At that moment, Instructor Zheng said to Huang Feihong: "Feihong, you first see how I do it, pay attention to every detail, and then you have to practice repeatedly, and you must be able to operate skillfully even with your eyes closed." ”

"Instructor Zheng, don't worry, even if you lose a few pounds of meat, I will master this skillfully."

"That's good, when the teacher likes such a ruthless student the most, now I'll start the demonstration right away."

The instructor came to a signal transmitter and turned on the machine and a computer at the same time.

Instructor Zheng said: "Feihong, do you know, this machine can send thousands of signals at the same time. ”

"That's amazing."

"Yes, now I'm going to turn on this receiver."

After Instructor Zheng finished speaking, he turned on the button of the receiver, and the small light on the receiving device flashed immediately.

Three minutes later, Instructor Zheng turned off the transmitter.

Instructor Zheng said: "Now the receiving equipment has received and filtered all the signals, and only the useful signals are left, and they have been transmitted to the computer. ”

"It's amazing."

"Let's go, let's turn on the computer and turn on."

The two of them came to the computer, and Instructor Zheng opened a certain folder in the computer, which showed more than a dozen pieces of information.

Huang Feihong asked puzzledly: "Instructor Zheng, how does this receiving device achieve filtration." ”

Instructor Zheng thought for a while and said: "Let me tell you this, because this set of equipment is specially designed for the enemy party, therefore, the sensitive words and words that may appear on the other party's phone are all lost in the chip of the receiving device. ”

"It's amazing."

"If it's a signal from an encrypted phone, it will be automatically answered, and then used by experts to crack it."

"Understood. But there's one more question. ”

"Feihong, you say."

"If they don't use wireless communication for important calls, but a dedicated telephone line, then this device won't be useful, right?"

Instructor Zheng said happily: "Feihong, what you said is so right, it seems that you were born to be a high-level agent." Because of this, the command system in the military of various countries is still using a large number of special lines to call, but this is not a way to eavesdrop, but the difficulty has increased, please remember that no matter how advanced the equipment is designed and manufactured by people, as long as it is designed and manufactured by people, then there is a way to eavesdrop, this will be talked about later, and now your task is to learn this first. ”

Huang Feihong said, "Understood." ”

"Also, there are times when you can't use a dedicated telephone, for example, in wartime, pilots and ships on the ground, ships, submarines and command headquarters at sea can only use wireless communication."

"Understood."

Instructor Zheng said to Huang Feihong again: "Have you seen this information intercepted on the computer?" Each text is a piece of information, we can use the audio of the computer, restore these sounds, and then find the most valuable information from it, only those encrypted messages, directly to the cryptographic experts, they will find a way to open it. ”

"Understood."

"Now let's listen to these intercepted calls."

Instructor Zheng then turned on the audio of those texts one by one, and the recording of the call between the two sides was broadcast on the speaker.

Huang Feihong also heard a different sentence, because these calls were in foreign languages.

Huang Feihong said: "Instructor Zheng, I don't understand. ”

"Feihong, don't talk about you, even I can't understand it, because it's impossible for a person to learn so many foreign languages in a kid, our task is to collect this information, and naturally someone will understand what it is."

"Understood."

Instructor Zheng said: "So, you still have to practice how to send these intercepted information to the relevant departments." ”

"Teacher Zheng, how do you send it?"

Instructor Zheng said: "Of course, it is a secret channel, if it is in China, you can encrypt this information and send it directly to the mailbox of a certain department." If you are abroad, you can send it back to your country via guò encrypted communication devices. ”

"Instructor Zheng, how does the encryption process work?"

"This is the content of the training later, now your task is to do the repeated practice I just did a few times, this must be skilled and skilled, and there can be no slightest mistake. Feihong, now you need to operate it yourself. ”

"Okay."

Huang Feihong then walked up to the transmitter, turned on the button, and the device began to work.

Instructor Zheng said: "Now it starts to transmit signals, but it is different from the last signal, you immediately use that receiving device to intercept the signal." ”

Huang Feihong immediately opened the button of the box, began to receive, and after three minutes, he turned off the box, and then skillfully opened a text folder on the computer, opened the text one by one, and turned on the audio, so every intercepted call was broadcast in the speaker.

Instructor Zheng was very happy to see that Huang Feihong could learn as soon as he learned it, and said, "Feihong, your IQ is very high, and you are too smart." ”

"Thank you, Instructor Zheng, for the compliment."

"But it's not enough to be smart, you must practice anti-corruption, so that you can close your eyes and be proficient in operation, now you listen to my orders."

Huang Feihong stood up and said, "Teacher, give an order." ”

"Take the process just now, and operate it thirty times in a row."

"Yes."

Instructor Zheng then walked out of the warehouse, leaving Huang Feihong alone, he practiced over and over again according to what the instructor said, although he felt that the instructor's requirements for himself seemed to be a bit harsh, but he knew that the instructor's request was completely reasonable, because intelligence work is not child's play, and a country's security and interests are closely related, in case of any slightest mistake, it will be extremely huge for a country, and it will be difficult to make up for the loss.

Thinking like this, Huang Feihong practiced hard and operated it over and over again, which was really meticulous. In the end, he entered the realm of forgetting both things and himself. Huang Feihong thought of the teacher's request, that is, to operate successfully with his eyes closed, so he really operated with his eyes closed, and finally he succeeded.

After thirty times, he was already tired and sweating, but the operation seemed to have reached the point of being superb.

Huang Feihong looked at the time, it was almost noon, it turned out that he had been operating for more than two hours in one breath.

At this time, the door of the warehouse opened, and Instructor Zheng walked in with a smile.

Instructor Zheng said: "Feihong, this is the end of the morning's training, let's leave, go down and continue training." ”

"Mr. Zheng, let me show you one last time."

"No need, I've been watching you all the time, there's a camera in my room, I announce, you've passed the morning training."

The two of them then walked out of the warehouse and went downstairs to Instructor Zheng's office.