Ij-39: IJN’s Naval Decoding

The Imperial Japanese Navy’s (IJN) efforts to decipher enemy codes, particularly during the Pacific War, to gain intelligence on their plans and operations.

Cr. Cryptographic Warfare

The use of codes, ciphers, and other cryptographic methods to protect military communications from enemy interception and decryption. This was a crucial aspect of intelligence gathering and operational security during World War 2.

Cq. Code-Phrases

Secret phrases or codes used by military units to communicate securely, preventing the enemy from understanding their messages.