After coming out of the company, Cheng Yu took a walk for a while. The summer in the city was as hot as a sauna.
However, sweating a little would help sober up. Although that little beer was not enough to drink, Cheng Yu was more or less drunk at this moment.
Not long after walking, Cheng Yu was sweating profusely, and the drunkenness had long since dissipated.
After hailing a taxi, Cheng Yu returned to the warehouse.
After entering, he locked the door and Cheng Yu went straight to the desk. The tablet was still placed on the table, and Cheng Yu took it in his hand.
After pressing the power button, the tablet screen did not light up as Cheng Yu imagined, but remained dark.
Cheng Yu thought he didn't press it properly, so he pressed it again, and it was still black.
After pressing several times in succession, the screen was still not lit. Cheng Yu suddenly realized that the tablet should have run out of power.
Well……
Cheng Yu was speechless, this was really a bit too recital.
Fortunately, in the past two years, whether it is a tablet, a mobile phone, or even a laptop, the charging ports have unified specifications and are no longer the same as before. Although the voltages vary, they are generally universal.
.
However, Cheng Yu didn't have a charger at hand. Although the tablet had been here for a long time, Cheng Yu had never opened it and used it, so it had always been powered, so Cheng Yu didn't think of charging it.
It’s about a charger.
Cheng Yu turned on his phone and wanted to see if there was any store selling chargers on the takeout list, but it was already close to midnight, so which store selling chargers would still be open?
After searching for a long time and finding nothing, Cheng Yu thought that there must be one in Taohuayuan Club, so he made a call.
Hearing Cheng Yu's voice, the Taohuayuan Club said they would send someone a charger immediately. Shortly after Cheng Yu hung up the phone, there was a knock on the big iron door outside.
Cheng Yu opened the door, and standing outside the door happened to be the waiter whom Cheng Yu asked for a club room a few days ago.
Seeing that he was an acquaintance, Cheng Yu smiled and greeted him in. The waiter was a little frightened and said that he had to go back to get his life back. Cheng Yu said, "Don't worry, and you have to wait for me to try to see if the charger works."
Ah, although the interfaces are the same, if the battery fails to charge, I have to call again."
After hearing this, the waiter walked in.
After Cheng Yu entered the warehouse, he connected the charger to the tablet, and naturally placed the USB drive aside.
After just a few minutes, the tablet's screen finally lit up, showing a picture of a charging battery.
Cheng Yu turned on the phone smoothly, but when the boot animation passed and he finally came to the desktop, Cheng Yu found that the tablet was still locked by a password.
This is a little puzzling. After all, when the program in the USB flash drive was executing the unlocking program, the screen was always on. Then Cheng Yu took a look when he passed by and found that the screen was indeed dark at that time. But now
Cheng Yu couldn't tell whether the black screen state at that time was caused by unlocking the tablet, or whether the tablet was directly out of power.
But now that he saw that the tablet did not seem to be unlocked and was still tightly locked with a password, Cheng Yu wondered if it was actually out of power just now, but he mistakenly thought that it had been unlocked successfully?
After thinking about it, Cheng Yu thought it would be better to ask Xiao Nie.
He immediately sent a message to Xiao Nie. Although it was already past midnight, Cheng Yu already knew Xiao Nie's routine very well. He didn't go to bed at twelve o'clock when he had a girlfriend. Now he is single again.
State, I'm working overtime tonight to formulate technical systems, it's definitely impossible to go to bed so early.
Cheng Yu: Come out.
Sure enough, Xiao Nie replied almost instantly: Mr. Cheng is not asleep yet.
Cheng Yu: After unlocking your unlocked USB flash drive, will the tablet screen automatically turn off?
Xiao Nie: No, if it is unlocked, the screen will remain on. And if you press the lock screen button now, when you open it again, you must use the USB flash drive to unlock it again.
Cheng Yu was stunned and replied: So, if the screen suddenly goes black during the unlocking process, does it mean that the tablet is out of power?
Xiao Nie: That’s for sure, the screen cannot be black when unlocking.
Perhaps because he felt it was a bit troublesome, Xiao Nie simply made a voice call: "Mr. Cheng, what's going on?"
Cheng Yu said helplessly: "I forgot that I haven't used this tablet for a long time, and the battery is probably not that full. After I plugged in your USB flash drive, it started automatically, and then I waited for a long time, wondering what to do.
Went there. At about eight o'clock, I took a look and saw that the screen was black. I thought it was because after the unlock was successful, your USB flash drive program no longer worked, and the screen naturally turned off. But now since you said after unlocking
The screen will remain on, which means the battery will run out before the lock is unlocked."
"That's not necessarily the case. It may be that after unlocking, the screen was always on, which consumed more power, and then finally ran out of power. To be honest, I said it would take a day or two to unlock if you are unlucky, but that is an extreme situation.
. Generally speaking, it is actually two or three hours at most. After all, the passwords set by ordinary people are most likely to be either all numbers or all letters. Even the mixture of letters and numbers is relatively rare, and most of them only know how to
Enter the minimum number of digits required by the system, which is usually six to eight digits. Most likely it won’t take that long. If you judge based on this, you glanced at it after eight o’clock, but you sent me the message only after five o’clock.
