4 Identification Challenge Though there are ancient ways for identifying marks, passwords, and certificates, unless you invent new ones and rotate them, the enemy will manage to infiltrate by having similar fake ones.

During a night attack, you may have the enemy follow you and get into the ranks of your allies. To prevent this, have a prearranged policy—a way to identify your allies.

—Yoshimori Hyakushu #27

Imagine the following historical scenario: after dispatching a large group of troops on a night raid, a military commander must open the gates to allow them back inside their fortification. Night raids helped win battles, but they also presented opportunities for a counterattack. An enemy shinobi could forge or steal a uniform from the ...

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