In the Lizheng Hall, Li Chengqian, who was chattering endlessly, didn’t know that in the south of the Tang Dynasty, the use of carrier pigeons had actually begun, but the scale was very small and they were all among the people, so it was unknown.

However, his introduction was not useless. At least Li Er understood what he meant: "What do you mean is to cultivate a large number of carrier pigeons for information transmission?"

"Yes, Father, a lot of information is time-sensitive, and it is even good to know it earlier." Li Chengqian yelled at the Tang Dynasty, the era of communication and transportation, which was simply abhorred. As long as there was a chance of improvement, he would not let it go.

"What if the information is leaked? Have you considered it?" Li Er was fooled by Li Chengqian and forgot the purpose of calling him over, so he began to think about the use of the carrier pigeon.

"You can encrypt it. Find a book, pick out the words you need, use numbers to mark which page, row, and column it is. Will the receiver know after checking the same book?" Li Chengqian said the simplest and most direct encryption method during the War of Resistance in later generations without thinking.

Moreover, if it weren't for the traditional Chinese characters used in the Tang Dynasty, Li Chengqian even planned to memorize the Wubi roots to express it.

However, what Li Chengqian thought was very simple gave Li Er a big reminder. The old man almost thought about it and asked someone to find a book and play with it.

In the Tang Dynasty, information encryption was generally used in the "Six Strategies".

The "Yin Fu" and "Yin Shu" methods recorded in Long Tao are actually not particularly complicated. It is very easy for those who are interested to decipher. However, because there were too few people who knew the words at that time and even fewer people had read "Six Strategies", there was no too much secret leak.

The encryption method based on password books proposed by Li Chengqian now completely avoids the risk of information leakage. Even if the information is intercepted, without a password book, it will only get some useless numbers and cannot decipher the information.

With Li Er's wisdom, after fiddling with him for a while, he figured out the various ways inside. Then he looked at Li Chengqian's eyes and felt a little relieved. After being the prince for so long, he finally did something serious.

"Your Majesty, Lord Changsun is asking for a visit." Li Er was having fun together with several books, and an eunuch came in to report.

"Wuji? What are he here to do?" Comrade Lao Li was too involved in playing password games, and the matter of the pigeon was completely thrown behind.

But Li Er soon realized what Changsun Wuji was here for. While instructing the eunuch to invite Changsun Wuji in, he glanced at Li Chengqian with an indescribable gaze.

"Wuji, come here quickly and see the new encryption method that Chengqian has created."

Changsun Wuji just entered the study and was called by Li Er. However, this time, the old man was embarrassed to say that he had created the new encryption method himself in front of his son.

After a cup of tea, Changsun Wuji completely understood what a codebook was and what encoding was, and he thought of a question every time: "Your Majesty, if this method is to compile a book separately..."

"Hahaha, it's not bad. Wuji is indeed Gao Zhi, it coincides with me." Li Er smiled very happily. Standing in Li Chengqian's position, you could vaguely see the old man's little tongue trembling in his throat.

It turns out that the upper beam is not straight and the lower beam is crooked. Li Chengqian had an innocent smile on his face and kept complaining in his heart. With a shameless subordinate like Cheng Yaojing, the character of General Li Er, the Tiance, can be seen without asking about it. If he had not just mentioned a book, how could the old man have coincided? What could it be like?

"By the way, Wuji, did you come because you received my notes?" After laughing, Li Eryuguang swept over Li Chengqian and then remembered the incident of the carrier pigeon.

"Yes, Your Majesty." Changsun Wuji took a long time in his arms and found a wrinkled piece of paper. It was the note from Li Erzhu. It was just that it had to be tied to the pigeon's feet, so it was wrinkled a little.

Li Er took the note from Changsun Wuji, opened it and looked carefully, and punched it on the table: "Okay, this thing is of great use!"

"Your Majesty, Your Majesty?" Changsun Wuji, who was startled by Li Er, looked confused and couldn't figure out what kind of use a broken note could be used.

Li Er smiled mysteriously and asked Changsun Wuji: "Does Wuji know who gave this note?"

"It's a guard beside Chengqian, and it seems to be named Wang or something." Changsun Wuji thought for a long time, but he never remembered Wang Chenghu's full name.

"Wuji was wrong. This note was given by a bird." After getting a new encryption method, it also verified that the pigeon could really deliver the letter. Li Er was in a very good mood.

Looking at Changsun Wuji who was a little confused, Li Er asked, "Wuji, is the sender back with you?"

"Just wait outside the hall." Changsun Wuji nodded and pointed outside.

"Have you ever seen him holding a white bird?" Li Er continued to ask.

"I didn't pay attention to this, but it seemed that he was indeed holding a white thing in his hand." Changsun Wuji recalled and said vaguely.

"That's it. He was holding a pigeon. I wrote this note and tied it to the pigeon's feet..." Li Er was in a good mood and said Li Chengqian's words in a very good mood almost without hesitation.

"This..." Li Er's vivid description made Changsun Wuji stunned (pretending to give Lao Li some face) and hesitated for a while: "According to what Your Majesty said, this thing is indeed useful."

"That's true." Old Li nodded and glanced at Li Chengqian who was dozing out of nothing and was dozing: "Crown Prince..."

Li Chengqian, who was half asleep and half awake, jumped out of the chair cleverly and said in a daze: "Uh~, my son is here, what are the instructions for my father?"

Li Er also took this lazy son for no reason and sighed and said, "Prince, you can be responsible for the cultivation of carrier pigeons, right?"

Of course there is a problem, Li Chengqian really wants to tell the old man like this. However, considering the consequences of saying this, the words turned to the mouth: "No, there is no problem."

"That's good. In the future, the Communications Department you mentioned will be held responsible." Li Er thought for a long time, but he didn't remember what the company Li Chengqian just mentioned was called.

"Father, he is the Datang Mobile Communications Company, referred to as Tang Mobile for short." Li Chengqian reminded him with great traits.

"No matter what the name is, I want to see the results as soon as possible, do you understand?" Li Er asked with a serious expression.

"My son understands that the cultivation work will be completed as soon as possible, but the manpower is only... "Li Er wants to do a pigeon, Li Chengqian naturally knows what he wants, but he has no one in his hands, so he can only make conditions.

As soon as he mentioned the manpower, the old man began to feel distressed again. After thinking about it, he decisively asked Li Chengqian to deal with the matter of selecting people himself: "You can do it yourself, and find it and go to the Ministry of Personnel to file."
Chapter completed!