my scientific age

Chapter 136 Forge ahead!
"My email?" Lin Wan looked puzzled as she walked up to her and took a slightly larger email from the dorm aunt. It didn't look like a letter, but a book.

The entire envelope was wrapped in a light yellow cover, with a stamp in the upper right corner, and a series of dignified and generous block letters written at the bottom. Lin Wan looked at the mailing list and carefully checked the relevant information.

Mailing address - No. [-] Middle School of Beiping, Xicheng District.

Recipient - Lin Wan.

Sender - Zhang San.

There is a paragraph at the end of the bottom - Lin Wan, my friend.

Zhang San? !
Seeing the name 'Zhang San', Lin Wan was stunned, her brows were slightly wrinkled, and her mind suddenly remembered Zhang San, who had been searching for nothing a few days ago, and Zhang San's version of the book of wrong math problems that was popular in major schools.

The first time I met Zhang San, it was a warning note, and when I met Zhang San again, it was a set of wrong questions. Today, this 'Zhang San' actually sent her an email.

This behavior revealed a lot of information. First of all, this Zhang San knew her address and information. From this, it can be shown that 'Zhang San' has a high probability of knowing her.

Either the people around you or the classmates in the school, the latter is more likely.

"What do you mean by sending me this email?" Lin Wan wondered, thinking about Zhang San's intentions, but to no avail, took a deep breath, picked up the package, turned and walked to the bedroom.

Going up the stairs, back to the bedroom, the room was empty.

Taking advantage of this gap, Lin Wan opened the package. It was full of learning supplies, a book of the most familiar math problems, a national document, and a notebook. The three looked ordinary and unremarkable.

Seeing the three things, Lin Wan frowned slightly. She picked up the set of wrong math problems in her right hand, and flipped through it, but found nothing special.

This is a normal set of wrong questions.

The whole person continued to check the high school Chinese documents, and the result was the same as above.

"What's the situation? Did you send me some school supplies?" Lin Wan was puzzled, and her eyes fell on the notebook at the bottom. The style and size are the most common notebooks on the market. Except for the extremely new features, there is nothing else. valid information.

Lin Wan took out the notebook and opened the brand-new notebook cover with her hands. Suddenly, the first page full of mathematical characters came into view.

This is a math problem, the writing is in block letters, and the entire first page has only this math problem.

"Are you asking me to solve the problem?" Lin Wan frowned slightly, looking thoughtfully at the math problem.

This question appears to be simple, but in fact it is extremely complex. It is a question about functions.

After watching for about 5 minutes, Lin Wan finally had the idea to solve the problem. She picked up the draft paper and pen with her right hand to calculate, and finally got the result of 198.

198?

After coming up with this number, Lin Wan, who has a very high IQ, simply pondered, and couldn't help but look at the set of wrong math problems.

Among the three books, only the collection of math problems has more than 200 pages.

Hope you didn't guess wrong.

Lin Wan took a deep breath, picked up the set of wrong math problems, and turned the pages according to memory.

Sure enough, as we turned to page 198, a situation that had not been discovered before appeared. Pages 198 and 199 seemed to have been artificially treated, the surface was sticky and formed a whole, with a gap between the two pages, and the middle was placed A piece of paper, if you flip through it at will, it will pass by directly.

When Lin Wan saw the paper hidden between the two pages, her heart beat faster, she held her breath, carefully took out the slightly yellowed letter, and then opened it.

Hello, Lin Wan.

If you succeed in seeing this, it means that the secret of the notebook has not been leaked, neither by the postman nor by the Blue Shirts. This is my victory and your luck.

Remember this day, it, congratulations.

Lin Wan, please read the following content in a safe environment, because once the secrets in the notebook are leaked, it will cause endless pursuit by the Blue Shirts and the Japanese, and your life will be in danger. There will be.

This is top secret information that I risked my life to pass on to you, please solve the second math problem.

- Zhang San.

"Top secret information!" Lin Wan read the last sentence of the first paragraph of the letter, her expression suddenly solemn, secretly as the head of the youth organization of Peiping No. [-] Middle School, she was keenly aware of the importance of this email through the content of the letter.

What is the thing that the Blue Shirts and the Japanese are very concerned about?
do not know.

