"Ding!"

With a soft sound, another text file appeared on the desktop.

After hesitating for a moment, Duan Yun's eyes suddenly lit up after clicking on the text file.

Although Duan Yun couldn't read the text on it, it was obviously a neatly written Russian text!

Obviously, Duan Yun's crack this time has finally succeeded!

Using software, Duan Yun quickly translated this Russian text:

Just as the pear blossoms are blooming all over the world,

The river floats with a soft veil,

Katyusha stood on the handsome shore,

The song is like a bright spring light,

Katyusha stood on the handsome shore, singing like the bright spring light......

This text is very familiar to Duan Yun.

Because this is exactly the famous song called "Katyusha" that was widely circulated during World War II, when the Soviet Red Army was engaged in the Great Patriotic War.

This song played an extraordinary role in that war, and until now, this song is still the most widely circulated music song in the former Soviet Union in the world.

This somewhat made Duan Yun feel a little unexpected, and he was a little puzzled why such a widely circulated famous song would become a cipher text.

But then Duan Yun guessed some clues.

This password was given to him by Guo Haitao, and before that, Guo Haitao must have mastered this encryption method of military passwords.

Guo Haitao is now over 60 years old, in his time, Sino-Soviet relations had a honeymoon period, "Katyusha", a famous song of the former Soviet Union, was very popular in China at that time, and it was basically a well-known famous song.

Thinking about it, Guo Haitao also liked this song very much, so this time he simply compiled this "Katyusha" into a military password and gave it to Duan Yun for decryption, which is logically in the past.

Thinking of this, Duan Yun's heart suddenly felt relieved, and there was an indescribable feeling of relief all over his body.

Compared with other entertainment, cracking the code can obviously bring Duan Yun a greater sense of accomplishment and conquest.

Therefore, Duan Yun decided that he would continue to discuss with Guo Haitao for some password cracking topics for entertainment.

However, Duan Yun wanted to send the answer to this problem to Guo Haitao first to verify whether his answer was correct.

Thinking of this, Duan Yun opened his mailbox, entered the email address that Guo Haitao had left him before, put the sorted out exercise answers and the cracked cipher text into the mailbox attachment, and gently clicked the send button.

After doing all this, Duan Yun closed the computer, got up and stretched, planning to go out and find a restaurant for dinner......

……

At the same time, at the Huaqing University Research Institute in Kyoto, mathematics professor Guo Haitao and his team are carrying out established scientific research projects in the computer room.

Most of the scientific research teams of Huaqing University generally cooperate with some well-known domestic manufacturers to open up various top patent commercial projects, but these projects are only the 'part-time' of these top scientific research teams, and their main business is generally to serve the national scientific research projects.

In the world, any top scientific research results are often given priority to serve the military side of the country, and then as these scientific research projects are eliminated in the military, they are slowly transformed into civilian technology, which is a practice that must be followed in any country.

As a mathematician from a well-known university in China, Guo Haitao is a top expert who has served in the country's military all year round.

The application of mathematics in military is an extremely extensive basic discipline, and cryptography derived from mathematics is the most important discipline in the military field!

There is no doubt about the military importance of communications security, and there are many lessons in history that encryption and decipherment can determine the outcome of a battle, or even the course of an entire war.

Therefore, in any country, military encrypted communication is the top and most top-secret information in this country, and its degree of secrecy has even surpassed the technology and manufacture of strategic nuclear weapons, which can definitely be called the core secret of a country!

And Guo Haitao has been the creator of this core secret in the past 30 years!

Huaxia's military encryption system is very tight, not only in the difficulty of the encryption process, but also in the relevant secrecy measures are surprisingly strict.

According to the secrecy procedures of the last 10 years or so, the keys of the troops are in the hands of full-time confidential staff officers, and these keys can only be obtained by the secret staff officers who go to the secrecy and security department in Kyoto, and they are usually distributed in the form of CD-ROMs.

The key itself is updated every year, which means that the military encryption method is upgraded every year, and the update speed is somewhat frequent, but it is necessary for security reasons.

Every time you change the key, a new encryption method appears, and resetting the encryption method has become the most important work that Guo Haitao has done in the past few decades, which requires a lot of his time, energy and effort.

As a reward for Guo Haitao, the state can give him all the honors and material rewards he can think of as a scientist, including the title of professor at Huaqing University, the special allowance of the State Council, the academician of the National Academy of Sciences, the country's highest science and technology award, and even the reception of three generations of national leaders in a row......

Even in daily life and travel, the military will secretly protect Guo Haitao, in addition to armed bodyguards, there are also first-class medical personnel to ensure the safety of his life.

The above treatment is almost unimaginable in the eyes of ordinary people, which also shows the importance of the country's top scientific research talents.

In the past few decades, Guo Haitao's work has been conscientious, there has never been any omission, and his contribution to national defense is also quite huge.

At present, Guo Haitao is leading the team to do research on a new generation of encryption technology in the computer room, and various tests are also being carried out in an orderly manner.

At this time, the clock in the computer room pointed to 5:30, which was the time to get off work every day.

There are three layers of security measures outside the microcomputer room, the door of the microcomputer room is optical detection to prevent the staff from taking the data files out of the laboratory, the second layer is the monitoring of the staff of the National Security Bureau, responsible for monitoring the work inside the laboratory throughout the process, and the outermost layer is a number of armed police with loaded guns, which are strictly guarded, comparable to the vault of the National Bank!

Guo Haitao has long been accustomed to this strict and almost harsh working environment.

After a routine check-up, Guo Haitao left the laboratory and returned to his home.

Relatively speaking, Guo Haitao's family life is much more relaxed, and his home computer can also freely surf the Internet and send emails, and even visit foreign websites to query information freely.

Naturally, the State Security Bureau also monitors Guo Haitao's computer, but as long as he does not leak secrets, his online behavior is basically unregulated.

And when Guo Haitao opened the computer in his study today and clicked on the mailbox, he saw the email sent to him by Duan Yun at a glance.