Dialect Japanese, also called Japanese dialect.

This is the core problem of the current pair of diplomatic cipher text deciphering work. Although the substitution code encryption mechanism is complicated, there are traces to follow. Frequency analysis attacks can be used. However, the current situation is that this Japanese dialect is difficult to work on.

Hua Luogeng knew Japanese. Not only did he understand it, but he was also proficient in it. He taught himself German, French, Russian, and Japanese foreign languages ​​during his time at Cambridge University. However, he learned Japanese official Japanese, and it was difficult to deal with this Japanese dialect.

Substitution code and language code are one of the main encryption methods in current cryptography. Language code is based on and higher than replacement code. Even if the replacement code is deciphered, the unintelligible language itself is a kind of encryption, allowing a third party to decipher it.

It is difficult for the reader to know the true content of the ciphertext.

The substitution secret consists of single-letter substitution and multi-letter substitution, and is divided into plain text and cipher text.

The principle of single-letter substitution encryption is that each character in the plaintext corresponds to another character in the ciphertext, and the receiver can restore the plaintext by performing reverse substitution on the ciphertext.

The principle of multi-letter substitution encryption is like a matryoshka doll, where plaintext corresponds to ciphertext 1, ciphertext 1 characters correspond to ciphertext 2, ciphertext 2 corresponds to ciphertext 3... until the ciphertext n is limited by the final timeliness of the password.

"In addition to solving dialect Japanese, if we use frequency attacks, I also need manpower. Unfortunately, the students in the Department of Mathematics cannot use them." Hua Luogeng took a puff of cigarette, exhaled white smoke, frowned, and thought carefully about frequency analysis attacks.

As a mathematician, he is very familiar with this method. He even has his own frequency analysis attack method.

Every mathematician is essentially a code-breaking expert.

According to the information given by the Secret Service, the cryptographic system currently used by Japan's diplomacy and military is called red secret. It is an upgrade from the original green secret system. If you want to crack the pile of diplomatic ciphers in front of you, or even the entire set of red secret

The system must solve two problems——

First, understand the meaning of this Japanese dialect itself.

Second, manpower.

Thinking of this, Hua Luogeng stood up and walked towards the door.

"Squeak!" The door opened gently.

"Sir, how are you?" Zhang Zizhong stood outside the door with a look of anticipation on his face.

There were two people standing next to him, one middle-aged and one young, wearing suits, both looking at Hua Luogeng.

"The red secret system uses a language code for Japanese dialects. I don't know which dialect in Japan this is. You have to find it. You can start with popular Japanese dialects, such as Kyoto, Tokyo, Hokkaido, Osaka and other regions, Peking City and Zhutun.

Most of the Japanese military personnel are from the above-mentioned areas, but it is difficult."

Hua Luogeng nodded towards Zhang Zizhong and two men from the Secret Service and said.

"Thank you, thank you very much, Professor Hua. Your words are enough. We are not afraid of difficulties, but we are afraid of not having a direction." After hearing Hua Luogeng's words, the middle-aged man at the head was stunned for a moment, with excitement on his face.

For the first time, I realized the power of mathematicians.

difficulty?

They are not afraid.

What they fear is having no direction.

The work of deciphering the red secret system has troubled the entire Secret Service for several months. They have used almost all kinds of methods, but still have achieved nothing.

They had no idea about this cryptographic system that used the latest encryption mechanism. The Secret Service only knew that this cryptographic system was called Red Secret, and that it used replacement codes and language codes. Other than that, there was no directional gain.

For the intelligence agencies lurking in the dark, the lack of direction to decipher the ciphertext is the most terrifying thing.

I found Hua Luogeng today and unexpectedly gave me directional advice in just one morning.

This made the middle-aged man extremely excited. Apart from being excited, he also felt a sense of... suppression from his IQ.

Hua Luogeng shook his head: "Don't thank me yet. There is still a problem that needs to be solved. I need manpower. The next frequency analysis attack workload is huge. It will take at least 3 months by myself. In terms of the timeliness of the ciphertext,

In other words, this is a failed decipherment."

The timeliness of ciphertext is extremely critical. Unless it is a campaign or strategic-level high-level military intelligence that often spans several months or even years, generally speaking, the timeliness of information such as Japanese troop mobilization and diplomatic exchanges is basically within three days.

Less than a few hours.

It would take more than three months to decipher a piece of intelligence that the Japanese garrison mobilized a regiment to Tianjin...

It's better not to crack it.

Three months is enough for this unit to fight to Taiyuan.

"Professor Hua, please tell me what manpower you need." Upon hearing this, the middle-aged man immediately became energetic. Their department lacks everything, but the most important thing is people.

"My requirements are not high. There should be at least ten people who have received systematic advanced mathematics and cryptography education. Of course, the more the better." Hua Luogeng looked at the middle-aged man and said.

Ten received advanced education in mathematics and cryptography, and Hua Luogeng was able to complete the deciphering work within a month.

There are not many soldiers but good ones...

Well, if it weren't for the scarcity of such talents in China, Hua Luogeng would have wanted 100 or even 1,000. At Cambridge University, he heard his master Hardy say that, like code-breaking work, the more people there are, the higher the efficiency and the shorter the time.

