Mathematics and War in Japan

Abstract

The first, shorter part of the article describes the anti-war movement among Japanese mathematicians during the Vietnam War. In the second, longer part, the author decribes the decoding program of the Japanese Army during World War II, in which he worked himself as a drafted soldier, at the defeat, all written evidence regarding this program and its collaborators was destroyed. Today, the only surviving participant in the project apart from the author is Commander KAMAGA its initiator and leader (alias KATO Masataka, his pen name as a cryptographic author).