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Tower Software's headquarters is fifty floors high, with important information departments on the thirty to fiftieth floor! The elevators above the tenth floor have been closed, and the fire escapes are guarded by security guards. The company's setup is like the production process of a branded mobile phone. The casing of the mobile phone is

Made in China, the batteries for mobile phones are made in Vietnam, and the glass for mobile phones is made in the Philippines. Below the 30th floor are these jobs. Of course there is also the business department, marketing department, etc. Above the 30th floor are those produced in China, Vietnam, and the Philippines.

The combination of things, coupled with its own confidential core settings. Therefore, the highest technical content is above the 30th floor.

After downloading the Trojan implanted a few days ago, I found the llL code. Then I came back to download the source code... Yu Ming pondered, this guy couldn't be a very high-level person, and he didn't know that he could get garbled code.

The conference room on the 30th floor became a temporary office space for several people. The technical director of Tata Software, a woman in her 34s and 50s, was in charge of the reception. The two parties knew each other. The technical director was called An An, an alumnus of Li Fu and a female Ph.D.

.

Yu Ming first asked: "Who knew that there are security settings in the software and the downloaded data will be converted into garbled characters?"

An An clicked on the computer, and twelve people were ticked on the list on the big screen. Yu Ming said: "Remove them."

"Okay." An An removed these twelve people.

Yu Mingdao: "Who knew that the source code of the terminal is needed to crack the garbled code."

An An introduced: "Garbled characters are a protective measure. If you can't decode it outside, you will definitely think of decoding it in the company. If you can't decode it in the company, you will definitely think of the terminal."

Yu Mingdao: "Does that mean everyone knows?"

"No, actually we haven't used this garbled code protection method for three years. Because this protection program will cause the computer to perform too many background operations, and cause the system to slow down or even crash."

Yu Ming asked: "Who knew that this kind of garbled code could only be solved through the terminal source code?"

"I'm not sure." An An said, "There is communication between colleagues."

Lix asked: "Yu Ming, why did you exclude these twelve people?"

"They knew there were security garbled settings. When planting Trojans into the terminal, they would also download the source code needed for cracking." Yu Ming said: "But this case happened in two parts. The other party first planted the Trojans to download the data, and then took risks.

Downloading the source code that cracks the garbled code shows that they don’t even know that this software has such security settings.”

Tommy and Lix looked at each other and nodded. This was also the result of their analysis. However, they were very satisfied that Ming could find this problem immediately. Tommy said: "There are still seventy suspects, what do you think?

"

Puji said: "We need to investigate, inquire about personal belongings, etc."

An An said: "You have the highest authority and can talk to any employee at any time."

Tommy clapped his hands: "Let's go."

The terminal is on the forty-fifth floor, and there are two security guards standing at the door. It is equipped with an ID lock and an eye mask scanner. To get here, you need to swipe through two security doors with your ID card.

Mandy asked: "Were there two guards here when the accident happened?"

"No. The forty-five to fifty floors are the absolute core of Tata Software." An An looked at the employees on both sides who were still busy working in white and said: "There are many geniuses among them, and geniuses sometimes have quirks, you know.

The working environment here is transparent. If there are two guards in their sight, they will appear uneasy. So we use monitoring means plus safety door protection technology."

Yu Ming looked at this passage, which was about 30 meters long. There were workshops on both sides. No matter where you go to the terminal hangar, you need to pass through an ID security door and break through the eye mask and ID security door. The security door is made of glass.

…

Puji said: "This is incredible. Even if everyone is a nerd. How dare the criminal suspect take such a big risk to walk through a passage? As long as someone looks at him, he will be exposed. Are you sure there is only this passage?"

"OK." The accompanying security supervisor replied.

Mengni said: "You can't calculate the time when the Trojan was first planted, can you? Is there someone on duty at night?"

An An felt a little ashamed: "It may not have been at night. Our original attitude towards terminal protection was not very correct. At least ten people had entered and exited the terminal hangar. It was not until the Trojan was discovered that the permissions were locked, and only I could enter."

Monnie: "These ten people are..."

An An said: "This makes no sense. Our company has a product that is similar to a flash memory and has wireless receiving and transmitting functions. It is the size of a U disk. As long as someone is within five meters of the terminal, someone can physically access the terminal. The flash memory connection can be controlled remotely.

To the terminal."

Lix said: "That is to say, anyone can put a flash memory in the body of a person who has permission to enter and plant a Trojan. However, after the Trojan was discovered, the permission to enter the terminal hangar was revoked, leaving only Director An An. But there is still no equipment.

A security guard?"

"Yes, although the Trojan was found, I still believe in the garbled protection system." An An replied.

Mandy said: "In other words, after the other party invaded, they found that the data was garbled. Then they found a way to clone your ID card and eye mask?"

Lix frowned: "This requires very professional technical support. It cannot be completed by one person."

