data repair

These two consecutive lessons are "Computer Basics", which can be regarded as an entry-level course.

Guan Dacheng is only responsible for explaining the structure of computer hardware to the students.However, what is different is that Guan Dacheng seldom follows the script in his lectures, and he will ask some questions for students to think about in class from time to time.

Before pointing to Yuxing, Guan Dacheng actually called two students to answer a few simple questions. In the question and answer room, the students also had a deeper understanding of the basic structure of the bare metal, such as bois, such as cpu, Another example……

In fact, today's class has come to an end, Guan Dacheng just wanted to call another classmate to get up and summarize what he taught, and then it's over.I never thought about it, this whole thing came out...

Calling Jin Yuxing's name, the first yell was no, the second yell was no, and the third yell was still no one answered, even a teacher should be so angry.

Sure enough, the bad luck guessed by a classroom of smart people fell on Yu Xing.

"Jin Yuxing, since you agreed, please answer my question!" Guan Dacheng said with a smile.However, anyone could tell that his smile was cold.

Without waiting for Yuxing's response, Guan Dacheng continued: "Actually, computers, hardware and software complement each other... Then I want to ask this classmate Jin, do you think this bois is hardware? Or software?"

Yuxing was taken aback when he heard this, and said, "bois is a program, I think it should be software?"

Guan Dacheng sneered slightly, and was noncommittal to this answer, but said: "It seems that this student is quite proficient in computers, he even knows that software is a program!"

Of course Yu Xing could hear the irony in his words. He glanced around at the lively classmates with interest, and said bravely: "It's not proficient, just a little bit, a little bit!"

"Since you know software, it's easy!" Guan Dacheng looked surprised, "Then I'll ask you a few questions about software! After all, you said just now, 'You know everything about hardware, but you know half about software'." !"

Yu Xing was dumbfounded, and thought to himself: "You are too good at tnd!" But he didn't dare to say that, he could only say in embarrassment: "Then please teach me, Teacher Guan!"

"I don't ask any difficult questions..." Guan Dacheng said, "You should know about the firewall!"

However, as soon as he said this, the whole class resonated in their hearts: "The professor calls a beast because he has thick skin!"

"Ah... I've heard of it, and I know a little bit about it." Yu Xing replied.

Jin Yuxing knows a thing or two, just knowing that the 'firewall' is a program.

"That's good..." Guan Dacheng said, "Then talk about your views on the firewall!"

Hearing this question, Yu Xing was stunned.This question is quite vague, it's just a mouse pulling a turtle without knowing what to say!Besides, even if he said he was ugly, his opinion might not necessarily be Guan Dacheng's!

"This……"

"Why? Can't answer?" Guan Dacheng said, "Let me give you some hints! You can talk about your knowledge from the two aspects of firewall construction and cracking! If you can't answer again, then my course can only be regarded as You failed!"

These words caused more than half of the students in the class to show gloating expressions, and a small half gave Yu Xing sympathetic eyes.

Yu Xing also understood that Guan Dacheng's fangs finally came out, but he couldn't stop.However, he really didn't know anything about firewalls. After thinking about it, Yu Xing felt that he could only make up nonsense.

Fortunately, the hijacker who claimed to be a 'gun expert' was an expert in unlocking everything from drawer locks to security doors to bank vault gates, as long as he was given time, he could open them.Right now, his lockpicking skills are all in Yuxing's mind.

Yuxing has never eaten pork, but he has seen pigs running. Although he doesn't know much about firewalls, he also knows that this thing is almost equivalent to an anti-theft shell for computer data.

If Guan Dacheng writes a firewall for the school, Yu Xing may not be able to, but in the current situation, Yu Xing can only rely on the firewall with the theoretical students about "locking" rigidly, and randomly do two things. In other words, maybe I can get away with it.

So, Yu Xing sorted out his thoughts a little bit, and started to boast under the gaze of Guan Dacheng: "Actually, this firewall, for computers, is similar to the anti-theft door in our house..."

Just one sentence, just one sentence, Yu Xing said so that the whole class was dumbfounded, wanting to laugh but not daring to laugh.

On the other hand, Guan Dacheng was startled, aroused another thought, paused, and said: "Continue, you continue to talk..."

Now, those students who wanted to laugh out loud couldn't help but shut their mouths.

"Just like the anti-theft door, the firewall program has a back door for users to access. Of course, this requires a password, just like the anti-theft door needs a key to open it! For illegal intruders who want to crack the firewall , the best way is to get the key, of course, this kind of idealized situation is not uncommon, but it is very rare..."

Although the students in the class were all freshmen from the Department of Computer Science and knew little about firewall programs, they could easily understand what Yu Xing said, and found it intriguing.

"Since it is rare to get the key, bypassing the firewall has become the main means of cracking..."

"Won't someone just smash the door?" At this moment, a girl wearing glasses stood up and asked in the back row.

