You can eat it but you are not allowed to miss it

Rest, can't even get out the door.With nothing to do, they could only stay up late and work overtime for several consecutive days, and they couldn't help yawning.After testing, the company really lost a large number of Bitcoin private keys.

Qin Fen, Nan Heqian's secretary, introduced to the boss who just came back to work: "Boss, this is the network security consultant sent by the technical department of the head office..."

Nan Heqian didn't look surprised, the corners of his mouth were raised slightly, always with a faint winner's smile, and he offered his right hand to the other party.Professor Zheng Yanning also passed his hand generously, but his face was so serious that there was no superfluous expression, and he didn't even bother to put on a disguise.The two held each other's hands, secretly wrestling with each other, and then quickly separated.

"The two know each other?" Secretary Qin was good at observing words and expressions, and seemed to have already seen some clues from their performance.

"Oh, yes, my wife's distant relative." Nan Heqian especially emphasized the three words "my wife".Zheng Yanning didn't respond, and continued to look at the computer screen.

Secretary Qin saw that Professor Zheng didn't talk to him, so he quickly smoothed things over and said, "relatives are even better! They are all from our own family, so you can trust them!"

"It's strange to say that Professor Zheng's powerful team came to attack our company's system, but they didn't find any loopholes that ordinary hackers can find!" Nan Heqian said with some sarcasm, "It can't be Professor Zheng Da's." The team’s skills are not good enough?”

Zheng Yanning didn't seem to be angry, but said: "This hacker is quite low-key, and he didn't leave any provocative words in the system. The purpose is simple and clear. He stole the private key and immediately transferred it away."

The reason why some hackers attack well-known company websites is purely to show off their technology. When they find a loophole, they will leave some words in other people's code, such as "XX came here for a visit".Some want to be eye-catching so that they can get admission letters from big companies.However, after all, hackers are not doing things in the light of day, even if they are grandstanding, they are still legally responsible.Obviously, this time the other party is not for the above purpose.Come and go without a trace, even the IT team of a well-known university has no clue how the hackers invaded?

"Mr. Nan, can I take a step to speak?" Zheng Yanning said abruptly.

"Come on, let's go to my office. Do you want coffee or tea? I'll go to the pantry to prepare it, and help everyone refresh themselves." Nan Heqian asked casually.

"Black Coffee, I'll go with you."

This is the first time that the two "rivals" have been alone together.Nan Heqian took Professor Zheng to the secluded tea room at the end of the corridor. Zheng Yanning thought he was just pouring a cup of ready-made black coffee from the coffee machine, but unexpectedly he took out a whole set of utensils from the cabinet and put them on On the table, there are bean grinding machines, siphon coffee pots, stirring rods, etc., and a new pack of Arabica coffee beans is opened.He scooped out the coffee beans one by one with a delicate, patterned spoon and put them into the grinder.

Zheng Yanning looked at his whole set of movements in puzzlement, wanted to ask but felt bored, so she held back.

"I want to ask why not just use the capsule coffee machine or order coffee? I usually do it when I am busy, but many of our employees think that the coffee outside is not strong enough, so we simply prepare beans in the office. Sometimes I am tired from work and come to cook. Once you make coffee, it’s a way to relax your nerves.” He adjusted the grind size and then pressed the button.

"Professor Zheng, do you like it bitter or light?" Nan Heqian asked.

"I can do it, just follow your habits."

"He likes thicker ones with milk, so you probably like them too?" Nan Heqian thought for a while and said.This "he" was of course referring to A Yu.

Zheng Yanning smiled wryly, he likes stronger black coffee, and A Yu also drinks thicker one, adding more milk, not because he likes bitterness, but for convenience, the two of them only need to make one pot.Now even the people who make coffee have changed, but still retain the habit.

Surrounded by the rich aroma of brewed coffee, Zheng Yanning felt that this kid didn't seem so annoying.He asked, "Have you ever thought about the ghost inside?"

"How is it possible?" Nan Heqian looked puzzled.

"I've heard a saying that what hackers rely on is not computer technology, but social engineering." Zheng Yanning said.

The so-called "social engineering", also known as "social engineering department".It can be roughly interpreted as a means of taking advantage of people's psychological weaknesses to obtain private information and steal money.Often when it comes to information security, it always focuses on the technical level, such as whether the system is strong enough, and whether hackers will find loopholes from the outside to break through, implant viruses, manipulate the system, and seek illegal benefits.

