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As soon as Duan Tianwolf finished, a five-hundred-and-twelve-digit password popped up on the page, and underneath this password was a countdown. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

It started at twenty minutes, then immediately went from nineteen minutes and fifty-nine seconds, and then little by little it began to disappear.

According to the rules of the game, from this time on, there will be a total of five chances to change this password, and these five chances are 20 minutes, 10 minutes, 60 minutes, 80 minutes, and 100 minutes.

So, on the face of it, all the participating teams have a total of five chances, because you can pass by guessing any of them.

But actually, it's, I'll give you a 512-digit password, and then you give me a guess what the next password will be? You're a god, you can't guess it.

Normally, if you want to calculate a cryptographic pattern, you need at least three sets of data to be successful.

In this way, the two password changes of the twentieth minute and the tenth minute can only be used to collect data and must be discarded.

However, because the title has given two keyword hints, one is related to the Fourier transform algorithm, and the other is related to computer basics.

The computer basics are almost like Zen, and all of a sudden no one knows what's going on.

As for the fast Fourier algorithm, it is something that is too familiar to any of the utopians.

Here, we need to briefly introduce the fast Fourier transform algorithm.

It is no exaggeration to say that among all the algorithms in the world, the fast Fourier transform algorithm is almost the one that has the greatest impact on our daily life. When we pick up the microphone and make a call, send a text message on our phone, listen to a song with P3, or watch a Hollywood blockbuster with DD, there is a fast Fourier transform algorithm at work in all of these things.

It can be said that in this world, as long as there is a digital signal to be processed, then there is a Fourier transform algorithm. The discrete Fourier algorithm is the cornerstone of modern digital signal processing, and the fast Fourier algorithm is one of its fast algorithms.

Because the fast Fourier algorithm is extremely easy to implement with hardware, it is extremely widely used in the field of electronic technology. Any slightly more advanced programmer knows something about it.

As one of the best hackers in the world, the Utopians naturally have a deep understanding of the fast Fourier algorithm.

There are many kinds of fast Fourier algorithms, and together they know almost all the fast Fourier algorithms in the world.

It's good for them. Because, in this way, when they calculate the password rules, they can set the parameters in more detail, so as to greatly save the calculation time.

Twenty minutes later, the password changed and a new one appeared.

Three minutes later, Sun Yunmeng listed five possible fast Fourier algorithms for the other three people in the "security company", Ling Xuesheng listed two, Duan Dixian also listed species, and finally, Duan Tianluo listed seven algorithms.

"If nothing else, it should be one of these ten." Ling Xue said sadly.

"I hope all the best." Sun Yunmeng wrote, "But why do I always think that things can't be so simple? ”

After another twenty minutes, and when the time came to ten minutes before the start of the test, a new password appeared.

Immediately after the appearance of this new password, twelve algorithms were excluded, so that only two remained.

At this time, the Utopian group didn't talk nonsense anymore, they were in place, Duan Tianwolf distributed the data, and then the individuals immediately used their own devices to calculate it.

Duan Tianluo used Siemens' main server cluster, while Sun Yunmeng used his favorite TV station satellite, as for what Duan Di Tapir and Ling Xuexian used to calculate, it was unknown. In short, both men received the amount of data they thought could be calculated.

After using batch supercomputers at the same time, about eight minutes later, the data was summarized by the individual, and then processed by Duan Tianwolf in a centralized manner.

At thirteen minutes, Duan Tianluo got the final result.

And this final result surprised everyone in the Utopian group - the possible surnames of the two algorithms are also 95 percent.

"How so? So what kind of algorithm is it? Ling Xue asked in confusion.

Duan Tianluo replied, "I think, it's probably neither. ”

"I hope it doesn't really happen, but if it does, then it's a big deal."

As soon as Sun Yunmeng finished saying this, he added: "Although I really want to be one of them, I think I'm afraid 01's idea is right." ”

"There's special parameters in it." Duan Tianwolf said immediately.