But whatever it is, one thing is for sure - it's good for the organization.

Lin Wan was highly alert, and immediately followed Zhang San's request, got up quickly, went to the door, and locked the door.

The function of the door lock is not to isolate the roommate, but to prevent the roommate from entering the dormitory suddenly, leaving enough time for her to react.

At this stage, the dormitory is the only safe environment where she can read the content behind.

Lin Wan didn't know why such top-secret information was sent by email, but she chose to believe it.

Because, the signature of the letter is - Zhang San.

Although Lin Wan is very curious about the true identity of this person, in Lin Wan's heart, he is a good person who is full of goodwill towards the organization.

Now, this good man is risking his life to pass top-secret information to her.

A safe environment was established, and Lin Wan was the only one left in the bedroom.

There is not much time left, and her roommate will return in a short time. Lin Wan needs to seize the time to understand the situation and return to the desk. This time, she solemnly picks up the letter paper and concentrates on answering the questions. After 3 minutes, she calculates Lin Wan, who gave the correct answer, turned to page 88 as quickly as possible.

Pages 88 and 89 also form a gap.

Inside is the second letter.

Taking out the letter paper, Lin Wan took a deep breath and read the text quietly.

Lin Wan, when you see this letter, it means that you have confirmed that you are in a safe environment, so let's get to the point.

The cause of the incident came from the attempt of the Blue Clothes Club to decipher Japan's newly upgraded cryptographic system-Red Secret, which is a general cryptographic system adopted by the Japanese diplomacy and the Japanese Army. The main users include the Japanese Chinese Garrison Army, the Kwantung Army, the Japanese Embassy in China, Local diplomacy, etc., contains a large amount of important intelligence information every day.

It was upgraded in January this year and came from the green secret system. The Secret Service of the Blue Clothes Society tried to decipher the red secret, but because the red secret adopts the Hill cipher mechanism, the deciphering work has not progressed. Recently, after I joined the deciphering work, The progress is gratifying, and the red secret has been fully deciphered not long ago.

Having said that, I believe you have guessed what the secret in the notebook is.

Yes, that's right, the secret in the notebook is the deciphering data of the Japanese Red Secret. The Japanese Red Secret is based on the mathematical matrix theory, and its nature is replacement code + letter code. The notebook contains the red secret matrix mathematical model, calculation formula, and alphabet. and codebook.

Codebooks are divided into diplomatic and military, consisting of different types of phrases.

With this cipher data, you only need to find a college student who understands the knowledge of matrix theory, and you can completely decipher the intelligence information of the Japanese diplomacy and the Japanese army, so as to grasp the movements of the other party.

I believe that with your mind and experience, you should understand the importance of this red secret deciphering information.

Therefore, Lin Wan, I hope you will do your best to protect it and deliver it to the organization as soon as possible. Be careful, it must not be exposed.

Once exposed, the Japanese will not only launch a frantic hunt for you, but also change the password system immediately, making the results of deciphering the red secret ineffective, and the Blue Shirt Society will also be suspicious of me and others who have participated in the deciphering work. .

As soon as possible, confidentiality is required.

I have taken confidentiality measures in the notebook. The entire red secret deciphering material is written with cobalt chloride material, and the information is all invisible. You need to tear off each page and bake it on the stove before the content of the material will be revealed.

Lin Wan, I know that you are a student of Beiping No. [-] Middle School, and even more so that you are a member of the red organization, but I am sorry that I cannot tell my true identity, and I cannot tell you anything about the content and other information about the deciphering of the red secret. Don't come to me.

The only thing I can tell you is that my name is Zhang San. I am both an extrajudicial fanatic and a patriotic scholar. I look forward to meeting you in my real identity one day.

For the sake of China and the Chinese nation, we must move forward.

Don't let me down.

——April 1937, 4, Zhang San.

silence.

Dead silence.

The room was silent.

"Mr. Zhang San, Jin Yu will not let you down, and will not expose the information and let your efforts go to waste..." Lin Wan, who was holding the second letter, trembled slightly, her eyes slightly trembling as she read the entire letter. Red, the emotions in her heart are extremely complicated, and at the end, she forcibly suppressed her emotions, and her jewel-like eyes revealed a touch of firmness.

(End of this chapter)