Chapter 52 Completed Decoding (please vote for the third update and follow up)
Without clearing the table or going to have breakfast, Xu Chuan threw himself on the bed after washing his face. In less than a minute, soft snoring could be heard in the room.
Normally he sleeps very quietly and doesn't snore, but he was really tired yesterday.
The brain is running at high speed all day long, which consumes a huge amount of energy. The physical energy consumed by mental activities is not worse than that of physical work, or even better.
This time, Xu Chuan slept until about two o'clock in the afternoon, then woke up slowly.
After taking a shower to clear my head, I bumped into Zhang Weiping as soon as I went downstairs to eat.
"Hey, you're here. Where have you been this morning? I'm looking for you. I couldn't get through to you even if I called you just now."
Zhang Weiping called to Xu Chuan and was a little curious about where he had been in the past two days.
Xu Chuan thought he had missed a call while taking a shower. He took out his phone and took a look, only to find that the screen of the phone he had kept in his pocket had gone black.
He smiled awkwardly, shook the phone with a black screen, and said: "I have been in the room all the time. I stayed up late last night looking at those problems. I got up a little late today. The reason why the call can't be reached is because the phone is not working."
The battery ran out and I forgot to charge it.”
"Hey, don't work too hard. You still have to pay attention to your health. The future is still long."
Basic, but complex, it is the best explanation of the mathematical laws behind these encrypted messages.
Zhang Weiping suddenly came to his senses and continued: "We have basically read the information on solving the Dirichlet function using the simplified method. You go to bed early tonight. We will have a small meeting in the mathematics room tomorrow. We will discuss some issues and ideas then.
one time."
Unless these spies use supercomputers as deciphering equipment, this is nonsense. How can ordinary computers have so much computing power to perform calculations?
In the evening, Xu Chuan put down the pen in his hand, stared at the manuscript paper on the table and frowned.
I don’t say I have a complete understanding, but at least I have to be able to understand the general direction.
Fortunately, the whole night last night was not in vain. Now that the thread has been found, the remaining work can be continued after the thread is sorted out.
Xu Chuan did not believe that the first area would use completely random functions and sets to perform encrypted combinations, because this was impossible.
The other party must have a function library in hand, and then generate function questions through calling and combination, and then compile the encrypted message.
"Well, okay, what time will it be tomorrow?" Xu Chuan responded and asked about the time.
Xu Chuan nodded: "Well, I will pay attention. Teacher, do you have any business with me?"
"Okay, remember to charge your phone." Zhang Weiping smiled and patted Xu Chuan on the shoulder.
So this is obviously impossible.
If the function application grows to three digits, it will take a long time for a supercomputer to solve it if there is a numerical model.
That is how to determine which functions and set definitions to use every time the encryption algorithm of these encrypted messages is changed.
It would be unreasonable for such talents to be sent as espionage agents, even if the president of District 1 is replaced by a dog.
"Oh, yes, I almost forgot."
With a slight twist, this thing becomes a brand new type of person that everyone can recognize, and that person is 100% the top mathematician in a country.
"Then teacher, just contact me when the time comes. I'll be in my room."
Not to mention the spies, even he himself dared not claim to know all the functions.
If this problem is not solved, it will still be difficult to establish a comprehensive mathematical model to decipher these encrypted messages in a timely manner.
By now, he has almost figured out the mathematical laws behind these encrypted messages, but there is still a very critical point that he has not found out.
After finding some food and filling his stomach, Xu Chuan quickly returned to his room and continued the unfinished work in the morning.
With only two-digit function application, any home computer can be beaten to death.
Stripping of base transcoding, composite functions and single functions jointly define the function domain, the participation of sets determines the value, the hash function changes the input string into a fixed-length output string, and the types of composite functions and basic functions are determined.
After having enough inspiration, Xu Chuan found out the secrets behind these mathematical problems one by one.
After all, if he doesn't figure it out himself, how can he give hints to others?
Therefore, there must be embedded patterns in the original ciphertext or the initially cracked plaintext.
Zhang Weiping shook his head and advised, other students need to be pushed to study, but this one needs to be persuaded not to work too hard.
Xu Chuan didn't believe that those intelligence officers would know what kind of function the deciphered function was, and then use numerical models to solve it after confirming it.
However, the huge functions and collections determine that if it is applied immediately, even if the intelligence personnel in District 9 have decoding equipment, it will take a long time to solve it, or it will be impossible to solve it.
"This depends on tomorrow's work schedule. If there is a lot of information that needs to be deciphered tomorrow, it may be pushed back."
The meeting tomorrow is a good opportunity for him, and he can put forward some ideas and methods at the meeting.
Thinking about it, Xu Chuan turned his attention to the original cipher text and the deciphered plain text.
Because if there is no pattern, every time it is applied and decrypted randomly, the calculation difficulty and the amount of calculation required will increase exponentially.
But time is tight. He needs to figure out the mathematical rules behind this information war before tomorrow's meeting.
I will still preliminary sort these materials in chronological order, and then attach the function questions and answers below to look for clues.
But the huge and messy original ciphertext made him instantly give up the idea of reading the original ciphertext first, and turned his attention to the initially deciphered plaintext.
This time, it didn't take long. After reading several plaintext messages and corresponding function questions, Xu Chuan's eyes brightened. He probably already knew what methods the other party used.
However, in order to make sure that the thoughts in his mind were correct, he still chose to continue reading the remaining information.