The secret war is silent

Luo Yao has been investigating Lao Mu.

Just in order not to alert the other party, no external channels were used, and everything was done by myself, so as to ensure that no one would be alerted.

In addition to taking Gong Hui to drink coffee and eat desserts made by Lao Mu every weekend.

As long as he has time, he will try to find opportunities to observe and track Lao Mu's whereabouts, and try to understand his social scope, living habits, eating habits, etc.

There is also information about all the waiters and kitchen staff in Lao Mu Coffee House. Those who have stayed there within the past five years, those who have resigned, and those who are currently employed are all within the scope of the investigation.

In addition, Luo Yao also asked Xu Jihong to monitor the phone calls at Twilight Cafe and his residence.

He can use almost all the means at his disposal.

"Team leader, I have a new discovery. Do you want to hear it?" This morning, Luo Yao was eating breakfast and preparing to go to school when Xu Jihong suddenly called.

"Well, I'll see you in Yuhetang in ten minutes."

"It's that vixen again. Why is she always calling you? She must have some designs on you?" Gong Hui was very amused, but she couldn't do anything to Xu Jihong. They were all from the temporary training class, and Luo Yao was nothing like her. people.

She regrets it now. If she had agreed at the Huanggang County Army Depot warehouse, she would have been able to expel the people right now!

"This is work, Xiaohui. You have to distinguish between public and private affairs. Don't always think about useless things." After finishing the meal, Luo Yao put down the bowl and chopsticks and said, "I'll leave first. You can clean up."

"Hmph, I want to go too. What did she say?"

"No, you said you wanted to be a telegraph operator. What if dad calls and we don't get the call?" Luo Yao shook his head.

"Then you promise me not to be tempted by that vixen."

"Let me give you the bottom line. Unless the Japanese invaders are driven out of China, I will not consider personal feelings. Therefore, you'd better not waste your feelings on me." Luo Yao sighed, something It's better to make it clear. Although he is not sure about his future, he will never consider personal issues until this war is over.

Gong Hui was stunned.

Luo Yao said very firmly, and it didn't sound like he was joking. Gong Hui could tell that this man looked gentle as jade, but his bones were as hard as a rock. He would never change his determination easily. .

She suddenly hated herself. Such an important opportunity went wrong. If she had agreed at that time, she could consider herself her girlfriend, even if they were not married, it would still be different.

"Think about it carefully. If you feel that our current status is not suitable, you can adjust it now." After Luo Yao finished speaking, he put on his coat and went out.

ten minutes later.

Luo Yao appeared in the backyard of "Yuhetang".

Xu Jihong was already waiting there.

"Team leader, I studied your process of tracking 'Lin Miao' and found that when you were tracking 'Lin Miao', he once made a call to the outside world through the department store phone number. You also called this phone number, but It’s an empty number to call, right?”

"Yes, I find it strange too. I don't know why, but the number should be correct." Luo Yao nodded, and he wrote all of this in the action report.

It's not surprising that Xu Jihong could see it. After all, he is now a member of the team and has the right to understand the team's past actions so that he can discover new clues.

After all, there are still many doubts about the case of "Kappa" Lin Miao that have not been clarified, especially the fact that he has a "sister" who manipulates him, and this person has not yet been unearthed.

"Well, what did you find?" Luo Yao asked.

"I thought it was strange at first. If it wasn't the team leader who made a mistake, then there must be a problem in some link." Xu Jihong said, "So, I went to the telephone office to check again and found that the number was indeed empty. No. The telephone company has never assigned this number to any person or organization."

"continue."

"Later I discovered that the French Concession telephone exchange used the most advanced automatic switchboard and did not require manual transfer. So I wondered if someone would take advantage of this and transfer calls to this empty number to another one. Number, in this way, even if we know the number that was dialed, it is impossible to know who actually answered the phone?" Xu Jihong explained.

"Is it technically possible?"

"Yes, there are such automatic switches abroad. It can completely convert the incoming number into another number through certain settings." Xu Jihong said. (The author is not a telecommunications expert, so my explanation may not be in place, please forgive me)

"In other words, the number Lin Miao dialed is actually not the same number as the number he wanted to call, but it can be converted between the two, is that what you mean?" Luo Yaodao, he also suddenly realized, isn't this an automatic transfer? Well, it is a very mature technology in later generations.

But now, it's really amazing that someone can think of using it for secret communication.

"That's pretty much what it means, so I analyzed the line where this number is located." Xu Jihong took out a list of phone numbers and handed it to Luo Yao and said, "Although I don't know which number this call was ultimately made to, it must be on One of these numbers!”

