Chapter 216

Xu mang doesn't know how to attack quantum communication, but he knows a truth. Quantum communication codes can't be cracked by mathematical methods, unless the quantum communication equipment is attacked by physical methods. Therefore, when the equipment is absolutely secure, quantum communication has absolute confidentiality, in other words, it will never leak secrets.

In this Xueba's notes, Xu mang saw an unconventional paragraph and used injection locking to crack quantum key distribution.

In the system analysis, Xu mang knows that this technology is a physical attack means, not a mathematical attack means, and uses the mobile phone to find the concept of injection locking.

It was originally quoted from an irresponsible article written in a column of "MIT Technology Review", and this irresponsible article directly reproduced the article on attacking quantum communication in the preprint.

The so-called preprint is a manuscript without peer review, its value is not very high, and there is a huge gap in credibility with traditional journals, and there are also huge differences in quality.

Some articles do have quite high level, but they are waiting for the evaluation of traditional journals. There are also many articles with many problems, even some of them are ugly.

Xu mang also found the article about attacking quantum communication with his mobile phone. It was a team that built a prototype quantum cryptography optical path and then used injection locking to steal the information. Therefore, all of these things are pre-set and become the completion of theft.

Xu mang uses hacker knowledge to analyze the way of using injection locking to crack quantum key distribution. In fact, it is similar to the bypass attack in traditional hackers.

For example,

on a computer with a power on password, install a collector in the corner of the chip tube responsible for starting the computer, directly copy the boot command, and then play it again.

For example,

today's car fires are all electronic locks, which require the original key to put on the password. However, under normal circumstances, some thieves directly cut a hole, pull out the fire wire, and touch it to finish. Anyway, what the key does is nothing more than the closing of two wires.

Of course,

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

Xu mang wants to tell Makarov that as long as you install something called an optical isolator, you can prevent such a thing. Although any device has imperfections, adding it is better 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 professional words in the middle. Xu mang is under great pressure.

Simply,

found this Xueba.

"Translation?"

"What are you going to translate?" The Xueba asked curiously, "my English level is average."

"Better than me."

"I've just come into contact with physics, and I don't understand it." "I found that Makarov may have been negligent and quoted a wrong article. Although this problem is no longer a problem, it is difficult to accept the pursuit of perfection of my performance," Xu said awkwardly

"What?"

"Wrong?"

This Xueba looks at Xu Mang in surprise, questioning authority... Is this really good?

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

"You..."

"are you sure?" Xueba, make sure again.

"Yes

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

"I'm only responsible for translation, but I don't care about the rest," he said quietly

"Oh..."

after that, Xu Mang and the enthusiastic enterology bully found Makarov, a quantum hacker expert, and described the problem briefly. At first, the bearded man was a little strange, and then he found that he had misquoted the content of a certain report.

In fact,

this mistake is harmless, but mistakes are mistakes. Makarov is very grateful for Xu Mang's correction.

"He's thanking you."

"Ask you... How did you... Discover this problem." Enthusiastic intestinal learning Ba Chong Xu mang said.

"Oh..."

"you tell him." Xu mang calmly said: "I am actually a hacker."

In the end, he translated Xu Mang's words to Makarov.

"He asked you... Are you also a hacker specializing in quantum communications?" Warm hearted intestinal learning Ba said.

"No

"I'm a traditional hacker." "But if I study physics myself, I can try to be a quantum hacker and make all the existing security vulnerabilities public in the form of scientific papers, so as to improve the standardization of quantum communication systems," Xu saidSaid Makarov.

"He said you will be successful and have the opportunity to work together in the future." He said to Xu mang.

"OK"

in the last sentence,

Xu mang went on the stage in person. If he can't even say OK, he'd better jump off the building.

It seems that Makarov is a big five, but Xu mang didn't expect him to be so talkative. Generally speaking, foreigners are very stubborn. At least Xu mang thinks so, but there are also accidents.

Back at his seat,

Makarov continued his open class.

While Xu mang is searching for articles about attacking quantum communication, he finds that there are few articles about attacking quantum communication, and even most of them are published by the bearded Makarov.

Or...

"what are the conditions for a system... To become a quantum hacker?"

[after system identification, the condition for becoming a quantum hacker is that the host needs to have hacker skills, physical skills, and the attribute - De, upgraded to two]

what?

Also need to upgrade properties?

Is there something wrong with your friends' moral standards?

Xu mang has doubts about himself. A genius who has memorized the twenty word truth is systematically suspected that there are defects in morality and Taoism?

Xu Mang, who has always been curious about the unknown, began to be cheap.

