sung-ju is 金成柱 and Kim Il Sung is 金日成, so we can infer that 12380 = 金. But who/what is "Ueda", and where can I find the full list of these character codes?
Disclaimer: Korean is obviously not Japanese, but Korea was under Japanese rule at the time and "Ueda" is almost certainly Japanese. My working hypothesis is that this is some sort of Daijiten-style reference to characters used across China, Japan and Korea.
