my scientific age

Chapter 99 Dig Yue Erlang?

Dialect Japanese, also known as Japanese dialect.

This is the core problem of the current diplomatic ciphertext deciphering work. Although the replacement code encryption mechanism is complicated, there are traces to follow. Frequency analysis attacks can be used, but the current situation is that this Japanese dialect is difficult to handle.

Hua Luogeng understands Japanese. He not only understands but is proficient. He taught himself German, French, Russian and Japanese foreign languages ​​during his time at Cambridge University.

Substitution code and language code are one of the main encryption methods in current cryptography. The language code is based on and higher than the substitution code. Even if the substitution code is deciphered, the incomprehensible language itself is a kind of encryption, so that the third party can decipher it. It is difficult for the reader to know the true content of the ciphertext.

The replacement cipher consists of single-letter replacement and multi-letter replacement, and is divided into plaintext and ciphertext.

The principle of single-letter replacement 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 replacement of the ciphertext.

The principle of multi-letter replacement encryption is nesting dolls, plaintext corresponds to ciphertext 1, ciphertext 1 character corresponds to ciphertext 2, ciphertext 2 corresponds to ciphertext 3... until the ciphertext n that is limited by the final validity of the password.

"In addition to solving the dialect Japanese, if I use the frequency attack, I also need manpower. Unfortunately, those students in the Department of Mathematics are unusable." Hua Luogeng took a cigarette, exhaled white smoke, frowned, and thought carefully about the frequency analysis attack. As a mathematician, the familiar can no longer be familiar, and he even has his own set of frequency analysis attack methods.

Every mathematician is essentially a codebreaker.

According to the information given by the Secret Service, the cipher system currently used by the Japanese diplomacy and military is called Red Secret, which is an upgrade from the original Green Secret system. It is intended to decipher the pile of diplomatic ciphertexts in front of us, or even the entire set of Red Secrets. The system must solve two problems -

First, understand the meaning of the 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, who was standing outside the door, looked expectant.

There were two people standing next to them, one middle-aged and the other young, wearing suits, and their eyes also turned to Hua Luogeng.

"The language code used in the Red Secret system is the Japanese dialect. I don't know where in Japan this dialect is. You must find it. You can start with popular Japanese dialects, such as Kyoto, Tokyo, Hokkaido, Osaka and other areas, Peiping City and Zhutun. Most of the military and Japanese personnel are from the above-mentioned areas, but it is difficult.”

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

"Thank you, thank you very much, Professor Hua, it is enough to have your words. We are not afraid of difficulties, but we are afraid that we will have no direction." Hearing Hua Luogeng's words, the middle-aged man headed was stunned for a moment, his face full of excitement, the first This time I realized the power of mathematicians.

difficulty?

They are not afraid.

They are afraid of having no direction.

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

I don't know anything about this cryptographic system that uses the latest encryption mechanism. The Secret Service only knows that this cryptographic system is called Red Secret, which uses replacement codes and language codes. Other than that, there is no directional gain.

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

I found Hua Luogeng today, but I didn't expect to give a directional opinion in one morning.

This made the middle-aged man extremely excited. In addition to being excited, he also felt a surge of IQ... suppression.

Hua Luogeng shook his head: "Don't say thank you first, there is one more problem to be solved, I need manpower, and the next frequency analysis and attack workload is huge, and it will take at least 3 months for me to rely on myself. Speaking of which, it's a failed decipherment."

The timeliness of ciphertext is extremely critical, unless the time span of several months, or even several years of high-level military intelligence or strategic-level military intelligence, in general, the Japanese army troop movements and diplomatic exchanges and other information, the timeliness is basically three days In less than a few hours.

It would take more than three months to decipher a piece of intelligence that the Japanese garrisoned troops mobilized a wing to Tianjin...

Better not break it.

Three months is enough for this alliance to reach Taiyuan.

"Professor Hua, what kind of manpower do you need, please tell me." The middle-aged man immediately regained his spirits when he heard it. Their department lacked everything, but most people.

"My requirements are not high. There are 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 too many soldiers...

Well, if it weren't for the scarcity of such talents in China, Hua Luogeng was going to ask for 100, or even 1000. At Cambridge University, he heard Master Hardy say that, like code-breaking work, the more people there are, the more efficient it is and the shorter the time. .

silence.

The room fell silent in an instant.

When Zhang Zizhong heard this, he shook his head at the time. The middle-aged man who had sworn oath froze, and the corner of the young man's mouth twitched slightly.

Is this not too demanding?

"Professor Hua, we... don't have this kind of talent, not even one." The middle-aged man shook his head and said truthfully, there are many talented Secret Service officers who are proficient in murder and arsonist, but they have received systematic Those with advanced mathematics and cryptography education, zero.

There really isn't one.