However, it is often overlooked that thieves don't necessarily need to slip through the door to pick the lock and smash your safe.He can also pretend to be the new neighbor next door.On a weekend, kindly serve homemade cupcakes and become friends with you.Maybe from the chats you have with each other, he knows a series of personal information such as your family status, hobbies, marriage and love affairs, etc., and screens out useful information from them, such as an ancestral Kangxi period antique hidden in your home Porcelain bottle.In the same way, it is not necessarily your security system that hackers breach, but your employees, or they may find ways to become your employees.

Zheng Yanning explained: "There is no sign of external intrusion into the system, so I guess there is the possibility of internal crimes."

"If you say that, the first thing I doubt is Professor Zheng!" Nan Heqian said bluntly.He has always adhered to the principle of "employing people without doubt, doubting people without using them".

Since everyone came together to start this company for a common ideal, Nan Heqian did not intend to doubt the loyalty and character of any old employee.Some technicians gave up the offers and high salaries of other big companies to join his little-known small company, step by step from poor to poor, Nan Heqian led his employees to work hard to make the current digital currency transaction The platform has experienced from the angel round to the A round and the B round of financing together.Finally made a profit, and opened a digital currency business and other financial businesses other than Bitcoin.As the first group of people to enter the industry, the company acquired a large amount of bitcoins at low prices through various channels. Now, as virtual currency is recognized by more and more people as a valuable financial product, the exchange rate of bitcoins against the US dollar The exchange rate has risen sharply, so the value of Nan Heqian and his company has also risen.

Unexpectedly, a long-lost smile finally appeared on Zheng Yanning's serious face: "That means you have the right idea! Goodjob!"

Nan Heqian asked suspiciously: "Don't you hate me? Why do you want to help me?"

Yan Ning frowned, and immediately said with a straight face: "Yes, but whether I hate you or not is not the same thing as my job! Besides, if you lose money, what good is it for me? The salary of a professor is not what the outside world imagines. The salary is so high, doing this consulting work can help me earn extra money, I have no trouble with money. Besides, you will only make my ex-wife's life miserable, and I don't want him to suffer with you while pregnant with a child!"

"Okay, then what should I do?" Seeing Yan Ning being so frank, Nan Heqian's original hostility also relaxed.Anyway, he doesn't believe there will be ghosts.He didn't have any other better solution, so he asked Professor Zheng to investigate freely.

"First, cut off all servers from the external network, save all bitcoin private keys on your personal computer and hard disk, and delete the original data from the company system. And set a password that can only be known by you alone, remember not to Networking! Second, conduct investigations on employees who may have access to core information throughout the company, and prevent anyone from contacting the outside world until the suspicion is cleared." Zheng Yanning said.

"Third, issue a solemn statement informing users that the website will be under maintenance and suspend all online transactions. This will definitely ensure the safety of users' property and stabilize people's hearts." Nan Heqian added.

But when it comes to the investigation, Nan Heqian is in trouble again. There is no suitable candidate here, so he can't come by himself, right?He looked at Professor Zheng, but he didn't expect that the two coincided with each other.Yan Ning said: "This matter must be presided over by an authoritative person, with a certain affinity, but it must also make employees feel awe."

"Can't you come?" Nan Heqian asked.

Zheng Yanning immediately declined: "I have enough authority, but not enough affinity. Neither can you. I have never seen a boss like you, and I still remember the preference of subordinates to help them make coffee. I guess it will not be easy for you to be really fierce. I am Can I recommend someone for you?"

"You said."

"What do you think of A Yu? The employees shouldn't dare to offend the lady boss, and they are not familiar with A Yu, and they don't know his temper. I think he is quite good at observing words and demeanor, and he is also good at talking with people." Yan Ning said.

Nan Heqian was a little hesitant. He actually held back for several days and didn't tell A Yu about the company's situation, because he was worried that the other party would think wildly and get angry.Now, he really hesitated to ask A Yu to help him solve his troubles.

"You don't trust his ability?" Yan Ning's words seemed to be doubtful and provocative, provoking Nan Heqian to admit that he didn't believe in A Yu's ability at work.

"Okay, but I'm going to ask him about his own wishes. He seems to be having trouble at home, too."

"Okay, then you have to decide quickly. We don't have much time." Zheng Yanning took the hot coffee that Nan Heqian handed him, took a sip, and even praised: "Your coffee making skills are quite good !"

"Professor Zheng, there is one more personal matter." Nan Heqian asked.

"You say. If I can help."

"Your university's recruitment of graduate students in September this year