The codebook is one of the core secrets of the CIA, with which France can easily eavesdrop on all the military intelligence of the Chinese and successfully translate it.

The early telegraph technology was very primitive, and this completely open source electrical signal was actually very easy to listen to. In fact, human beings borrow the speed of electricity and then design a simple closed system to complete the transmission of information.

Thousands of miles away, Beijing sent a signal to the telegraph network, and the Ryukyu telegraph received the signal and recorded it, and if there was someone on duty in front of the Ryukyu telegraph, he would start recording these passwords of various lengths.

This is the most primitive artificial means, and when the technology goes further in the future, there will be an automatic transceiver device, and the receiver does not need to stay 24 hours a day, but also can record the electrical signal from afar.

This model is fast and efficient, but there is a big problem, that is, the openness of the telegraph network has created a great concern for the secrecy work.

In reality, it is impossible for a telegraph line to have only two interfaces, Beijing and Ryukyu, and what about Kagoshima, Tianjin, Tanggu, and Jiangning, Shanghai, and Jiangning, and there are also countless transceivers waiting for these electrical signals in these places.

That is to say, when Beijing generates a signal, all nodes on the entire telegraph network can actually receive this signal, unless you physically cut it off.

For civil and commercial telegraphs with low secrecy requirements, this problem can be solved as long as the beginning of the electrical signal is encoded, and every region and every telegraph machine has its own code, and after a telegram appears, people can automatically ignore it and jump over as long as they see that the code is not their own.

But the problem of military telegraphs is much more serious, and the great powers have their own intelligence officers, who will listen to the electronic signals sent by some important targets 24 hours a day, and will never miss a single one.

Beijing's military telegram may have just been sent, and there will be more than a dozen spies on this line recording the rhythm of these electric signals of varying lengths.

The civilian codebook is open, and everyone can translate the rhythmic signal sounds of these ticks against the codebook, and then translate them into human language.

This kind of openness is intolerable to the military and intelligence workers, and in order to keep the highly classified codebook open, each country and even each system will develop its own codebook.

DiDi ...... Drip...... What characters do the two short and one long signal rhythms represent? Tsarist Russia has its secrets, Britain has British translations, France has its own comparison table, and the Chinese have their own code books.

The exact same signal rhythm has completely different meanings in the codebooks of different countries, which makes it difficult for the other party to crack it.

In general, the more complex and scientific the codebook is formulated, the higher the degree of secrecy. According to the statistics of the CIA, the current level of cipher editing in Tsarist Russia is the lowest, and they use different Russian letters to mark different electrical signals.

For the layman, of course, this kind of telegram is incomprehensible, but for the Chinese elites who have been influenced by Xiao Letian's new espionage ideas, this kind of secrecy is obviously primitive and backward.

There are 33 letters in Russian, and at first we really couldn't figure out what each letter represented by the electrical signal, but don't forget that the Chinese intelligence officer knows how to eliminate it.

They first let the spies take the initiative to approach some low-level telegrams in a manual way, and if they could decipher a letter, they were one, and so little by little, as more and more letters were deciphered, gradually those telegrams were revealed.

After nearly two years of precipitation, the CIA has now mastered the three sets of cipher compilation tables of Tsarist Russia, and the Tsarist Embassy in Beijing is now transparent to the Chinese, which is the key factor for Xiao Letian to clearly grasp all the intelligence of the expeditionary force.

In the past, Molière did not believe that the Chinese would be so smart, but today when he saw the code book written by the Chinese, this Chinese Tong cried.

He hugged his head and cried like a child, and the three subordinates in the underground fortifications were all stupid, they didn't know what the boss was crazy about.

"I was wrong, we were all wrong! We underestimated the enemy again and again, and as a result, we were played by the Chinese again and again! They are not fools, they are not idiots, they are a group of geniuses!"

"I finally understand why we lost, and the gap in intelligence work has proved that we will definitely lose!"

"This is the Chinese telegraph code book in my hand, they are simply a group of geniuses, their codes are not arranged according to Chinese characters, but by radicals, you can tell me which of us can understand the radicals of Chinese characters?"

"Not only that, but they also use a two-layer password, the first layer uses numbers, and each number represents different book coordinates!"

"Look at this book, now it has been folded to the page of the "Four Books", what does this mean? This shows that today's secret telegram has to find the answer from the book of the Four Books!"

"The number is the number of pages and the number of words per page! The sixth word on the third page...... The first word on page 11...... The fifteenth word on page eight...... You have to find it like this, and then you can summarize it before you can form a sentence!"

The intelligence officers around him were also dumbfounded: "Four books? What kind of book is this? Is it four books? But there are no four books here, where are the books?"

Molière collapsed "woo-woo...... This is the wisdom of the Chinese, he knows that we do not understand Chinese culture, and this is what he bullies, four books are not four books! That is a book, a book that Chinese literati must read!"

"Of course there is no book here, because this kind of book is a classic that Chinese primary school students have to memorize, and those who can't memorize it have to hit the palm of their hands, and the real code book is in the heart of Chinese......"

"Look, today is the Four Books, tomorrow is the Pentateuch...... What is this? Disciple rules? There are also 1,000 characters...... Wait, I have another question in mind......"

Molière slapped his head: "Version! I forgot the version! Different books have different versions, that is to say, the versions are different, and the order of the Chinese characters in each page is also different! If we don't know what version of the four books the Chinese use, then we can't find the final answer!"

"Damn! How do these Chinese have their heads? Why are they so smart? Why didn't we think of it?"

Molière fell into a deep inferiority complex, in fact, this cannot be blamed on him, human beings have only just begun to use telegraph technology on a large scale, the submarine telegraph network to communicate the world has not been built, and the coverage rate of the telegraph system is very low.

This is a completely emerging technology, and now only governments and the military have the strength to play, and it has not been popularized at all. It certainly takes time for something new to emerge and develop, and it varies from country to country.

Xiao Lotian is bullying people, using the password compilation technology of the World War I and World War II era to abuse the intelligence officer in the middle of the 19th century, which is equivalent to a twenty-year-old stick guy bullying a kindergarten student.

Technology aside, the concept determines everything, and a mature concept is enough for him to bully people.