"I didn't ask your department to give it. What I mean is, you can find professors in mathematics departments of other universities, such as Peking University, Nankai University, or even National Central University, and gather enough top ten mathematics talents to establish a special password cracking team." Hua Luogeng sighed. With a sigh of relief, his words are so simple, these people are as stupid as college students.

"Professor Hua, what do you know? Many university professors in China look down on our department, and some professors are unwilling to serve the country and apply their knowledge to war, no, yes... like us living in a dark corner people." The middle-aged man's face showed a hint of helplessness.

"You are the first professor who is willing to promise to help us."

Unwillingness to play for the country is the idea of ​​some university professors, with different camps and different attitudes.

Unwillingness to apply their knowledge to warfare is the belief of a considerable number of university professors.

"A group of pedantic people who claim to be lofty and great!" Hua Luogeng fell into silence when he heard this, thinking about it, and couldn't help but scolded.

Don't want to apply your knowledge to war?
This is not a war for others, but a war for the life and death of one's own country!
Hua Luogeng loves peace, but he is by no means a pacifist.

When guests come to the door, they are greeted by sweeping the couch and entertained with tea and wine.

There are jackals at the door, closed doors, and shotguns.

Treat your friends as warm as spring, treat your enemies as cruel and ruthless as winter!
The room fell silent.

"In this way, I will find a way for talents. You should try to find other university professors, if there is one, General Zhang, can you please help to find it, we are all at the same time, and strive to crack the red secret in the shortest time! "Just when the atmosphere in the room was stagnant, Hua Luogeng suddenly said.

"it is good."

……

The first-month quiz at the beginning of March was a major event for the teachers and students of the school. Yu Hua, who scored 698 points, gained fame and honor and became an idol among the students. title.

In order to express their admiration for Yu Hua, many students in the second and first year of high school purchased Qiming brand lighting sources through channels such as Cao Wei and Cheng You. degree of platform.

Regarding this situation, Yu Hua had to sigh that modern thinking was not suitable for the period of 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 hunger marketing is to sell more products, but the No. [-] Middle School market was suddenly filled by Yu Hua, so who else would you sell to?
After accepting this wave of orders, Qiming brand lamps are not placed in external orders.

For the Qiming brand light source, Yu Hua has no long-term plan. If he can occupy the market of No. [-] middle school students, he has already achieved the original goal, and he does not need to invest too much energy again.

However, the light source of Qiming brand is not just the end, but the beginning. With the words "The secret of Yushen's good mathematics lies in the set of arithmetic problems" that came out of nowhere on the campus, and there was someone on Lin Wan's desk I found a set of math problems full of notes. Suddenly, the third edition of Zhang's math problem set exploded the entire student group and became a book that was wildly sought after by the entire No. [-] middle school students.

The number of pages full of sincerity, the highly difficult question types that have been carefully selected, the detailed and meticulous problem-solving process, the unique problem-solving idea, coupled with Yu Hua's fame and Lin Wan, the second endorsement of the school, Zhang's third edition of arithmetic The question set captured the hearts and minds of all the students of No. [-] Middle School with great speed.

Science students are devastated by difficult questions, and they want to die. Literature students with poor math skills are even more confused and feel very esoteric, but as long as they follow the problem-solving ideas of each question in the question set, they will be able to I can understand the mystery, and finally realized it, and I have to send a powerful sentence.

Up to the third year of high school, down to the first year of high school, and so on.

Soon, Zhang San's name became famous in the entire No. [-] middle school.

Yu Hua expected the explosion of Zhang San's arithmetic problem set. In order to avoid the exposure of himself and Zhang San's vests, Yu Hua decided not to sell the arithmetic problem set in person. It was sold at the booth and contacted Huangchenggen Bookstore to print another 500 copies, so as to seize the market as soon as possible according to the original plan.

In the class, Yu Hua's identity and status have fundamentally changed because of the first month's quiz score, 698 points, which is a height that everyone in the science class can only look up to, surpassing the 63 points of Zhao Anyuan, who used to be the first in the class.

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.

Interestingly, Fang Yu, who finally surpassed Zhao Anyuan by 1 point this time, is still the second child of Wannian.

With the popularity of Zhang's third edition of arithmetic problem sets, the basic staff of the first class of science is one book. Most of the students in the class are either in the arithmetic problem sets or on the way to read the arithmetic problem sets, and they are reduced to the third in the class and the fourth in the whole school. Zhao Anyuan, except for class time, he spends all his spare time doing questions.

For ordinary students, the most important thing in the math problem set is the problem-solving idea, and for the top students, the most important thing in the math problem set is a large number of exercises.

There are hundreds of question sets in the whole question set, which is tantamount to a math and learning question bank, which can make people keep brushing and brushing, thereby improving their grades.

