"If, I mean if." Amor thought for a while and said, "If you use the RSA method for key encryption in the exchange of information, as the attacker, if it were you, what methods would you use to attack?" Or how would you attack? ”

This problem is not a problem for Junxin, after all, there are countless ways to attack the RSA algorithm in later generations. Attacks are carried out by bypassing RSA attacks when random numbers are generated, stealing keys at the time of key distribution and then communicating in both directions. There are other methods such as time attacks, modulo attacks, and so on.

Although the timing of these attacks varies, in general, it is not a secret thing, so Junxin did not hesitate too much, and said these methods one by one, without too many reservations.

"These methods can indeed attack the shortcomings of the RSA algorithm, and then produce information leakage." "But in general, the targeted attack methods are basically due to the inherent shortcomings of the RSA algorithm, and it is really difficult to achieve perfection." ”

Hearing this, Junxin nodded in agreement. Even if he didn't come from a computer science background, he knew a lot about RSA algorithms. After all, this is a big branch of mathematics. Therefore, the existence of RSA algorithms has not been solved in the 21st century, and he does not know how to solve it.

Of course, in fact, both the three of Levest and Junxin are very clear that with the current electronic computer with average speed, these shortcomings of the RSA algorithm are nothing at all. After all, if you want to take advantage of these shortcomings, you can't do it at the current speed of these electronic computers. However, they are not self-deceiving people, and no one understands the development direction and trend of computers better than them, so the problem that Junxin said is a problem that they may encounter and will solve in their future work, so what Junxin said may not be used at all now, but they are still very concerned.

In fact, seriously speaking, they may not be able to think of the shortcomings of the RSA algorithm, but because of the development of electronic computers, they have not encountered related problems, so what Junxin said is more of a reminder for them, and the hero sees the same idea.

So after talking about the RSA algorithm, the three of them and Junxin began to talk freely. For the algorithm problems of electronic computers, the three of them can be called authoritative experts or master-level figures, so in the conversation, Junxin asked more questions. Because of the foreshadowing of the RSA algorithm problem above, the three of them are still very optimistic about Junxin's ability, and they are grateful in their hearts, so many problems are explained in great detail, which benefits Junxin a lot.

The exchange between the three lasted for a long time, and it did not end until more than eleven o'clock in the evening. This made Junxin have to sigh that there is a heredity for those IT men in later generations to stay up late every night to write code. But fortunately, although it was late enough, Mit did a good job of that even if it was so late, there was a special driver to send Junxin to his hotel, saving him the trouble of taking a taxi back.

There was nothing to say all night, or because all the things in the past few days of coming to Mit and Harvard University have been satisfactorily resolved, or because he was exhausted from discussing difficult academic problems, so Junxin slept very sweetly after returning to the hotel, and when he woke up the next day, it was already about half past ten in the morning.

Because he agreed to Professor Yau's invitation to luncheon, Junxin hurriedly took care of everything, then retired from the hotel, and randomly stopped a taxi on the side of the road and headed in the direction of the address provided by Professor Yau.

"Jun, welcome!" By the time the car came all the way to the door of Professor Yau's house, it was almost half past eleven.

"I'm really sorry, I spent a bit of a long time in Mit yesterday, and I was a little too tired, so I was late and kept you waiting." Jun Xin said apologetically.

"Haha, Professor Quillen told me on the phone about you yesterday, it's okay, after all, you're still a teenager, and it's better to get enough sleep. Alright, let's not stand stupidly at the door, let's come in! Professor Qiu didn't care about Jun Xin's late arrival, and still said enthusiastically.

Harvard University's treatment of Professor Yau Chengtong, a would-be Fields Medal winner, is very good, an independent three-story small western-style building, plus a garden in the front and back, which is very quiet and very comfortable, although it is not a paradise on earth, but it is also a warm and tranquil family.

Since it is in the form of a family feast, Junxin also brings some seasonal fruits according to Chinese etiquette. When he arrived at the house, he found that Professor Yau had invited not only himself, but also several of his students, and he had also met a person who surprised him very much, Horowitz of the Institute for Advanced Study in Princeton.

"Horowitz, why are you here?" Junxin asked in surprise.

"Don't you know? Tomorrow is Christmas, and it stands to reason that it is time for a holiday, so I took this free time to come over and report to my supervisor about my recent work and research results, and discuss the direction of follow-up research. Horowitz said with a smile.

As soon as Horowitz said this, Junxin suddenly realized. Although Horowitz is doing postdoctoral research at the Institute for Advanced Study in Princeton, his supervisor is Professor Yau Chengtong, and now that the year is closed, it is natural for him to report on the progress of his work.

"It's been a long time, how are Professor Witten and the other professors okay?" Junxin asked.

"They're all healthy!" Horowitz replied, "I recently had a discussion with Professor Witten about the extra dimension problem in superstring theory, and Professor Witten thought that we should show the results to Professor Yau, after all, the extra dimension is mainly applied to the Calabi conjecture proved by Professor Yau, so his opinion is more important, which is one of the reasons why I came to Massachusetts." ”

"Finished with your paper?" Junxin's eyes lit up.

"Well, you can take a look at it later, after all, you're an expert in this area."

"No problem!" Junxin agreed.

"What are you talking about?" At this time, Professor Yau Chengtong also walked into the room and asked.

"Professor, we are discussing the extra dimension of superstring theory, the paper has been completed, if you have time in the afternoon, can you help us take a look?"

"It's incumbent!" Professor Yau Chengtong is very happy about this matter. "Alright, now that everyone is here, let's get started!"

"Yes, Professor!"