Open the system,

click the attribute - de

[upgrade - de]

[yes] [no]

after repeatedly confirming, Xu mang selected yes.

Upgrade,

my moral bottom line!

With a golden light,

Xu mang saw that his attribute virtue had been promoted to two levels.

Check your own attributes,

Virtue: Level 2 (exclusive skills: virtue to convince people)

wisdom: Level 3 (exclusive skills: memory ability, understanding ability)

Body: Level 2 (exclusive skills: animal mode)

beauty: Level 1

labor: Level 1

promotion card: 30

what is the situation?

What's more, the ability to win people over by virtue?

Xu mang points to open the ability to convince people with virtue.

Win people by virtue: it will unlock some high-risk skills and use conditions, and endow the host with more powerful ability. This skill is a permanent passive skill.

I'll go!

Labor and capital have been cheated!

Nima...

Xu mang was so frustrated that he had worked hard and endured for a year and a half. He collected 150 upgrade cards and then upgraded his intelligence to level 4. Who knows... This has to be cut off!

High risk skills... What's special is the part.

Also,

without a high moral level, he can't be a quantum hacker. It seems that Makarov's moral level is at least one level higher than his own.

"Classmate!"

"Professor Makarov is calling for you." The kind Xueba said to Xu mang.

"What?"

"Call me?"

Xu mang came back to his mind and looked at him with a look of Stupidity: "why?"

"Professor Makarov was just talking about digital attack and physical attack. He asked you to demonstrate the traditional digital attack method," the Xueba said

"Oh..." Xu mang nodded.

The next second,

Xu mang walked to the front desk in full view of the public. Of course, there was also his personal translator, the warm-hearted Xueba.

"He asked you to attack this laptop." Xueba said.

"Oh..."

Xu mang glanced at Makarov, saw that he nodded to himself, and said to Xueba in a hurry: "how far is the attack? Completely paralyzed? "

Soon,

Xueba said, "whatever you want."

Follow me?

This... This is not good?

Xu mang Leng for a moment, it seems that this notebook is not expensive.

After getting a notebook, Xu mang starts to operate, but soon he finds a problem. The other party's notebook is difficult to invade, even rather cumbersome and complex, which needs a little time.

At this time,

Makarov started teaching. He used the notebook as a quantum device, and Xu mang became a thief.

It almost means to steal the content of quantum communication. Unless you take away this notebook, it is impossible to steal any information by means of digital attack.

Subsequently,

Makarov described the operation mode of quantum communication in terms of confidentiality. In fact, like the traditional cryptography, the algorithm of quantum communication cryptography is more simple than the traditional cryptography through algorithm and key.

Of course,The key lies not in the algorithm, but in the key. In quantum communication, the length of the key is n bits and can only be used once at a time. When the next transmission, the n-bit key will be reconstructed.

The conclusion is n-bit length, randomness and one-time. These three conditions are called one-time notes, which are absolutely impossible to decipher in cryptography. This law was proved by Claude Elwood Shannon.

Finally,

Makarov explained a confused problem of the public. Quantum communication can only transmit key, because quantum mechanics can only produce random characters, and the information quantity of random characters is zero, so information can not be transmitted through quantum channel of quantum communication.

In addition, he explained a lot of questions that the public were puzzled about... For example, how to realize key distribution is to use the two principles of quantum mechanics, superposition principle and measurement mutation principle, as well as how to know the information after the key is available, which uses XOR encryption algorithm...

of course, it will end soon,

Makarov said to all the students present that his note Ben took the same structure as quantum cryptography in defense, so Xu Mang's efforts will be useless.

But...

just after the voice dropped,

on the screen of the huge projector, there appeared a beautiful picture of Xu Mang in the flourishing age.

"..."

"..."

"

"... "

horizontal trough!

It's frightening!

What's the special situation?

All the people on the scene looked at the photos on the screen. How could it seem that the people in the photos were familiar.

Wait a minute,

that's him!

At this point,

everyone reacts and looks at Xu Mang in horror. Isn't it that the digital attack is invalid?

This...

how does this work?

Makarov was also surprised. He took a look at Xu Mang and his notebook.

"How did you do it?" he asked Warm hearted intestinal learning Ba said.

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

Hearing his translation, Makarov couldn't help but give Xu mang a thumbs up.

Then, Makarov explained why Xu mang could invade the notebook. In fact, he copied Xu Mang's words and praised them casually.

After the open class,

Makarov asked Xu mang for his contact information.

At the same time,

there was a middle-aged man who was interested in Xu mang. He was the director of computer science and Technology Department of Fudu.

Who is this guy,

?

......

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