The Monster I Was Redeemed

The locks used in school dormitories, like hotels, are all electronic locks.

A few days ago, when he went to the girls' dormitory to help Yiwenna carry her luggage, Ai Liang specifically observed the brand and model of the electronic locks used on the stair doors and dormitory doors.

Such as community gates, hotel rooms, dormitory door locks... these are all NFC electronic access cards.

As long as you have an NFC decoder and the corresponding decoding software, it is quite easy to crack it, as long as you have the skills.

Among them, the access control of the community gate is the simplest. It is usually an ID card with only a string of card numbers. You can directly pick up a card from the resident of the community and copy and paste it.

The whole process is fool-proof, so if you can read, there is no possibility of making a mistake.

The hotel's key card is a little more complicated. The key card is simply encrypted. After leaving a certain area of ​​the hotel, you need to go to the front desk to reactivate it.

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

This will give you a duplicate room card.

Those who are capable can also hack into their database through the hotel's internal network and make themselves a universal card that can open all rooms.

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

If there is any long-term need, it is most convenient to directly steal the cleaning universal card.

Of course, this refers to general hotels.

For those special high-end hotels, this method is useless.

For example, in the east area of ​​Yichen Hotel, in addition to a room card, you also need to register fingerprints and face recognition. It is completely impossible to enter the room with just a room card.

Finally, there is the student card of Qianhua Experimental Middle School or the meal card of other schools. This type of card can save money and has strong security.

After all, money is involved, and security cannot be lax.

However, the security level is also linked to the attention paid by the contractor company.

One is that if a data conflict is found, the most recent data will prevail, causing the copy card to become unusable.

This kind is relatively advanced and has a complete anti-theft system. Normal companies are willing to spend money on this.

The other is that the duplicate card is available, but the amount in the database will have a negative value. This is an old-fashioned system, which is extremely easy to be hacked. It is the cheapest system purchased by the company.

Take the simplest example.

You spend fifty yuan to get a water card, and then copy the data inside to a white card.

After the fifty yuan stuck on the card is spent, take out the copied white card and continue using it.

Because the data in the white card is still the data when it was fifty yuan.

If the white card invalid data is displayed, it is the former situation. In this case, ordinary copying methods are useless, and a more advanced decoder is required to crack the machine program.

But if the copied white card can continue to be used, it will be the latter situation.

Although you can unlimitedly copy a fifty-yuan water card, other people's databases are for accounting purposes.

After the original fifty yuan is spent, the background data balance of this card becomes zero. If you continue to use the copied white card, data of -50 and -100 will appear.

People will know you have a problem just by looking at your account, so don’t try to make a lot of money by selling white cards.

When I met a person in charge of the Buddhist system, he did not remember the faults of the villain, updated the data, and encrypted it again, and the matter was over.

If you meet someone who refuses to suffer, they will call the police and arrest him.

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

Why doesn't Ai Liang use his student card...

Neither he nor Ye Qing were dormitory students, and the data permissions regarding dormitory door locks were not imported.

So the only way is to copy the data of Yiwenna's student card and compare it with his own student card. The extra part is about the permissions of the dormitory door lock.

After confirming the data, 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 can use a white card to open all dormitory doors.

That Peng Yuan used this method to open the electronic locks of Yiwenna's dormitory door and stair door.

As for the U-shaped lock added to the door, an experienced hand can pry it open with a wire with eyes closed.

For things like padlocks and U-shaped locks, if you practice more lock picking skills, there will be basically no difference between locked and unlocked.

There are a lot of awesome actions in the movie about opening handcuffs and breaking open doors.

In fact, you can still do it if you buy samples yourself and practice more.

It is no exaggeration to say that the locksmith is given a pair of scissors and a piece of iron, such as lock cylinders for electric cars, motorcycles, and handle-type wooden doors.

Just by looking at the keyhole, they can cut a key for you on the spot.

It's all practice makes perfect.

Yiwenna looked at the computer in front of Ai Liang with a strange expression, which was similar to the charging pad.

"Are you going to copy my student card?"

Yiwenna seemed a little hesitant: "But my student card can only open my dormitory, but I can't enter that guy's dormitory."

"I just need a reference."

Ai Liang retracted his arm and sat in front of the computer again and said seriously: "Hurry and get it."

Whatever you want, just take it!

Yiwenna walked out of the living room with small steps, and soon came back with her student card between her index and middle fingers.

She slapped her student card on the table: "Here."

Looking at the programs running on the computer desktop, Ye Qing raised another question: "You can enter the dormitory, but how to check his computer? There should be no one who doesn't set a password on his laptop now, right?"

Moreover, Ah Liang, you just said that the other party is very likely to have the technology to remotely control the computer. Wouldn't it be exposed as soon as it is turned on? "

"Don't worry about that, it's not difficult to crack the computer password."

Ai Liang quietly looked at the progress bar of deciphering the student card data: "In addition, I also have a solution to the problem of remote control of the computer.

After cracking the student card, I will make a simple high-frequency radio jamming device to block all electronic signals within a small range. As long as the power-on signal cannot be transmitted, he will naturally not notice that the computer is being used. "

"High-frequency radio interference device? Do you have the materials?" Ye Qing asked, holding her chin with one hand.

"Wait a minute! The focus is on raw materials?"

Yiwenna pointed at Ai Liang and shouted: "Compared to the raw materials, why Ai Liang made that kind of thing is more important, isn't it?"

Ai Liang ignored the fussing Yi Wenna: "Buy some signal jammers online, take out some parts and modify them."

"Can you two stop discussing these topics seriously!"

Seeing that Ai Liang ignored her, Yiwenna went a little crazy, but her complaints were still sharp: "I bought a signal jammer, so why do I need to modify it if I can just use it?"

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