As soon as Duan Tianwolf finished speaking, Duan Di Tapir immediately followed: "That's right, I agree with the algorithm used by Hongjun, it is definitely not the traditional Fourier transform algorithm. He must have added new parameters to this parameter to form a new special Fourier algorithm. ”

Sun Yunmeng followed: "This should be the case, there are a total of two hundred and sixteen groups of participating groups, and it is impossible for Hongjun to write a different algorithm for each group." And if all of them use the same algorithm, it is possible for each group to cheat. So, he must have used the same algorithm, but in addition to this algorithm, he also added a special parameter. ”

Duan Tianwolf said again: "If my guess is correct, Hongjun should have designed a special code for each of our groups. Then fuse this entry code with this Fourier algorithm to create the cryptographic pattern that appears. In this way, one can avoid the situation mentioned by Xiao Meng, and the other can more clearly know which group is successfully qualified. ”

"Can I interrupt?" At this time, Ling Xue said, "If it is a special Fourier algorithm, then it has an almost infinite number of possible surnames. Where do we start? We only have 60, 80, 100 wonderful chances now. ”

"Say nothing now, we have to wait until the third transformation of the password." Duan Tianwolf said.

This time, no one replied, because Duan Tianwolf was right, they couldn't do anything now but wait.

A few minutes later, sixty minutes arrived, and the password changed for the third time, waiting for a new password.

The Utopians act again, putting all the previous passwords together and matching them with all the fast Fourier algorithms to calculate them.

While the computer was calculating, Duan Tianwolf began to feel that something was wrong, and he said to the others in the call box: "No, I think there must be something wrong." ”

Duan Di tapir said: "That's right, we have another tip that is useless, computer basics. Hongjun will not inexplicably put such a keyword here, it must have a very key role. ”

"Computer basics, how do you understand this? Oops, I really can't stand it, this old gentleman's name is mysterious, how can a keyword be so mysterious? ”

Time was ticking by, and at this time, Duan Tian Wolf and the others wished that time would stop, so that they could be given a little more space to think. However, time is running fast at this time.

After a while, the time came to seventy-six seconds, and the results of the computer's calculations came out, just as Duan Tianwolf had expected and feared, this time, all the algorithms were excluded.

Soon, the time came to eighty seconds, and the password changed for the first time.

There is one last chance.

Duan Tianwolf and they had to accurately predict what the password of the hundredth minute would be within twenty minutes, otherwise, they would be eliminated in the first level.

Duan Tian Wolf lightly pressed his brow with his fingers, his eyes slowly closed, his thoughts had already left the test, and he had also left this password law. Instead, it returned to Hongjun. He was thinking about all the legends of Hongjun, and he recited in his mind the only publicly published document in Hongjun's history—the open letter.

And he thought that all of this was thinking about a question - what does computer foundation mean in Hongjun's mind?

At this moment, Duan Tianluo was like a Zen monk, completely immersed in a state that ordinary people could not understand, and his entire consciousness was roaming in the sea of nothingness, trying to capture some kind of inspiration that was unpredictable, but must exist.

This inspiration cannot be described in words, nor can it be reasoned with normal logic. This inspiration is like a monk who has been practicing penance for 50 years without attaining anything, but suddenly he has an epiphany when he sees a leaf.

Ten minutes later, Duan Tianwolf opened his eyes, and in the call box, he wrote two Arabic numerals, as well as a word, "01, and non-arithmetic." ”

Sun Yunmeng, who was originally thinking hard, and Sun Yunmeng and Duan Di, who didn't know about it, immediately reacted, and the two of them spoke almost at the same time: "Ah, I understand what you mean." ”

At this time, Ling Xuesheng hadn't fully understood, and she spoke a little strangely: "What do you understand? ”

"The so-called foundation of computers is 0 and 1, isn't it? And in all the worlds composed of 0 and 1, will there always be only two possible surnames, that is, and not? Sun Yunmeng explained excitedly.

At this time, Ling Xuesheng finally understood, "I know, it's the two algorithms we just discovered. Transform both of these algorithms into binary code, and then do non-operations so that you can come up with a new algorithm, right? ”

"Yes, that's it." Sun Yunmeng replied.

As soon as he finished speaking, he saw a sudden prompt from the server, "A team has qualified." ”

"Who is it? Faster than us? Seeing the server prompt, Sun Yunmeng asked strangely.

Duan Tianwolf only thought for a moment, and then wrote, "It is very likely that the Mask Island is also here. ”

(To be continued)