Luo Yao nodded. Today's automatic telephone switches are not as good as those of later generations. A group of switches controls dozens of phone numbers. This is fixed, so it is easy to check the phone numbers on the same line.

And it’s very easy to list.

"After the empty number is transferred, a simple automatic transfer device is used to transfer the call from this empty number to a certain number above, and the call is connected. If anyone traces it afterwards, It’s just an empty number and nothing can be found.”

"Can we use this call transfer technology?" Luo Yao asked.

"Yes, but team leader, is this necessary?" Xu Jihong was stunned for a moment and asked.

"Of course, since the enemy can use it, we can also use it. In order to be prepared, we can set up a few empty signals and conversion devices like this first." Luo Yaodao.

"Okay, I'll make it later." Xu Jihong nodded. In terms of telecommunications technology, she was one of the best in the temporary training class. Even the instructors may not be as good as her now.

"Can we screen out which of these numbers is the real number?"

"We didn't get the device, but we can check the line. However, I think that since something happened to Lin Miao and so much time has passed, the other party should have dismantled the device." Xu Jihong said.

"It has been so long. We are only checking the line now so that our opponents will not be suspicious. Moreover, even if the device is dismantled, it will leave traces. This is also a clue." Luo Yao said, "Let the telephone company arrange a telephone route. For maintenance, you should check it yourself, and if there is any problem, report it as soon as possible."

"Yes, team leader."

"Xu Jihong, if you can find the real phone number and identify the target, you will have made a great contribution." Luo Yao said, "When the time comes, I will report it to the bureau headquarters for you."

"Thank you, team leader." Xu Jihong showed a hint of joy and smiled charmingly, "When will the team leader be free? Where can I get good coffee..."

Luo Yao didn't dare to take advantage of this, so he just turned around and left.

"The team leader likes gentle and pure people. You are destined to fail to catch the eye of the team leader by flirting like this." Gu Yuan passed by and teased.

Xu Jihong glanced at Gu Yuan: "You know nothing. Men say they don't like it, but in fact they don't know what they think in their hearts."

"Anyway, I don't think you have any chance with the team leader." Gu Yuan chuckled. He and Xu Jihong were also very familiar with each other, and it was normal for them to make derogatory remarks about each other.

"Then just wait and see." Xu Jihong stomped his feet, grunted and walked away.

"Then I have to thank you..." Looking at Xu Jihong's enchanting back, Gu Yuan murmured to himself.

…

If Xu Jihong could really find out the phone number that "Lin Miao" called "Sir", it would really be a great help to him.

Although he suspected that Lao Mu was the gentleman "Lin Miao" mentioned, there was no evidence, and he was in the French Concession. Although he had no backstage, his network of connections was deep.

If you want to move him, you really need to have solid evidence. Unlike Han Liangze, Lao Mu can be arrested with just one order and he doesn't dare to resist.

Because he knew that the consequences of resistance would be more serious.

But that may not be the case for Lao Mu.

Arresting people in the French Concession cannot pass the level of the patrol office. If notified in advance, the possibility of leaking the secret is very high, and the French may not agree.

Moreover, the group directly under Luo Yao is not a government agency with public activities. Many things can only be done secretly, so the performance in the French Concession is much more restricted.

If you think about it this way, "Lao Mu" has his own reasons for placing his base camp in the French Concession.

…

"Teacher Qin, classmate Xia Yu didn't come to school today. I want to go to her house after school. Can you go with me?" When it was almost time to get off work, Jiang Xiaoyu came to Luo Yao and said to her.

"Didn't Xia Yu get sick and ask other students to take leave on their behalf?"

"She just said she was sick, but she didn't say what the disease was. As a class teacher, I was a little worried and wanted to know more about it?" Jiang Xiaoyu explained.

"That's it..." Luo Yao wanted to refuse, but when he thought of Jiang Xiaoyu, a girl, the public security in Jiangcheng was getting more and more chaotic. If he met a bad person, it would be troublesome.

Besides, home visits are also something that a teacher should do, so it would not be appropriate to refuse.

Jiang Xiaoyu helped him a lot in school. Even from the perspective of gratitude, he couldn't refuse Jiang Xiaoyu and could only agree.

"I heard that Xia Yu's father works in a government department. Isn't it too rude of us to just go over like this?" Luo Yao asked.

"What do you mean?"

"Call and ask first to see if Xia Yu's parents are free tonight. Are they at home?" Luo Yao suggested.

"Yes, thank you for reminding me. I'll make a call right away." Jiang Xiaoyu blushed and ran to make a call.