Tan Qing, who scored 71 in the math exam this time, is the best example of how to improve his grades by brushing the questions. The fact that Yu Hua tutored Tan Qing in his studies quickly spread to the whole class.

Tan Qing is a typical example of questioning tactics. Zhao Anyuan immediately followed, bringing the wind of brushing questions. Fang Yu followed closely. The top students such as monitor Li Fan and Liu Tao did not hesitate. The rest of the students were influenced by the top students. In order to improve Results, have to start the sea tactics.

All of a sudden, the entire first class of science changed from the empty situation at noon. All the students had eaten and immediately returned to the classroom to write the questions. The atmosphere of the first class of science continued to the second class of science, and then to the first class of science, and after a while, In the entire No. [-] middle school, a brand new style of tactical tactics began.

The students in each class discovered the abnormality of the students at the same time. After a careful understanding, they came to know the new set of math problems. After the inspection of the three math masters Luo Wenguang, Tao Ran and Zhu Sui, it was confirmed that the set of math problems was beneficial to the students without any harm. , The math problem set is officially recognized by the school to some extent.

Under such circumstances, the sales of arithmetic problem sets became more and more popular. In less than five days, most of the second batch of [-] arithmetic problem sets were sold. At the same time, the wind of arithmetic problem sets also spread from No. [-] Middle School to other students. spread.

There are girls' high schools, Catholic church schools, and Chongde middle schools far away. There are nearly ten schools of various sizes.

The area where No. [-] Middle School is located is itself a school gathering area. Most of the middle schools, professional schools and normal colleges in Beiping City are located here, and the market potential of teaching and training materials is profound.

Chongde Middle School.

"Jiaxian, come and come, look at what I bought." The young Yang Zhenning was excited, ran into the classroom with two math problem sets in his arms, and shouted when he saw Jiaxian who was studying at the desk in the first row. run.

The teenager Jiaxian, who was interrupted in his studies, looked up helplessly. He didn't like being interrupted in his studies. In addition, it was in the second semester of the first grade and he was busy with his studies. However, it was his friend Yang Zhenning.

Putting down the pen, he turned his eyes to the excited Yang Zhenning in front of him. The young Jia rubbed his eyes and asked, "Zhenning, what did you buy?"

"Recently, the very hot math problem set, all the top students at Peking No. 698 Middle School are using this, especially the Yu Shen who scored 2 points in the exam. Listening to people, this is the secret of his excellent math. I finally bought it. When the two books arrive, I will give you one." The young Yang Zhenning took out a set of arithmetic problems and put it on the desk and explained.

"Listen to people, do you believe it? It's nothing more than the bragging words of those small printing workshops." The young Jiaxian sighed and shook his head helplessly. His friend is good at everything, but he has a flaw. He likes to follow suit and be fooled.

Yu Hua, the student of Peiping No. 698 Middle School, who scored [-] points in the first month's quiz, he knows, but does his high score come from a collection of so-called math questions?

impossible.

He used to like to buy books from stalls at the school gate. He originally thought that he could learn knowledge and expand his horizons, but he never thought that the quality of these stall books could not be improved at all.

He has suffered enough losses, and he no longer believes in such so-called listening to people and books on the street.

Dangdang is different every day.

"Hey, Jiaxian, this time is different, you will know after reading the question set." The young Yang Zhenning smiled.

"Okay..." The young Jiaxian shook his head, picked up the brand-new math problem set that smelled like a book, glanced at the cover and thickness, and felt different. The workmanship of this problem set is much better than any pirated book in the past.

With a hint of interest, the young Jia first turned to the first page, and he saw a series of function questions.

The young Jiaxian frowned slightly, turned his attention to the first function question, glanced at it, and gave an evaluation.

Moderate difficulty.

This is a relatively simple function problem for senior three students, but it is moderately difficult for junior Jiaxian in junior high school, and it takes a certain amount of time to solve.

After reading the question, the young Jiaxian silently calculated in his mind, but for the time being, he had no clue, and turned his attention to the problem-solving process. Soon, a detailed and meticulous problem-solving process appeared, which made the whole person suddenly enlightened.

This question turned out to be so.

Juvenile Jia first watched the problem-solving process, with a clear understanding in his heart, and moved his eyes downward. He originally thought it was the second problem, but as a result, the solution to the first math problem appeared.

Problem solving ideas?

The young Jiaxian was slightly puzzled, and continued to read. After reading the problem-solving ideas, he immediately understood why this problem was done, and what knowledge points it tested.

Fun and interesting.

After reading the first question, the young Jia first looked at the second question, and quickly became immersed in it. With the help of one after another, he quickly understood the mathematical knowledge points he did not understand.

I don't know how long it took, suddenly, the young Jiaxian felt someone poke his arm, raised his somewhat ignorant head, and standing in front of him was his friend Yang Zhenning.

