No phone, letters, Ninja how to transfer confidential information?

From the very beginning, one of the ninja's main tasks was to spy. To do this, they are not afraid to disguise themselves in the crowd, even despite the danger of breaking into the source of the information to get what they want.

However, after successfully stealing information, the ninja will have to transfer that information. At that time, there was no telegram, email or phone. So, how will the ninja do it? In fact, they developed a number of ways to transfer information over long distances called Dentatsu-Jutsu .

Encoded as audio

The ultimate goal of Dentasu-Jutsu is to send signals to the teammates. Needless to say, in such cases they would have to 'encode' the information so that only those in the group understood the meaning of the signals.

To do so, the ninja will use visual and visual arousing tools. For example, in the case of fighting on the battlefield, they could use drums and bells, emitting low-pitched sounds, enough for their comrades to hear even in a noisy place. When encountering sea battles, the ninja will use gongs as a signaling tool.

Conch shells are an effective tool for ninja to transfer information.

According to many records, ancient ninjas often disguised as monks in the mountains. In this case, when you need to transfer information, the ninja will use conch shells to blow. At that time, the ninjas will follow the wind on a mountain path and blow out sounds according to the conventions available to their teammates when they receive information.

In addition, rice grains are dyed with 5 different colors or ropes, branches through the arrangement and agreement of the individual ninja together also become effective communication tools. The use of such a combination of seemingly inanimate tools helped the ninjas gain a lot of information when needed.

Signal system

In the case of many ninja working together to transmit important information from remote locations, they often use Semaphore - a signaling system by placing hands or two flags in a certain position to indicate Letters of alphabetical letters to convey.

This method of communication is called Mekiki-no-Koto . Following this unique method of communication, a ninja will climb to the top of a hill and use 2 flags held in 2 hands to send messages to other ninja who are also standing on another hill.

The second ninja after receiving the information from the first ninja will continue to pass the code to the 3rd ninja in the same way. As such, the transmission will be done until the information reaches the destination. In this case, how far the information will be transferred will depend on the number of ninja.

In this method of communication, a lot of information can be transmitted by a certain combination of two flags and the body movements of the sender, similar to the Morse signal system.

In fact, this method can help ninjas convey more than 100 content to teammates. Besides, both the receiver and the sender will be able to exchange information with each other.

This method of communication is said to be quite popular during the Edo period. However, with many ninja who have high dharma body, they can completely transmit information faster by running straight home.

Noroshi beacon system

The application of signaling system to transmit Semaphore can only be applied during the day because only the ninja can see each other's signals. When the night falls, the hilly areas will sink into the darkness, even if the ninja is so sharp, they cannot see the flags or the body movement of their comrades.

At that time, the ninjas will transfer the secret using a gando weapon, acting as a flashlight. The ninjas are masters of weapons use and they are all creative experts, so in this case, they often use light along with a set of codes to convey.

In addition, ninjas also use beacon systems as an effective way to communicate.

In Japanese, the beacon called 'noroshi' itself from the noroshi means the smoke of the wolves. The reason for this is because the feces of wolves used to make smoke, based on the characteristics of the Japanese wolf dog feces, burn smoke directly into the sky.

In the day or in the evening, there are many houses burning fire to cook rice or heat. However, smoke coming from such houses often follows an angle. So smoke from wolves becomes very useful in signaling because the smoke will rise vertically.

The use of this smoke is often effective in the range of 40 to 80km, which is farther than the semaphore signal system.

However, compared to the semaphore, the weakness of this communication method is that a lot of information cannot be transmitted and the signals are always one-way information. Currently, Japanese wolves are also extinct, so recreating this method of transmission is also difficult to implement.

Wood card 'Warifu'

Warifu is a small wooden board cut into two equal parts.

Although the ninja succeeded in stealing confidential information from the enemy, the exchange of information would only be considered complete when the information reached the lord the ninja served. However, even when believing that it was needed, there was still a problem, which was the ability of the ninja to exchange information that the opponent had installed.

This usually happens during the Warring States period, when the Daimyo lords deliberately transferred false information to rival Daimyo. In this case, the ninja under the command of a murdered lord and a rival faction ninja will be sent to replace the destroyed ninja to transmit false signals. Therefore, the identity verification is indispensable to the ninja.

To verify the information, the ninja used a variety of methods, including the method of confirming the identity called 'Warifu'. Warifu is a small wooden board cut into two equal parts. On the face of a Warifu, people write on a letter before separating it in half.

Each ninja will hold a piece of Warifu with him, when they meet, they need to give one half of Warifu to prove their identity. This is a very simple way to verify identity and is also very effective so it is widely used not only in Japan but also in China and Europe.

The ancient authentication password system has been used to identify.

Currently, computers or websites, the handsets that we use protect our personal information with a password. During the war, people also identified teammates with password systems. The ninja are also not excluded. There are many ways of using passwords that are used by ninjas.

Along with that, the ninja also invented many ways to verify the identity of their comrades, such as setting up 'passwords' to recognize each other.

For example, while in the siege of an enemy, if another ninja seems to be on the same side, the ninjas will read out a certain word, if the other ninja answers correctly from the previous convention, they can recognize each other to avoid bloody confrontation. Passwords used by ninjas are often words related to nature, or compound words of certain special words used in their group .