Dark Light Chaser.

Chapter 505 NFC
The door locks used in school dormitories are the same as those in hotels, all electronic locks.

A few days ago, when Ai Liang went to the girls' dormitory to help Yi Wenna move her luggage, she specifically observed the brand and model of the electronic locks used on the stairwell doors and dormitory doors.

NFC electronic access cards are used for things like community gates, hotel rooms, and dormitory door locks.

With an NFC decoder and corresponding decoding software, cracking it is extremely easy; anyone can do it.

The access control at the main gate of the residential community is the simplest. It usually consists of an ID card with only a card number. You can just take a card from a resident and copy and paste it.

The entire process is incredibly easy to follow; if you can read, there's no chance of making a mistake.

The hotel's access cards are a bit more complicated. They are all simply encrypted, and you need to go to the front desk to reactivate them after leaving a certain area of ​​the hotel.

But if you want, you can still open a room, then use a decoder to crack the data in the room card, and then import the generated dump file into the white card.

This will allow you to obtain a copied room card.

Those with the ability can even hack into the hotel's database through the internal network and create a universal card that can open all rooms.

However, this kind of self-made universal card cannot be used for a long time. After using it twice, people will find that the program is abnormal and then block your card.

If there are any long-term needs, it's still the most convenient to just steal the cleaning service's universal card.

Of course, this refers to a regular hotel.

This tactic is ineffective against high-end hotels.

For example, in the East Wing of the Yichen Hotel, in addition to a room key, you also need to register your fingerprint and facial recognition. It is a pipe dream to think you can enter the room with just a room key.

Finally, there are student cards from Qianhua Experimental Middle School, or meal cards from other schools—these are cards that can hold money and have strong security.

Since money is involved, security cannot be lax.

However, the level of security is also linked to the level of importance the contractor attaches to it.

One scenario is that if a data conflict is detected, the most recent data will be used, rendering the copy card unusable.

This is considered quite advanced, with a comprehensive anti-theft system; most companies are willing to spend money on this.

Another type is where the card can be copied, but the database balance will show negative values. This is an old-fashioned system that is very easy to hack, and it's the cheapest system the company bought.

Give the simplest example.

You spent fifty yuan to get a water card, and then copied the data from it onto a blank card.

After spending the fifty yuan that was on the card, I took out the copied white card and continued using it.

The data on the white card is still the data from when it cost fifty dollars.

If the system displays "Invalid data on blank card," it indicates the former situation. In this case, conventional copying methods are ineffective, and a more advanced decoder is needed to crack the machine program.

However, if the copied white card can still be used, then it is the latter situation.

Although you can endlessly copy fifty-yuan water cards, their database keeps records.

Once the original fifty yuan is spent, the balance in the card's backend data will become zero. If you continue to use the copied white card, the balance will show as -50 and -100.

Anyone can tell you're up to something just by looking at your accounts, so don't even think about making big money by selling white cards.

If you encounter a more easygoing person in charge, they'll be magnanimous and forgive any minor transgressions. They'll update and upgrade the data, encrypt it again, and the matter will be over.

If you encounter someone who refuses to back down, they might call the police and have you arrested.

However, Ai Liang only borrowed Yi Wenna's student card to obtain the data file of the dormitory's electronic lock, so there's no need to worry about that.

Why doesn't Ai Liang use her own student ID card...?

Neither he nor Ye Qing were boarding students, so their data permissions regarding dormitory door locks were not imported.

Therefore, the only way is to copy Yi Wenna's student card data and compare it with your own student card. The extra part is the permission for the dormitory door lock.

Once the data is confirmed, Ai Liang will connect to the school's database to find similar files, and then import all the found file data into the white card.

In this way, he could use a single white card to open all the dormitory doors.

Peng Yuan used this method to open the electronic locks on Yi Wenna's dormitory door and the stairwell door.

As for the U-lock on the door, an experienced person could pry it open with a wire even with their eyes closed.

With padlocks and U-locks, once you practice your lock-picking skills, there's basically no difference between locking and unlocking them.

The movie features many impressive handcuff-picking and door-breaking actions.

Actually, if you buy a sample and practice more, you can do it too.

It's no exaggeration to say that if you give a locksmith a pair of pliers and a piece of metal, you can easily unlock lock cylinders for things like electric bikes, motorcycles, and handle-type wooden doors.

They can just glance at the keyhole and cut a key for you on the spot.

It's all about practice makes perfect.

Yi Wenna stared strangely at the computer in front of Ai Liang, and at the thing that looked like a charging pad.

"Are you planning to copy my student ID?"

Yi Wenna seemed a little hesitant: "But my student card can only open my dorm room, it can't go into that guy's dorm room."

"I just need a reference point."

Ai Liang withdrew her arm and sat back down in front of the computer, saying sternly, "Go get it right away."

Why are you being so fierce? Just take it!

Yi Wenna strolled out of the living room with small, quick steps, and returned a moment later with her student ID card held between her index and middle fingers.

She slammed her student ID card on the table: "Here you go."

Looking at the program running on the computer desktop, Ye Qing raised another question: "We can go into the dormitory now, but how do we check his computer? There shouldn't be anyone with a laptop that doesn't have a password these days, right?"

"And as you just said, Ah Liang, the other party is very likely to have the technology to remotely control computers. Wouldn't turning it on expose us?"

"Don't worry about that, cracking computer passwords is not difficult."

Ai Liang quietly watched the progress bar for deciphering the student card data: "As for remotely controlling the computer, I also have a solution."

Once I crack the student card, I'll create a simple high-frequency radio jamming device to block all electronic signals within a small area. As long as the power-on signal can't be transmitted, he naturally won't realize the computer is being used.

"High-frequency radio jamming device? Do you have the materials?" Ye Qing asked, resting her chin on her hand.

"Wait a minute! The key point is the raw materials?"

Yi Wenna pointed at Ai Liang and shouted, "Isn't the point more important why Ai Liang knows how to make that kind of thing than the raw materials?!"

Ai Liang ignored Yi Wenna's fuss: "Just buy some signal jammers online, take out some parts and modify them."

"Can you two please stop having such a serious discussion about these topics?!"

Seeing that Ai Liang was ignoring her, Yi Wenna became a little frustrated, but her complaints were still sharp: "If you've already bought a signal jammer, why not just use it directly? Why bother modifying it!"

(End of this chapter)