Xu Mang doesn't know anything about how to attack quantum communication, but he knows a truth, quantum communication cryptography cannot be cracked by mathematical methods, unless the quantum communication device is attacked by physical methods, so in the case of absolute security of the device, quantum communication has absolute confidentiality, in other words, it will never be leaked.

And in the notes of this top student, Xu Mang saw an unreasonable passage, using injection locking to crack quantum key distribution.

Under the analysis of the system, Xu Mang knew that this technology was a physical attack method, not a mathematical attack method, and used the mobile phone to find the concept of injection locking.

It turned out to be a quote from an irresponsible article written in a section of the MIT Technology Review, and this irresponsible article directly copied the article on attacking quantum communications in the preprint.

Preprints are manuscripts that have not been peer-reviewed, are not very valuable, have a world of credibility from traditional journals, and have a huge difference in quality.

Some articles do have a fairly high level, but they are waiting for review from traditional journals, and there are many articles that have a lot of problems and even some are unsightly.

Regarding the article about attacking quantum communication, Xu Mang also found it with his mobile phone, it was a certain team that built a prototype quantum cryptography optical path by itself, and then used injection locking to steal the information, so all of this is a preset situation, and it becomes a complete theft.

Xu Mang used his hacking knowledge to analyze the method of using injection locking to crack quantum key distribution, which is actually similar to the bypass attack in traditional hackers, playing crooked ways.

Like what

On the computer with the boot password, install a collector in the corner of the chip tube responsible for starting the computer, directly copy the boot instruction, and then put it again.

Another example,

Today's car ignition is an electronic lock, the original key is required to match the password, but under normal circumstances, some thieves directly chisel a hole, pull out the live wire, touch it and it's over, anyway, what the key does, is nothing more than the opening and closing of the two wires.

Of course

Xu Mang is not questioning the article attacking quantum communication, the article itself exists as an academic research, but it was distorted by some bad media, and then accidentally ignored by experts.

And Xu Mang just wants to tell Makarov that as long as something called an optical isolator can be installed, such a thing can be prevented, although there is imperfection in any device, but it is better to add it than nothing, at least the system tells itself to add an optical isolator.

however

Although he knows that the English name of optical isolator is optical isolator, there are many highly professional words in the middle, and Xu Mang is very stressed about it.

simply

Found this top student.

"Translation?"

"What are you going to translate?" asked the top student curiously, "I have average English." ”

"Just be better than me. ”

"I'm new to physics, and I don't know anything about it. Xu Mang said embarrassedly: "I found that Makarov may have been negligent and quoted the wrong content of an article, although this problem is no longer a problem, but it is difficult for me to accept the pursuit of perfection." ”

"What?"

"Error?"

The scholar looked at Xu Mang in surprise and questioned the authority... Is that really good?

Science is to question in order to progress, this truth is naturally understood by scholars, but in general, there is no corresponding strength, and questioning authority is very dangerous and stupid behavior.

"You..."

"Are you sure?" the top student confirmed.

"Yes!"

"Translate it for me. Xu Mang said with a smile.

The enthusiastic scholar nodded and said silently: "I am only responsible for translation, and I don't care about the rest." ”

"Oh..."

afterwards

Xu Mang and the enthusiastic scholar found Makarov, an expert in quantum hacking, and briefly recounted the problem, at first the bearded man was a little strange, and then realized that he had indeed misquoted the content of a certain report.

In fact

This mistake is harmless, but a mistake is a mistake, and Makarov is grateful for Xu Mang's correction.

"He's thanking you. ”

"Ask you... How are you... found this problem. The enthusiastic scholar Chong Xu Mang said.

"Oh..."

"You tell him. Xu Mang said indifferently: "I'm actually a hacker. ”

Words fall,

The warm-hearted scholar translated Xu Mang's words to Makarov.

"He asks you... Are you also a hacker who specializes in quantum communications?" said the enthusiastic Xueba.

"It's not. ”

"I'm a traditional hacker. Xu Mang said: "But I study physics myself, so I can try to be a quantum hacker, and disclose all the existing security vulnerabilities in the form of scientific papers to improve the standardization of quantum communication systems." ”

Enthusiastic scholar said to Makarov.

"He said you will succeed and that you will have the opportunity to work together in the future. The warm-hearted scholar said to Xu Mang.

“OK”

In the last sentence,

Xu Mang personally played, if he couldn't even say OK, then he might as well jump off the building.

It seems that Makarov, who is five big and three thick, Xu Mang didn't expect him to be so easy to talk to, generally speaking, foreigners are quite stubborn, at least Xu Mang thinks so, but there are also accidents.

Back to your seat,

Makarov continued his public classes.

And Xu Mang was searching for articles about attacking quantum communications, and he found that there were very few articles about attacking quantum communications, only few, and even most of them were published by this bearded Makarov.

Or...

"The system... What are the requirements to become a quantum hacker?"

[Identified by the system, the condition to become a quantum hacker, the host needs to have hacking skills, physical skills, and attributes - virtue, upgrade to two]

What the?

Still need to upgrade your attributes?

Is there something wrong with the morality of the buddy?

Xu Mang had doubts about himself, a genius who memorized the two crosses mantra in his heart, and was suspected by the system of having flaws in morality...