Yu Xing glanced at Guan Dacheng, seeing that he had no objection, so he turned around very cleverly, smiled at the girl, and said: "Although the shape of each anti-theft door is different, the quality of the boards is similar. , The firewall is the same, if you want to break through the plank and enter directly, wouldn't that be a robbery? The movement must be too loud, and it will immediately attract people's attention!"

"That's right..." The girl was taken aback for a moment, then sat down a little blankly.

"So, the topic is back again, bypassing the firewall, but how to bypass it? To be honest, everyone's coding habits are more or less different, just like the anti-theft door installed in your home, although the anti-theft door comes with a built-in The door frame, but these door frames rarely fit tightly with the outer wall frame, those small gaps are where we break through, we can completely pry the door frame, and when it is loose..."

"Student Jin, please be more specific, for example?" Another classmate interrupted Yu Xing to ask.

"For example, let's take a large database!" Yu Xing said, "Some people wrote the database code, and some people wrote the firewall installed outside it. Then there is one of them." The problem... For the definition of some variables, there will be subtle differences between the two programs, such as the difference in floating point numbers... This difference may be nothing in the eyes of ordinary people, but in the eyes of experts, That's a leak!"

Yu Xing's words fell into the ears of his classmates as something novel, but into Guan Dacheng's ears, they became a key, a key to open his mind.

Seeing Yu Xing talking eloquently, Guan Dacheng really wanted to stop, but he couldn't hold back his face. It just so happened that the bell rang for the end of get out of class.

Guan Dacheng said: "Okay, Jin Yuxing, that's it for today! This time you pass the test, and the next one is not an example!" He said, and he began to tidy up the lesson plans on the podium.

When Yu Xing heard this, he immediately breathed a sigh of relief.

But there were also a small group of students who were quite slanderous about Yuxing's easy escape from Guan Dacheng's anger, cursing in their hearts.

Guan Dacheng picked up the lesson plan and started to leave. At the end, he added another sentence: "Jin Yuxing, you didn't say anything about the firewall construction just now. After you get down, write a paper and hand it over to me!"

Upon hearing this, the group of people immediately burst into joy and became very balanced.

For Guan Dacheng's request, Yu Xing had to fulfill it.So, when he went back to 303, he had a sad expression on his face.

It just so happened that Xiao Ne also came back from get out of class, walked to the door of the dormitory, saw Yu Xing, and joked, "Third brother, what's the matter? Someone exploded!?"

"You're the one who blows people up..." Yu Xing countered, and added, "It's all up and down!"

Xiao Nie was speechless for a while, and finally choked out a sentence: "Third brother, you are indeed much more evil than me!"

Opening the bedroom door, Yu Xing yelled as soon as he entered: "Xiao Jin, Xiao Jin, where did you die?"

"Stop barking, third brother, I haven't seen your pet snake since last night!" Xiao Nie said.

As soon as the words were spoken here, Xiaojin shot out from an unknown corner and wrapped around Yuxing's left arm.

"You son of a bitch, you have been training for so many days, you are playing wild! You don't know where you are now?" Yu Xing was dissatisfied and afraid of hitting Xiaojin on the head.

Xiao Jin dodges aggrievedly, not daring to resist a little bit.

Xiao Ne couldn't stand it any longer, and said, "Third Brother, if I had a pet snake as intelligent as Xiao Jin, I would never want to hit it." While talking, he turned on the computer and started to do his own business.

Seeing that someone was helping it to speak, Xiao Jin immediately raised his upper body and nodded frequently.

"Have you got fat?" Yu Xing made a gesture to hit him again, and Xiao Jin quickly fled under the bed.Not long after, it poked its head out again and swayed towards Yuxing.

Yu Xing grabbed it, leaned close to his eyes, and said, "Tell me, where have you been all these days?"

As soon as he mentioned this, Xiao Jin's eyes flooded immediately, and he twisted and twisted desperately, as if he wanted to go somewhere.

Yu Xing quickly put it on the ground, and Xiao Jin jumped out immediately.Yu Xing hurriedly followed: "Youngest, let me go out for a while!"

"Go! I'll pack a box lunch for you later!"

"Okay!"

Xiaojin slid out of the 28th floor along the corner of the wall, leading the way ahead, and it turned back from time to time to see if Yuxing was following.

Yuxing's current limit speed is almost three times that of Xiaojin, so it is very easy to follow.

Before he knew it, Yu Xing followed Xiao Jin to a remote dense forest by the lake.

After passing through a grass cage half the height of a person, Xiao Jin stopped.

"This is where you want to bring me?" Yu Xing asked.

Xiao Jin nodded repeatedly.

"There's nothing here! There are fallen leaves everywhere, doesn't it look like someone has been there?" Yu Xing wondered.

Xiao Jin bounced up on the spot, repeated several times, and then ran forward with the snake's head, making a vivid 'sniffing' movement.

Yu Xing understood it, and immediately let go of his five senses, and his sense of smell became hundreds of times more sensitive in an instant.

"Suck—" Mobbing his nose, Yu Xing's expression changed suddenly: "It stinks! This is... the smell of a dead person!?"

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