, most likely it was already unlocked, and then the screen was locked because the battery was out of power.”
"But now that I've charged it, it still asks me to enter my password after turning it on." Cheng Yu continued to ask.
Xiao Nie laughed twice and said: "Uh... Mr. Cheng, when I gave you the USB flash drive, didn't I explain it to you? The program in the USB flash drive will first disguise itself as a visitor, thus bypassing its security.
Rules, that is to say, it works under the cover of security rules. Only in this way can it not be limited in the number of incorrect inputs. Otherwise, if you manually try to brute force it, it will be as little as three times and as many as ten times.
times, the tablet is locked, and it takes a long time to unlock it again. During this period, even if you have the password, it is useless. Therefore, even after the password is broken, the USB flash drive must be inserted in
On the tablet, as soon as it is unplugged, the disguised guest account will appear in the logged-out state, and the tablet will automatically return to the locked state, and you will still be unable to enter."
Cheng Yu was stunned and said: "You mean, even if the lock is unlocked, I have to keep the USB flash drive plugged in? But the power of this tablet is limited, and I don't know how to crack it.
How long does the program take? That means I have to keep an eye on it and read the content as soon as it is unlocked. As long as the content is slightly complicated, I cannot read it completely, and I have to recharge and re-decode it after it is finished?"
On the other end of the phone, Xiao Nie was obviously stunned and didn't say anything for a long time, as if he was stopped by Cheng Yu's question and didn't know how to answer.
On the contrary, the waiter next to Cheng Yu could not hear Xiao Nie's words, but from Cheng Yu's words, he could probably tell what kind of problem Cheng Yu was encountering now.
So, he opened his mouth and said: "Well, Mr. Cheng, do you think that this tablet only has one data interface, so if you plug in a USB flash drive, it cannot guarantee the power. After charging, the data in this USB flash drive will
The program won’t work again?”
Cheng Yu glanced at him, nodded, and said, "Yes, isn't this a contradiction?"
The waiter scratched his head and said with some cringe: "Actually, we only need a hub to solve this problem."
Cheng Yu's face was full of astonishment. He had no idea what the waiter meant by hub. He said, "Speak in human terms."
The waiter said: "It's similar to the kind of wiring board used at home. If the power sockets are not enough, just get a wiring board. Then there are many power sockets on the wiring board, so you can drive several electrical appliances at the same time..."
"Does this thing also have a wiring board?" Cheng Yu looked confused.
The waiter nodded helplessly and said: "Yes." But he was thinking in his heart, maybe this young master Cheng just connected to the Internet cafe and the hub doesn't know about it?
Cheng Yu really didn't know. First of all, he was not keen on electronic products. Over the years, apart from computers and mobile phones, he had never bought any other digital products. This also led to the fact that his mobile phone interface had never been used.
To charge, the various interfaces on the computer are basically just for plugging in a USB flash drive, and two USB flash drives are almost never plugged in at the same time. Those data interfaces are always wasted. Therefore, the process
Yu doesn't need a hub at all, so naturally he doesn't know that such a thing exists in the world.
Xiao Nie, who heard the waiter's words on the phone, finally understood what the problem was. He is a computer expert and a digital geek. He has a lot of digital products at home, and almost everything needs to be connected to the computer with a data cable.
, so when he buys a computer, he must first consider the number of interfaces, and even if the number of interfaces is sufficient, he still needs to use a hub. Therefore, in his opinion, hubs should be known to all people on earth, and he has absolutely no idea about them.
After turning this corner, I never expected that there would be a human like Cheng Yu in this world that even the Hub had never heard of.
"I thought this was common sense, but I didn't expect that for you, Mr. Cheng, this was the last additional question in the Mathematical Olympiad. Well, it was my fault. I ignored that most people in this world are actually digital novices.
Mr. Cheng, your friend is very right. At this time, you only need one hub to solve all the problems."
Cheng Yu felt a little ashamed, laughed twice awkwardly, and said, "Okay, it's okay, I'm done."
Then, he looked at the waiter in front of him and said, "Do you have a hub?"
The waiter nodded and said, "Yes, but I have to go back and get it at home. Are you in a hurry? If you are not in a hurry, I will buy one for you and bring it over tomorrow."
Cheng Yu also nodded and said succinctly: "Yes, it's urgent."
The waiter said: "Then I'll go ask the manager for leave first..."
Cheng Yu waved his hand and said, "You just go back and get it, take a taxi, and I'll reimburse you for the cost. I'll say hello to you at the club and tell you that I'm looking for your help and I'll get off work early tonight."
The waiter left the warehouse immediately without saying anything. This kid was quite discerning. Since Cheng Yu said it was urgent, he treated the matter as urgent.
Cheng Yu, on the other hand, made another call to the manager of Taohuayuan Club, saying that he wanted the waiter to help with something. The manager immediately said that the waiter had already got off work. Cheng Yu praised him for being sensible,
Then hung up the phone.
Half an hour later, the waiter came back with the hub.