Saying... What kind of effect will it have if the virtue is upgraded to two?

Xu Mang, who has always been curious about the unknown, began to make his hands cheap.

Turn on the system,

Click on Properties – Virtue

[Whether to upgrade - Germany]

[Yes] [No]

Xu Mang confirmed again and again and chose yes.

Upgrade,

My moral bottom line!

A golden light,

Xu Mang saw that his attribute virtue had been raised to two levels.

View your own properties,

Virtue: Level 2 (Exclusive Skill: Conquer People with Virtue)

Intelligence: Level 3 (Exclusive Skills: Memory, Comprehension)

Body: Level 2 (Exclusive Skill: Beast Mode)

Beauty: Level 1

Law: Level 1

Upgrade card: 30

What's the situation?

And the skill of convincing people with virtue?

Xu Mang clicked on the skill option of convincing people with virtue.

Convince people with virtue: Some high-risk skills and use conditions will be unlocked, giving the host more powerful abilities, this skill is a permanent passive skill.

I'll go!

Labor and management have been fooled!

Nima...

Xu Mang was disheartened, he had worked hard, maybe he endured it for a year and a half, he collected one hundred and fifty upgrade cards, and then upgraded his intelligence to level four, who knows... This has to be chopped up!

High-risk skills... And partially.

Also

Without a high moral level, you can't be a quantum hacker, and it seems that Makarov's moral level is at least one level higher than his own.

"Classmates!"

"Professor Makarov is calling you. The kind-hearted scholar said to Xu Mang.

"What?"

"Call me?"

Xu Mang came back to his senses and looked at him with a confused expression: "Why?"

"Just now, Professor Makarov was lecturing on digital attacks and physical attacks, and he asked you to demonstrate the traditional methods of digital attacks. ”

"Oh..."Xu Mang nodded.

The next second,

Xu Mang walked to the front desk in full view of everyone, of course... and his personal translator, the warm-hearted scholar.

"He told you to attack the notebook. Xueba said.

"Oh..."

Xu Mang glanced at Makarov, saw him nodding at him, and hurriedly said to Xueba: "To what extent is the attack? completely paralyzed?"

soon

Xueba said, "Whatever you want." ”

With me?

This... Isn't that okay?

Xu Mang was stunned for a moment, it seems that this notebook is not expensive.

Getting a notebook, Xu Mang started to operate, but soon he found a problem, the other party's notebook is a little difficult to invade, and even quite cumbersome and complicated, it takes a little time.

Then

Makarov began to teach, he used the notebook as a quantum device, and Xu became the stealer.

It almost means that the content of quantum communication is stolen, and unless the laptop is snatched, it is impossible to steal any information through digital attacks.

subsequently

Makarov described the mode of operation of quantum communication in terms of secrecy, in fact, like traditional cryptography, through algorithms and keys, in fact, the algorithm of quantum communication cryptography is simpler than the traditional one.

Of course

The key is not in the algorithm, but in the key, in quantum communication, the key is N bits in length, and can only be used once at a time, and the next time the N bits are transmitted, the key is reconstructed.

The summary is N-bit length, randomness, and one-time, these three conditions are called disposable notes, which are absolutely impossible to decipher cryptographically, and this law was proved by Claude Elwood Shannon.

At last

Makarov explained a problem that the general public is very confused, quantum communication can only transmit keys, because quantum mechanics can only produce random characters, and the amount of information of random characters is zero, so it is impossible to use the quantum channel of quantum communication to transmit information.

In addition, he explained a lot of questions that the public wonders... For example, how to achieve key distribution is to use the two principles of quantum mechanics, the superposition principle and the measurement mutation principle, and how to know the information after having a key, which uses XOR encryption algorithms...

Of course it's coming to an end,

Makarov told all the students present that his notebook was constructed like quantum cryptography in defense, so Xu Mang's efforts would be useless.

But...

As soon as the words fell,

On the huge projector screen, a photo of Xu Mang's beautiful face in the prosperous era appeared.

“...”

“...”

“...”

it!

It's scared to death!

What's going on here?

Everyone present looked at the photo on the curtain with a confused expression, and it seemed that the people in the photo were somewhat familiar.

Wait a minute

Isn't that him?

At this point,

Everyone reacted and looked at Xu Mang in horror, didn't it mean that the digital attack was ineffective?

This...

How does this work?

Makarov was also surprised, glanced at Xu Mang, and then at his notebook.

"He asked you how you did it?" said the zealous scholar.

"His computer defense system is based on the existing code language, and can only imitate the form of quantum cryptography, but the core is still code..."Xu Mang shrugged his shoulders and said with great ease: "I found a loophole casually, and then went in." ”

Hearing the translation of the enthusiastic intestinal scholar, Makarov couldn't help but give Xu Mang a thumbs up.

subsequently

Makarov explained why Xu Mang was able to hack into the notebook, in fact, he copied Xu Mang's words and praised it casually.

After the public class,

Makarov asked Xu for his contact information.

meanwhile

There was a middle-aged man present who had a strong interest in Xu Mang, who was the director of the Department of Computer Science and Technology at Fudan University.

This guy,

Who is it?

......