In the Lizheng Palace, what Li Chengqian, who was chattering, did not know was 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 they were not known.

However, his introduction was not useless, at least Li Er understood what he meant: "You mean to breed a large number of carrier pigeons for information transmission?" ”

"Yes, Father, a lot of information is time-sensitive, and it's good to know even a moment earlier." Li Chengqian simply hated Datang, an era in which communication relied on roaring and transportation depended on walking, and as long as there was a little opportunity for improvement, he would not let it go.

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

"You can encrypt it, find a book, pick out the words that need to be used, mark which page, which line, and which column it is with numbers, and the receiver will check the same book." The simplest and most direct encryption method during the Anti-Japanese War in later generations, Li Chengqian said it without even thinking about it.

Moreover, if it weren't for the fact that Datang used traditional characters, Li Chengqian even planned to memorize a five-stroke root table.

However, what Li Chengqian thought was very simple gave Li Er a big hint, and the old man almost didn't think about it before he asked people to find a book and play with it.

Information encryption in the Tang Dynasty generally used the "Liutao. The "Yin Fu" and "Yin Shu" methods recorded in "Long Tao" are actually not particularly complicated, and it is very easy for people with a heart to decipher them, but there are too few people who know words at that time, and even fewer have read "Liutao", so there is no too much leakage of secrets.

At present, the encryption method based on the codebook proposed by Li Chengqian completely avoids the risk of information leakage, and even if the information is intercepted by someone, without the codebook, it will only get some useless numbers, and the information cannot be deciphered.

With Li Er's wisdom, after fiddling with it for a while, he figured out the door inside, and then looked at Li Chengqian's eyes with a hint of relief, after being the prince for so long, he finally did a serious job.

"Your Majesty, the eldest grandson asks to see you." Li Er piled several books together and was having fun, when an attendant came in to report.

"Mowgli? What is he here for? "Comrade Lao Li was too involved in playing the password game, and the matter of carrier pigeons was completely left behind.

But soon Li Er reacted that the eldest grandson Wuji was here for something, and while instructing the chamberlain to invite the eldest grandson Wuji in, he glanced at Li Chengqian with an indescribable gaze.

"Mowgli, come over here and see the new encryption method that Cheng Qian has come up with."

As soon as the eldest grandson Wuji entered the study, he was called by Li Er's side, but this time the old man was embarrassed to say that the new encryption method was made by himself in front of his son.

After the tea time, after the eldest grandson Wuji thoroughly understood what a codebook was and what a coded code was, he quickly thought of a question: "Your Majesty, if this method is compiled into a separate book, ......."

"Hahaha, yes, Wuji is really wise, and it coincides with me." Li Er smiled very happily, and standing in Li Chengqian's position, he could faintly see the little tongue in the old man's throat trembling.

Sure enough, the upper beam is not right and the lower beam is crooked, Li Chengqian has an innocent smile on his face, and he keeps complaining in his heart, there are shameless subordinates like Cheng Fairy, Li Er, the general of Tiance, how can he not ask how to know, if he hadn't made up a book by himself just now, how could the old man coincide, and what he would have taken coincidence.

"By the way, Mowgli, you only came here because you received a note from me?" After laughing, Li Eryu swept Li Chengqian, and then remembered the matter of the carrier pigeon.

"Yes, Your Majesty." The eldest grandson Wuji took it out in his arms for a long time, and found a crumpled piece of paper, which was the note from Li's second-hand book, but it was crumpled because it needed to be tied to the pigeon's feet.

Li Er took the note from the eldest grandson Wuji's hand, opened it and looked at it carefully, and smashed it on the table with a fist: "Okay, this thing should be of great use!" ”

"Your Majesty, Your Majesty?" The eldest grandson Wuji, who was taken aback by Li Er, looked confused, and couldn't think of what a broken note could be of great use.

Li Er smiled mysteriously and asked the eldest grandson Wuji, "Does Wuji know who sent this note?" ”

"It's a guard beside Cheng Qian, who seems to be called Wang Something." The eldest grandson Wuji thought about it for a long time, but he didn't remember Wang Chenghu's full name.

"Wuji is wrong, this note was sent by a bird." Each came to the new encryption method, and verified that the pigeon can really send letters, and Li Er was in a very good mood.

Looking at the eldest grandson Wuji, who was a little dazed, Li Er asked, "Wuji, can the person who sent the letter come back with you?" ”

"Just wait outside the temple." Eldest Sun Wuji nodded and pointed outside.

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

"This, the minister didn't pay attention to, but it seems that he does have a white thing in his hand." The eldest grandson Wuji recalled and said vaguely.

"That's it, what he is holding is a pigeon, and this note is written and tied to the pigeon's feet......" Li Er, who was in a good mood, did not hesitate to use his own language, and almost re-said Li Chengqian's set of words almost exactly.

"This ......" Li Er's eloquent description made the eldest grandson Wuji stunned (pretending, he must give Lao Li some face), and only after a while did he hesitate and said: "According to what Your Majesty said, this thing is indeed of great use." ”

"Exactly." Lao Li nodded, and glanced at Li Chengqian, who was napping with nothing to do: "The prince ......."

Li Chengqian, who was half-asleep, jumped down from the chair with a clever wit, and said in a daze: "Uh~, the son is here, what does the father command." ”

Li Er also didn't take advantage of this lazy son, sighed and said: "Prince, it's okay for you to be responsible for the cultivation of carrier pigeons, right?" ”

Of course, there is a problem, and Li Chengqian really wants to tell the old man this. But considering the consequences of saying this, the words became: "No, no problem." ”

"That's good, in the future, you will be responsible for the communications department you mentioned." Li Er thought about it for a long time, but he didn't remember what the company Li Chengqian said just now was called.

"Father, it is Datang Mobile Communications Company, referred to as Tang Mobile." Li Chengqian reminded him very doggedly.

"No matter what it's called, I'm going to see the results as soon as possible, you know." Li Er asked with a serious expression.

"Erchen understands that the cultivation work must be completed as soon as possible, but the manpower is ......" Li Er wants the carrier pigeon to do Li Chengqian naturally knows, but because there is no one in his hands, he can only put forward conditions.

As soon as the manpower was mentioned, the old man began to feel distressed again, and after thinking about it, he decisively let Li Chengqian handle the matter of selecting people by himself: "You can handle the manpower yourself, and if you find it, you can go to the Ministry of Officials for the record." ”