.

silence.

The room suddenly became quiet.

When Zhang Zizhong heard this, he shook his head. The sworn middle-aged man's face froze, and the corners of the young man's mouth twitched slightly.

Is this not demanding?

"Professor Hua, we... don't have this kind of talent, not even one." The middle-aged man shook his head and said truthfully. The Secret Service is full of talents. There are as many people who are proficient in murder and arson as there are crucian carp across the river, but they have received systematic training.

Those with higher education in mathematics and cryptography are zero.

There really isn't any.

"I didn't ask your department to give it. What I meant was that you go find mathematics professors from other universities, such as Peking University, Nankai University, or even National Central University, and gather ten top mathematics talents to establish a dedicated password cracking group." Hua Luogeng sighed.

I breathed a sigh of relief, what he said was so simple, these people are as stupid as college students.

"Professor Hua, you don't know something. Many university professors in China look down on our department. There are also some professors who are unwilling to serve the country and don't want to apply their knowledge to war. No, they are... people like us living in dark corners.

People." The middle-aged man's face showed a hint of helplessness.

"You are the first professor who agrees to help us."

Not wanting to serve the country is the idea of ​​some university professors. Different camps have different attitudes.

This is the belief of a considerable number of university professors who do not want to apply their knowledge to war.

"A group of pedantic people who think they are noble and great!" Hua Luogeng fell into silence after hearing this. After thinking about it, he couldn't help but cursed.

Don’t you want to apply your knowledge to war?

This is not a war for others, but a war of life and death for your own country!

Hua Luogeng loved peace, but he was by no means a pacifist. He always repaid kindness with kindness and revenge with hatred.

When guests come to the door, they sweep the couch to greet them and entertain them with tea and wine.

A jackal comes to the door, closes the door, and entertains them with shotguns.

Treat your friends as warm as spring, and treat your enemies as cruel and ruthless as winter!

The room fell into silence.

"In this case, I will find a way to deal with the talent issue. You should try your best to find other university professors. One of them is one. General Zhang, can you help find it? We will all work together at the same time and strive to crack the red secret in the shortest possible time!

"Just when the atmosphere in the room was stagnant, Hua Luogeng suddenly spoke.

"good."

…

The first-month quiz in early March was a big event for the teachers and students of the school. Yu Hua, who scored 698 points, gained fame and honors and became an idol among the students. Many people gave him the name "Yu Shen"

title.

In order to show their admiration for Yu Hua, many sophomore and first-year students in high school purchased Qiming lighting sources through Cao Wei and Cheng Youping. The sales of Qiming lighting sources were booming, with the order quantity reaching 48 units, almost one for each dormitory.

The degree of Taiwan.

Regarding this situation, Yu Hua had to lament that modern thinking was not applicable to the Republic of China, and the hunger marketing strategy he formulated was declared dead in a sense.

There is no other way. The ultimate goal of Hungry Marketing is to sell more products. However, the No. 4 Middle School market was suddenly occupied by Yu Hua. Who would Hungry sell to?

After accepting this wave of orders, Qiming Light Source is no longer accepting external orders.

For Qiming brand light sources, Yu Hua has no long-term plan. If he can occupy the market of the No. 4 middle school student group, he has achieved his original goal and does not need to invest too much energy again.

However, the Qiming brand light source is not just the end, but the beginning. With the saying "The secret of Yu Shen's good mathematics lies in the arithmetic problem set" spread from nowhere on campus, plus someone on Lin Wan's desk

I discovered a math problem book full of notes. Suddenly, Zhang's third version of the math problem book instantly became a hit among the entire student group and became a book that was crazily sought after by the entire No. 4 Middle School student.

The number of pages full of sincerity, the carefully selected difficult question types, the detailed and meticulous problem-solving process, the unique problem-solving ideas, coupled with Yu Hua's reputation and Lin Wan, the second endorser in the school, Zhang Sanban Mathematics

The question set quickly captured the hearts of all students in No. 4 Middle School.

The science students were tortured by the difficult questions and were in a state of ecstasy. The arts students with poor arithmetic skills were even more confused. They felt that it was extremely profound, but as long as they followed the problem-solving ideas of each question in the question set, they would be able to solve the problem.

I can understand the mystery, and finally realize it, and I have to say something powerful.

It's like this all the way up to the third year of senior high school and down to the first year of senior high school.

Soon, Zhang San's name became famous throughout the No. 4 Middle School.

The popularity of Zhang San's arithmetic problem book was expected by Yu Hua. In order to avoid exposing himself and Zhang San, Yu Hua decided not to sell the arithmetic problem book in person. He specifically changed the sales plan and asked Xu Rui to place it at the entrance of the Fourth Middle School.

We started selling it at the booth and contacted Huangchenggen Bookstore to print 500 more copies and seize the market as soon as possible according to the original plan.

In the class, Yu Hua's identity and status have fundamentally changed due to his first-month quiz score, which was 698. This is a height that everyone in the science class can only look up to, surpassing Zhao Anyuan, who was once the number one in the class, by 63 points.

Although the seat position has not changed, Yu Hua, sitting in seat No. 14, is the uncrowned emperor in the hearts of everyone in the Neo-Confucian class.
To be continued...