"Jiaxian, how do you feel after watching it for 10 minutes? If it's not good, give it back to me." The boy Yang Zhenning squeezed his eyes, looked at the confused boy Jiaxian, and teased.

return?
The young Jiaxian hurriedly embraced the set of math problems in his arms and treated it like a treasure. He glanced at his friend and took a deep breath: "This book... is of great value! Zhenning, how did you get it?"

"I snatched it from a boy's stall. There were very few books and a lot of classmates. You don't know. At that time, I spent a lot of effort to grab one, and I was about to leave when I suddenly remembered that you didn't have it yet. Go back and grab the second book." The young Yang Zhenning responded, telling his real book buying experience.

"Zhenning, thank you, I owe you a favor." The young Jiaxian heard this and was moved. He didn't mention the money, but said quite solemnly.

owe a favor.

This is the value of this book by the young Jiaxian. He will not buy the pirated books even if they cost a dime, but this book is fine even if it costs ten yuan, because this is a collection of academic questions. Worth the price.

"Study hard, we said that to become the greatest physicist in the world, we must strive for this goal, and we can't stop for a moment." The young Yang Zhenning did not refuse, nodded, and held up the math problem set. Akira, smiled.

"come on!"

The young Jiaxian nodded heavily.

The sunshine in early March 1937 fell on the classrooms of Chongde Middle School and on the two teenagers.

……

The popularity of math problem sets is still going on.

With the passage of time, after the math problem set spread from No. [-] Middle School to the whole school gathering area, it has been well received by the math masters and top students in major schools, and the sales of the entire problem set has improved to a higher level .

It's just that this explosion has basically nothing to do with Zhang San, who is the author. It's time to come.

In mid-March, Huangchenggen Bookstore, which was in charge of printing the arithmetic problem set, immediately tore up the third batch of 1000 printing contracts after discovering the popularity and potential of the arithmetic problem set, pirated the arithmetic problem set and sold it to the outside world. .

Outside the gate of the Second School of Tsinghua University.

"Sir, Zhang Fu was so unreasonable that he tore up our printing contract. Ruizi went to him for a theory, and he was kicked out." Xu Rui stood beside Yu Hua and walked forward, his breath heavy and his face full of anger. .

"It's okay, are you hurt?"

Yu Hua, who just came out of Tsinghua West Academy and finished today's study, heard these words, and Zhang Fu's face that was eager to save his life appeared in his mind. He shook his head lightly, but did not respond much. It was essentially the Huangchenggen Bookstore of a pirate. , piracy is normal at the moment.

To expect Huangchenggen Bookstore to strictly adhere to the bottom line, it is better to expect dogs to dislike the meat buns delivered to their mouths.

It is necessary to have such a consciousness when looking for a pirate to print a collection of questions.

Yu Hua doesn't blame Huangchenggen Bookstore and Zhang Fu. Of course, Huangchenggen Bookstore will have nothing to do with him in the future.

It's life or death, it's up to fate.

"No, Zhang Fu seems to be looking at your face, sir, and didn't act rude to Ruizi, but I'm just really angry. The pirate workshops and bookstores in the north and west of the city continue to close down. Only Huangchenggen Bookstore relies on your question, Mr. Ji survived, not only did he not thank you, but he tore up the printing contract." Xu Rui shook his head again and again: "Zhang Fu is too hateful to be human!"

"Don't be too angry, it's just a stranger, how many copies of the title book have been sold in total?" Yu Hua looked at the anger on Xu Rui's face, smiled, and patted Xu Rui on the shoulder.

Since learning from Hua Luogeng, Yu Hua has handed over all the sales of arithmetic problem sets to Xu Rui, and no longer pays too much attention to it.

"There are 1259 books in total, and there is no book at home. All the fiat currency obtained is converted into silver dollars according to your requirements, and 1100 oceans are exchanged for the home. The fiat currency is becoming worthless." Xu Rui gave the situation like a treasure.

1100 oceans, no more, no less.

There are still more than 5000 gaps in the 3000 oceans.

When Yu Hua heard it, he calculated it silently, knowing what he was doing: "How is the situation at home? By the way, is there any news on the matter you asked about."

The devaluation of the fiat currency has already begun. This is doomed. After Yu Huazao asked Xu Rui to receive the fiat currency, he would convert it into silver dollars as much as possible.

"The family is safe, Eiko has already inquired. One of the two Japanese people is Fujita Jinzhong, a soldier in the Japanese Pavilion in Dongjiaomin Lane, and the other is Horikoshi Jiro. I don't know what they are doing." Xu Rui glanced left and right, and there was nothing else. Bystanders, whispered.

"Jiro Kugoshi?"

When Yu Hua heard the first name, he had no reaction for a while. After hearing the second name, he was stunned. Isn't this the designer of the Zero fighter?

Why did you come to Peiping?
PS: Wait for more.

(End of this chapter)