Great Country Academician

He didn't clear the table, and didn't go to eat breakfast. After washing his face, Xu Chuan threw himself on the bed. In less than a minute, there was a slight snoring sound in the room.

Usually he sleeps very quietly and doesn't snore, but he was really tired yesterday.

The brain is running at high speed all day, which consumes a lot of energy. The physical energy consumed by mental activities is not worse than physical work, or even better.

This time, Xu Chuan slept until after two o'clock in the afternoon before waking up wobbly.

After taking a shower to clear his mind, he bumped into Zhang Weiping just as he went downstairs to eat.

"Hey, you are here. Where did you go this morning? I was looking for you. I couldn't get through when I called you just now."

Zhang Weiping stopped Xu Chuan, a little curious about where he went these two days.

Xu Chuan thought he had missed the call while taking a shower, took out the phone and looked at it, but found that the screen of the phone that had been in his pocket would go black.

Smiling awkwardly, he shook the phone with a black screen, and said, "I've been in the room all the time. I stayed up late last night looking at those problems. I woke up a little late today. The reason why I can't get through is because the phone is not connected." It's out of battery and I forgot to charge it."

"You, don't try too hard, you still have to pay attention to your body, the future is still long."

Zhang Weiping shook his head and persuaded, other students need to be urged to study, this one is good, and others have to persuade him not to work too hard.

Xu Chuan nodded: "Well, I will pay attention to it, teacher, is there anything you want to do with me?"

"Oh, yes, almost forgot."

Zhang Weiping suddenly came to his senses, and continued: "We have basically read all the materials about the solution of Dirichlet's function by the simplified method. You should rest early tonight. We will have a small meeting in the math room tomorrow. We will discuss some problems and ideas at that time." one time."

"Well, okay, what time will it be tomorrow?" Xu Chuan responded and asked about the time.

"This depends on tomorrow's work schedule. If there is more information to be deciphered tomorrow, it may be postponed."

"Then teacher, just contact me when the time comes, I'll be in my room."

"Okay, remember to charge your phone." Zhang Weiping smiled and patted Xu Chuan on the shoulder.

After finding something to eat casually, Xu Chuan quickly returned to his room after filling his stomach, and continued the unfinished work in the morning.

Tomorrow's meeting is a good opportunity for him, and he can put forward some ideas and methods at the meeting.

It's just that time is tight. He needs to figure out the mathematical laws behind this information war before tomorrow's meeting.

Not to mention completely clear, but at least to be able to understand the general direction.

After all, if he didn't figure it out himself, how could he give others a hint?

Fortunately, the whole night last night was not in vain. Since the end of the thread has been found, the rest of the work can continue to sort out the end of the thread.

The stripping of base transcoding, the definition of the function domain by the compound function and the single function, the participation of the set to determine the value, the hash function changes the input string into a fixed-length output string, and the determination of the compound function and the basic function type.

After having enough inspiring ideas, Xu Chuan found out the secrets behind these mathematical problems one by one.

Basic, but complex, is the best interpretation of the mathematical laws behind these encrypted messages.

In the evening, Xu Chuan put down the signature pen in his hand, stared at the manuscript paper on the table and frowned.

Up to now, he has almost grasped the mathematical laws behind these encrypted messages, but there is still a very critical point that he has not found out.

That is how to determine which function problems and set definitions to use each time the encryption algorithm is changed for these encrypted messages.

If this problem is not resolved, it is still difficult to establish a comprehensive mathematical model to decipher these encrypted messages in time.

Xu Chuan didn't believe that the first district would use completely random functions and sets for encryption combination, because it was unlikely.

The other party must have a function library in their hands, and then generate function problems through calls and combinations and compile them into encrypted messages.

But the huge number of functions and collections determine that if they are applied immediately, even if the spies on the Ninth District have deciphering equipment in their hands, it will take a long time to decipher it, or they will not be able to decipher it.

Because there are no rules, every time it is applied and decrypted, the difficulty of calculation and the amount of calculation required will increase exponentially.

Just two-digit function calls are enough to kill any home computer.

If the function application grows to three digits, it will take a long time for a supercomputer to solve it in the case of a digital model.

Unless these spies use supercomputers as deciphering equipment, this is nonsense. How can ordinary computers have such a large computing power to perform calculations?

So this is obviously impossible.

Xu Chuan didn't believe that those spies would know what kind of deciphered function it was, and then use numerical simulation to solve it after confirming it.

Not to mention those spies, even he himself dare not claim to know all the functions.

A little twist on this thing is a brand new kind of person who can know everyone, and that is 100% a top mathematician in a country.

This kind of talent is sent to be a spy, and it is not so outrageous for the president of the first district to be replaced by a dog.

Therefore, there must be embedded rules in the original ciphertext or the plaintext after preliminary cracking.

Thinking about it, Xu Chuan turned his attention to the original ciphertext and the deciphered plaintext.

The information is still preliminarily sorted in chronological order, and then the function questions and answers are attached below to search for clues.

But the huge and disorganized original ciphertext made him instantly give up the idea of ​​looking at the original ciphertext first, and turned his attention to the plaintext after the preliminary decipherment.

This time, it didn't take long. After reading a few plaintext messages and the corresponding function questions, Xu Chuan's eyes lit up. He probably already knew what method the other party used.

However, in order to make sure that the idea in his mind was okay, he still chose to continue reading the rest of the information.