The agents were having their own cocktail party at the rice restaurant. As Lei Jun was heading to the cafeteria, he saw Zhao Haiyan again, but perhaps due to the direction, she didn't notice him.
After thinking about it, I turned a corner and went to the lab cafeteria.
The girl contacted him more and more frequently. Lei Jun had just joined the company and didn't want people to gossip, so he deliberately avoided her.
After finishing his meal, Lei Jun was about to leave when he saw Zhu Xiaochen, who was in charge of communication hardware in the hardware group.
"Zhu, what are you doing with all this equipment?"
"Assistant Lei! I need to go out and help out. The signal detection team encountered some technical problems and called to ask for your support. We'll talk later. I'm heading over now."
Lei Jun watched as the man got into a car before returning to his office.
When Zheng Haishan and his team members saw the rice technicians arrive, they exchanged polite handshakes.
"I have indeed encountered some difficulties, and I have no choice but to ask for your help," Zheng Haishan said with a smile.
“I’ve dealt with your department before, so I understand. It’s just a matter of which direction to investigate this time,” Zhu Xiaochen said.
"Don't worry about that for now. After some searching, we found that the repeater wasn't in the southern mountains, but we did find it in the tallest cellar in the city center. However, it wasn't the endpoint. I suspect they used a relay technology, meaning that a signal is emitted from a building in a certain direction and transmitted directly to the tallest cellar in the city center."
Zhu Xiaochen understood. The other party had found the last signal transmitter, which was the first repeater. So where was the remote generator? Was it within the radius of this signal tower?
Five hundred meters or one kilometer in radius. That's a huge range; nobody knows how many buildings there are, but just thinking about that range is enough to give you a headache.
Moreover, they weren't transmitting signals continuously; they've stopped now. How are you going to find the signal source?
It's not turning on, so calling him won't help.
Zheng Haishan said, "Zhu, this is what I'm thinking: the other party's signal source can send and receive signals. As long as the other party hasn't removed the signal source, then it should be able to receive signals, right?"
"That's how it is in theory."
"Then can we reverse the process and use the attack source to find the receiver source?"
"The source of the attack, you mean the phone that was attacked?"
"Yes, it's your new assistant, Lei Jun."
"If you had told me earlier, I would have run into him when I went out. I should have called him along."
“I’ve already had someone call him and bring his attacked phone over. He said he left it in his dorm and needs to go back to get it, but he’ll be here soon. Let’s discuss how to reverse engineer it.”
Zhu Xiaochen frowned and said, "As I just said, it's theoretically possible, but no one has actually done it before. I have no idea how to do it."
“Isn’t this a collaboration? Let me introduce you to a signal expert. Zhang Bo, come here.”
After receiving the call, Lei Jun hurriedly returned to his dormitory and found his phone in an aluminum lunchbox.
I originally intended to throw it away, but considering the phone still had value, I couldn't bear to throw it away. I bought an aluminum lunchbox and put the phone inside.
Metallic aluminum can affect signals, but if it reaches a certain thickness, it can serve as a shield.
He took his phone, went to the company's shuttle service, hailed a car, and went to the city to find Team Leader Zheng Haishan.
We arrived at the destination quickly and saw a familiar face – Zhu Xiaochen, the technician we met at noon.
"What can I do to help?" Lei Jun asked.
"Just use your phone. Does it still have power? If not, you'll need to charge it quickly."
“It’s charged,” Lei Jun said, handing the phone to team leader Zheng Haishan.
Did you bring your old SIM card?
"It's on my phone."
After removing the battery, Zheng Haishan saw the SIM card and said, "I won't use it anymore. I need the SIM card. It's easy for someone to exploit this, even if the phone is turned off."
Lei Jun nodded and said, "Okay, I understand."
Lei Jun looked at his phone and connected it to a device. Zhu Xiaochen started adjusting the knobs on the device, tuning it like an FM radio.
The device has an LCD display showing numbers, and the numbers change every time he adjusts it.
Seeing the fluctuations between the numbers, Lei Jun understood that it was the Hertz number of the frequency band.
At this moment, Lei Jun's mobile phone, acting as the source, sends out a set of signals that need to be relayed back to the original transmitting device via a repeater.
One sends and one receives, one receives and one sends.
That's the principle. The difficulty now is that the other party is a passive signal, which makes locating it quite troublesome.
Zhu Xiaochen said, "I'll increase the power a little here, you guys get ready to scan."
Zheng Haishan gave an OK sign, then spoke into the walkie-talkie: "Attention all groups, scan as soon as you turn on the machine here."
Three voice signals were transmitted through the walkie-talkie to indicate that the message had been received.
Zheng Haishan stared at the oscilloscope and said to Zhu Xiaochen, "Zhu, increase the power."
As the power is continuously adjusted, the Hertz value also increases.
"Stop, hold on!" Zheng Haishan said, raising his hand to Zhu Xiaochen.
Looking at the curve on the oscilloscope, Zheng Haishan picked up the walkie-talkie and asked, "What discoveries have you made, group by group?"
"No abnormalities reported for now," came the voice from the walkie-talkie.
"continue!"
Just as Zheng Haishan finished speaking, the walkie-talkie crackled to life again: "Report, an anomaly detected near the Supply and Marketing Cooperative building on West Third Road! The area is quite large, we need backup."
"Wait here, we'll be right there!" Zheng Haishan said with a hearty laugh, then turned to Zhu Xiaochen and Lei Jun and said, "Thanks to you two! Let's go together."
This chapter is not finished yet. Please click on the next page to continue reading the exciting content!
Continue read on readnovelmtl.com
