Qin Chuan left St. John's University with no interest, even though he repeatedly tried to persuade him to stay, and was even prepared to pay the tuition and living expenses for his two students, Liu Jie and Zheng Yusen. Although Qin Chuan's move moved them both to tears, but

The two of them are still very determined.

Qin Chuan was a little sad about the departure of these two students. With the talent and hard work of these two people, if they continue to work hard in the field of mathematics, their future results will definitely be better than that of him, a mathematician who is almost a cheat.

A lot, and even two more famous mathematicians in China.

You know, before World War II, if China was not inferior to the Japanese in any aspect, it was modern mathematics.

During this period, China produced many internationally renowned mathematicians. Even for a long time after World War II, China's achievements in the field of mathematics were quite dazzling.

Qin Chuan knew that these two people were probably going to return to their respective camps to use the knowledge he taught to participate in code-breaking work. Their superiors were too impatient.

What makes Qin Chuan a little strange is that in his memory, HD has always done a good job in deciphering the Kuomintang's codes. The Kuomintang's messages will often be successfully deciphered by them in a short time, so that in the

During the famous Long March, he traveled tens of thousands of miles without receiving any support from the outside world. Although he suffered huge losses, he still tenaciously broke through every obstacle of the Kuomintang and avoided every trap. Among them, the deciphering work gave

HD's huge support gave them a pair of ears and clairvoyance, and the Kuomintang's major pursuit and interception operations were all under their control.

And HD's own telecommunications passwords are extremely perfect. Qin Chuan knew that their passwords were called "high secrets" and were compiled by senior leaders of HD themselves. This "high secret" passwords are extremely strict because they have always been kept secret.

Yes, so in his previous life, Qin Chuan studied passwords out of interest in college, but the "big secret" was still kept strictly confidential, and he was never able to get a glimpse of it.

Qin Chuan could not find any specific information about the "Hao secret", but it was said that each time this password was used, it was equivalent to a brand new password. There seemed to be no rules to follow and it was extremely difficult to decipher.

Although Qin Chuan highly admires this legendary "big secret" and even admires and admires the HD senior leader who invented this code, he is still skeptical about the "no rules" in the legend.

Yes, Qin Chuan believes that in principle, any password has rules, otherwise it would be impossible to compile at all. It just depends on how big the rules can be.

However, judging from the fact that this code has never been deciphered by the Kuomintang Party in decades, the preparation of this "high secret" should be extremely clever and profound.

I just don’t know if there will be a miracle after the Kuomintang masters the use of mathematical methods to decipher it?

At this moment, Qin Chuan even regretted that he had prematurely introduced mathematical methods to decipher codes into the country.

However, Qin Chuan thought about it and thought that HD's "high secret" should not be deciphered yet, because after the end of World War II, it is impossible for the Kuomintang not to know the method of mathematical deciphering, but it still has not successfully deciphered the "high secret". This is

Proof.

Fortunately, Liu Jie is from their second office, and their second office's mission is not mainly aimed at HD, which makes Qin Chuan feel a little more at ease.

Qin Chuan tried his best to dispel the worries in his heart, called a rickshaw at the school gate, and then went straight to Xiafei Road in the French Concession.

At the intersection of Xiafei Road, Qin Chuan got off the rickshaw and strolled slowly on the street while taking the opportunity to check the surrounding situation.

Although this is not yet a Japanese world, and they don't dare to show off and do whatever they want blatantly, Qin Chuan always firmly believes in one sentence, that is, be careful and you will never make a big mistake.

When Qin Chuan arrived at Haijiao Western Restaurant, it was just after four o'clock. Although it was not the peak time for customers and there were not many customers in the restaurant, Qin Chuan still refused the waiter's guidance and went straight to the bar.

The waiter at the restaurant said, "My friend invited me to dine at your place, but I don't know if he has confirmed the seat?"

The head waiter opened a leather folder on the bar to check the order status, and asked, "Excuse me, sir, what is your friend's surname?"

"The surname is Qi, but he also made an appointment with someone else. I don't know if it was another person who reserved the seat."

The foreman looked at the dining reservation record, then smiled and said to Qin Chuan, "We don't have reservations for Mr. Qi here. There are two Mr. Li, one Mr. Zhang, and one Mr. Liu who have reservations. They are all from here.

Regular patrons have reserved tables No. 6, Table 9, Table 16 and Table 19."

Qin Chuan quickly glanced around the restaurant, then nodded to the waiter and said, "Oh, my friends probably forgot to make a reservation, so I will find a seat and wait for them first."

After Qin Chuan finished speaking, he walked to table No. 4 by the window and sat down directly opposite the restaurant door. Then he asked the waiter to give him a glass of beer first, and then took out today's meal from his handbag.

"Declaration", covered his face with the newspaper, and began to read the newspaper.

According to Duan Haiping, their people only entered the restaurant when they followed Wang Jiuzhou for the first time, and did not enter the other two times. Mainly because their current mission is also to lurk and they did not dare to be exposed, so they did not enter in the next two times.

Follow along.

The time they followed him in was on Thursday. Wang Jiuzhou seemed to be in a hurry. He hurriedly left the River Management Office half an hour after get off work and came here to meet with the bookstore owner. That time he was sitting at table No. 5.

Although I didn't follow up the last two times, I know that they both arrived here before 4:30. At that time, the nearby foreign stores had not finished work, and the number of customers in the restaurant had just begun to increase, and Wang Jiuzhou and the bookstore owner

None of them sat at table 5 by the window.

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From an agent's point of view, in places with glass windows, especially in places with large glass windows like Western restaurants, you should try to avoid the window seat, because people outside can easily see you, and Table No. 5 is right there.

It was a seat by the window. Qin Chuan estimated that it was a sudden temporary meeting between the two, and the suitable seat was occupied.

As for the last two times, although I didn't follow them, I didn't see anyone outside through the window, which means that the two of them were sitting in their usual seats.

From an agent's point of view, it is generally necessary to choose a position with a wide field of vision so that people entering and exiting the restaurant can be seen clearly, preferably close to the door, so that danger can be detected in time and at the same time, one can leave urgently in times of crisis.

Table No. 19 is the most suitable location. Not only does it have a wide view, but there is also a door leading to the kitchen not far behind you.

However, as a precaution, Qin Chuan still chose table No. 4 by the window. Here, he could clearly see the situation at table No. 19 while maintaining a sufficient distance. The most important thing was that he was here by the window so that the other party could not treat them badly.

He only needs to let Qi Lanfeng find out who the bookstore owner is having dinner with.

However, the window seat makes it easy for the bookstore owner to spot him. Qin Chuan has been to the bookstore. If the bookstore owner is more cautious, it is not impossible to temporarily change the joint location after discovering him.

Although there are many sects of Japanese intelligence system, each with its own system, the number of spies, training methods and methods, spy quality and acting style are very different between different systems. Even the intelligence system of the Japanese Navy is different from that of the Japanese Army and the Special High School.

Compared with the Military Police, they are relatively scummy, but I’m sure this bookstore owner may be one of the few outliers.
Chapter completed!