Were the japanese army codes secure

TLDR: The narrative analyzes Allied cryptanalysts'-accomplishments against these multiple Japanese systems and evaluates reasons for their success or failure, concluding with an assessment of the overall effectiveness of the precautions taken by the Japanese Army to render its encoded military radio messages unreadable.

Abstract: This essay describes various Imperial Japanese Army code and cipher systems used during World War II. Relying on Japanese and English language sources, it explains the multiple encryption methods employed by the Japanese to achieve radio communications' security. The article identifies specific characteristics of diverse Japanese code systems including the major army and army air force, water transport, military attache, air-ground, weather, and tactical systems. The narrative analyzes Allied cryptanalysts'-accomplishments against these multiple Japanese systems and evaluates reasons for their success or failure. It concludes with an assessment of the overall effectiveness of the precautions taken by the Japanese Army to render its encoded military radio messages unreadable.