10. Ninjas Created Secret Languages and Codes
Effective communication was vital for ninjas. To coordinate operations and prevent intelligence leaks, ninja clans developed various ciphers, signals, and coded messages long before modern cryptography. They employed secret languages known as “Ingo,” which were words understood only by authorized individuals within the same group. Additionally, ninjas utilized special codes in letters that only an authorized person could comprehend. These methods ensured secure communication and the success of their missions (japias.jp).
