Chapter 183: 183

The quiet room was interrupted by a clanking sound.

I looked and saw Niblo and Diamond flipped over on the coffee table in front of the sofa. There was coffee spilled on the floor.

"What are you doing, you two?"

"I think Yakumo made them drink coffee and then they went like that."

Natsuki told me.

For now, I went to the sofa and rescued the two creatures. They didn't seem to be dead, but they seemed to be unable to find their footing. They were both like newborn babies. I wonder if coffee is as dangerous for spiders as it is for cats to eat leeks.

--drink, promotion, celebration, too much --

So they say.

At that moment, I suddenly saw the screen of Yakumo's laptop.

It was a message board. The only post on the board said, "The snow will stop, but it will soon come back harder."

"So the snow will stop........."

I can look out my window and see that it's midnight now, but it's still pouring down. But if Yakumo says otherwise, it must be so. Yakumo's prediction is dead on.

Then Abigail walked up to me and looked at the screen. Her expression seemed to have lost some of its tension.

"He's our Nostradamus."

When I introduced Yakumo, Abigail seemed to notice his post and muttered, "Ah, so this is him......."

"Oh, by the way, did Gevaudan write that post?"

"I had Yakumo write it on my behalf. He is the original prophet-kun, so there was an air to it, wasn't there? And he's pretty much right. You see, in the message to Abigail, there was a sentence saying that the wise men of the forest would be waiting for us. When I arrived at the church, there was a rare owl. You hit the mark again, Yakumo."

I rubbed Yakumo's hair.

"Hee~"

Abigail looked at him admiringly.

Right after, Natsuki sat down next to Yakumo.

"After seeing onee-san's post, I didn't know what it meant, but soon after, Yakumo searched for a place called Valhalla. It was also Yakumo who unlocked the credit card."

"Yes. This boy is very capable. We can't have a conversation, but it was Yakumo who found Abigail's posts and told me about it."

"Hee~?"

As I said this. There was a very brief moment that I think I saw "?" on Abigail's head, floating in the air.

"This is something I don't understand, but apparently Yakumo can decipher trip. So Abigail's key came up as 'Gevaudan', the same as my name. He noticed it right away."

"......?"

This time, Abigail had a noticeable "?" on her head.

"You typed in the key and searched for the trip that came up, right?"

"?"

It was my turn to tilt my head.

"Hmmm? No, Yakumo found Abigail's post, and then when I typed in the key you gave me, I found that it was the same one."

"Isn't it the other way around?"

"The other way?"

Abigail and I both had a "?" on our heads. floating in the air.

No This isn't gonna work. This was a conversation between an analog and a digital person.

Maybe Natsuki can explain it.

"Natsuki, we checked the trip after Yakumo found it, right?"

"Yeah. After Yakumo found it, I made sure that the key gave the same trip character. Until then, Yakumo didn't even know about the note that Jebotan had."

"...... you are saying that Yakumo-kun can decipher the key from the trip?"

"As I said," Natsuki continues, her hands on her hips.

"Just like Jebotan said earlier. Yakumo can read trip."

"........ yes???"

over Abigail's head are "?" floating in large numbers. It's a wonderfully stupid face. I rarely see this kind of expression on her face. I'll have to burn it into my memory. Polaroid ...... Polaroid .......

"How can you possibly read it? The trip is a One-way function."

"What's that?"

I asked, and Abigail's voice got a little raspy and fast.

"It means that a trip can be easily generated by the key, but the opposite cannot be done. It's infeasible. It's practically impossible to know the original trip key from the trip. That's why this is an anti-spoofing measure. If you can get it, you can impersonate whoever you want on the board."

Natsuki quickly responds, "Yakumo can read it."

"That' s impossible."

"...... I'm not lying!"

With a sullen scowl, She glared at Abigail.

"So .... what about this?"

Abigail pointed to the trip on the screen.

"Yakumo, try this trip out."

At Natsuki's prompting, Yakumo typed in a few words.

The same trip was added to the post.

"See?"

Natsuki snorted smugly.

"Ehhh ...... what the meaning of this ????"

But this only deepened Abigail's confusion.

They went through the same thing over and over again after that, but the result was the same.

It was demonstrated that the Yakumo could reverse calculate the original key from the trip.

In other words, we can impersonate anyone we want. Heaven has given a golden rod to the keyboard Warrior, and he could even cripple F-Channel with this. The tales of Yakumo's legendary keyboard Warrior are just around the corner.

Abigail turns silent.

I look over and see that she is completely frozen. Her eyelids are wide open and she seems to have stopped breathing. I'm starting to worry that she's having a seizure.

"What's wrong? Are you okay?"

When I asked her to confirm that she was alive, she looked as if she had seen a cockroach slip under the covers, a combination of surprise and horror on her face, and grumbled, "What the hell ....... something like this is....."

"The one-way function is the foundation for all modern cryptography, Almost all computers are designed to be secure by taking advantage of the fact that one-way functions cannot be solved in reverse."

"Hmm?"

"Just now, this boy could even reverse engineer the tokens of the one-time password. In an instant."

"Is it amazing?"

"It's amazing ...... this is usually only a brute force analysis can solve ...... If Yakumo-kun can solve not only the trips on this board but also any one-way function in reverse.........."

Abigail cut off her words there.

"It's not just spoofing in the message boards. It's possible to break any encryption."

Abigail looks back at me.

"This kid is a prodigy. There's no other logical explanation."

So it was like, His mind is not in the right place.

So, I shared the knowledge I had acquired over the past week.

"I think Yakumo has savant syndrome. I wanted to talk to Yakumo, so I did some research. Here, take a look."

I showed Abigail Yakumo's notebook.

"Isn't he amazingly good? They say savant syndrome is a peculiar trait found in some people with autism, that they have a little difficulty in everyday life like Yakumo, but they also have some outstanding talent."

Abigail shook her head helplessly at my attempt at unveiling my own theory.

"This is on the level of godlike power. It's not a savant, or a gift, or any of that mundane stuff."

mundane .......

"But, isn't there a bit of a connection?"

"It's just not on the same level as savant syndrome. He's like a living Nondeterministic Turing machine. Don't tell me he's really a prophet?"

You are using an analogy that I don't quite understand. She doesn't seem to have the time to pay attention to me. I'm a little hurt that I went to the trouble of researching this. I'm disappointed.

"...... Jebotan, is she praising Yakumo?"

"...... maybe ......"

While Natsuki and I were having our secret conversation, Abigail walked around to the front of Yakumo, who was sitting on the couch, kneeling down and making eye contact with him.

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