"Ladies and gentlemen," An An said, "I don't care who wants to steal our company's secrets. I only care about the security of the source code. Once the source code is leaked, we may face lawsuits that can bankrupt our company."

"…···" Everyone was silent, and they were right. It is none of their business whether there is any external group providing technical support. Their role is to catch the suspect and get the source code back.

Yu Ming asked: "According to the report, someone attacked the monitoring system, causing the monitoring system to be paralyzed for half an hour. In addition to the monitoring system, what else was attacked?"

An An answered firmly: "No."

"This is strange." Yu Ming muttered.

Mandy asked softly: "What did you find?"

Yu Mingdao: "I have figured out a way to reach the terminal hangar safely without being discovered by the staff. But the conditions are not met."

Mandy also wanted to ask a question. A security guard came up and said. The security chief said: "Please come with us to the 50th floor."

Yu Ming asked: "Can I have a chat with the staff?"

An An said: "Of course, do you need me to accompany you? You know that their communication skills will be poor."

"I know computers." Yu Ming said: "I will go to the 50th floor to meet you in a moment."

On the table in the conference room on the 50th floor, there is a small mountain piled up. The small mountain is composed of mobile phones, laptops, tablets, PDAs, U disks, flash drives, etc.

An An said: "All desktop computers have been inspected and no source code has been found. These are the private computers of all employees. We can search them through special software. As for U disks and flash drives, you may need your help to screen them."

Mandy said: "We need an employee's information. Including financial crisis, marital crisis. We also need a personnel list, a list of employees who have been punished within three months. Also, there are some employees who have done a good job and at least he thinks he is excellent.

, but the list of employees who are not recognized is not available.”

An An asked: "Why?"

Mandy said: "We have discussed before that there are at least two technical teams supporting this suspect. Since it is a gang crime, it is very logical. They choose the suspect to cooperate with them in committing the crime, and it will never be without investigation.

.Any employee with these records is their first choice for cooperation.”

Tommy said: "Mandy is responsible for the personnel investigation. Monnie, you also graduated with a computer major. You and Lix checked the USB flash drive and mobile phone. Phuket, you are good at psychological analysis. You can find people to question and analyze that the other party may hide the source code.

where."

"Yes, sir." Everyone started to get busy.

Does Yu Ming understand computers? Of course Yu Ming understands, at least he knows how to surf the Internet and download pornographic films. But these creatures are so cruel and they confuse Yu Ming, who is not proficient in English technical terms, as soon as they open their mouths.

"Death knife." Yu Ming stopped and said, "I just want to know, within half an hour after the monitoring collapsed, were your other facilities discovered to have been invaded?"

A girl wearing glasses looked at Yu Ming for a while and said: "It depends on the method used by the other party to invade..."

Tommy stood behind Yu Ming and said kindly: "Use the simplest words to express what you mean."

Yu Ming nodded and asked: "Did you have a power outage at that time?"

"No." The girl thought about it and said, "The last power outage happened eight years ago..."

"I know." Yu Ming said: "Second question, is there a power outage in the corridor?"

The girl thought for a long time and asked the man with glasses next to her. Then the two of them went to ask others. Yu Ming was speechless.

Tommy asked: "Why do you ask that question?"

"Because there is only one way to reach the terminal hangar through the passage without being discovered." Yu Ming said: "That is the studio is brightly lit, but the passage is dark. They can't even remember whether there was a power outage at that time?"

Tommy said: "This building is basically computer controlled. If the entire building has a power outage, someone will definitely notice it. If it is a regional power outage, you also heard Director An An say that she is very sure that no one has invaded other systems. But...

"

"But what?"

Tommy said, "Suppose you had to repair a light bulb in the tunnel. What would you do?"

"Turn off the light bulb." Yu Ming suddenly realized: "I understand that important power supplies, such as working power supplies, are controlled by computers. But the lighting power supply is still an ordinary switch. Your sister was frightened by his tone."

"Huh?" Tommy couldn't understand the last half of the Chinese sentence.

"It's Fake."

Tommy asked doubtfully: "Isn't Fake's mother?"

"Tommy, there are hundreds of word combinations that can be translated into Fake. If you just translate it, what I just said is your sister. But in Chinese, it means swearing."

"Then what do you call sisters?"

"..." Yu Ming said: "If we don't discuss this issue, let's go find the line."

As Tommy said, the lighting is not purely computer controlled. The computer can control the lights in the area to turn off. However, for the convenience of maintenance, there are also physical distribution boxes in the area. The distribution box on the 45th floor is on the side of the passage.

Approaching the safe passage, Tommy put on special glasses to check and nodded: "There are no fingerprints. You are right."

If there are no fingerprints, it means that the other party has wiped the switch.

Tommy asked: "But if someone discovers that there is a power outage in the corridor and goes to the distribution box to return the power, won't the thief be exposed?"
To be continued...