"I don't know!" Brother Nan's answer surprised both Su Chen and Peng Xinning.

After all, this thing was sent to her, and if she can't understand it, who can understand it.

"This thing was left by a suspect in a case, just such a string of things, that string of meaningless numbers I translated, but it doesn't seem to have anything to do with the case." Brother Nan said.

She couldn't say any more details, after all, it involved the principle of confidentiality.

"It's not about friends, that's boring, don't watch it! I'm still thinking about deciphering it! Su Chen returned the phone to Brother Nan, there was no news, Su Chen felt boring.

"Can you solve it?" Brother Nan asked.

"Nonsense, don't forget what kind of major I am, but I don't guarantee that the answer will help you, no, you are a traffic policeman, don't maintain urban traffic order, what case are you investigating?" Su Chen suddenly reacted.

"Who said that the traffic police can't handle the case, if I can solve it, maybe I can return to my original post." Brother Nan asked Xiao Chen to come to these headless cases, and the clue was that he wanted to make meritorious service and return to his original post.

"Then I can't help you out, if I help you go back to such a dangerous post, my aunt will scold me to death." After knowing that Brother Nan had this idea, Su Chen was even more reluctant to help.

Su Chen knew that Brother Nan's parents didn't want Brother Nan to be a criminal policeman, after all, it was too dangerous.

"You have no conscience, you made me a traffic policeman, you don't help me, won't your conscience hurt?" Brother Nan airway.

Su Chen touched his heart, and then scratched it, "It's a little itchy." ”

Brother Nan was angry, "If you don't help me, I'll tell my dad that you just treated me like that in the car!" ”

"Wow, brother, brother...... What do you do to Sister Nan Nan? Peng Xinning seemed to have heard some big news, stopped eating anything, and began to gossip.

"Don't talk nonsense, what am I doing, I didn't do anything!" Su Chen hurriedly argued.

"Really?" Brother Nan began to threaten.

Faced with Brother Nan's threat and Xin Ning's curious gaze, Su Chen compromised, "Then I'll help you take a look, but I don't guarantee that I can decipher the original ciphertext, after all, these cryptographic enthusiasts may come up with their own special codebooks." ”

Before Su Chen finished speaking, Brother Nan had already moved a stool and sat next to Su Chen, and even Peng Xinning sat over.

"Go get me some paper and a pen." Su Chen commanded.

Brother Nan called the waiter and asked for a ballpoint pen and a few pieces of paper.

Su Chen glanced at the two women, "I'm thirsty!" ”

Brother Nan hurriedly refilled the teacup, "Come, uncle, drink water!" ”

"I want to eat watermelon!" Su Chen continued.

Peng Xinning hurriedly picked out a piece of watermelon from the fruit salad on the table with a toothpick, "Come, the eldest young master eats melon!" ”

The reason why Peng Xinning is so attentive is purely out of curiosity, after all, she rarely has access to this kind of investigation thing.

Su Chen: "I ......"

"Don't say anything more, I'll fork you!" Brother Nan suddenly picked up a fork for eating and inserted it directly in front of Su Chen.

"Ahem, I'll start right away!" Su Chen didn't dare to continue to chatter.

"As far as I know, most cryptographic enthusiasts like to use multiple passwords, just like when passing a note in the past, after translating this Morse cipher according to the standard cipher table, it may be a set of numbers and letters, such as YW32D7Z9, which may be the meaning of the ninth word in the seventh paragraph of the thirty-second page of the Chinese text." Su Chen remembered the incident of playing with his friends to pass notes before.

"Let's get to the point, who doesn't know that you used to pass paper in class and go to the Internet café after school!" Brother Nan interrupted.

"Uh, you see, the first layer of passwords, Xinning has been solved with the general password table, it's 7432424172635343.

At first glance, it is a very nonsensical set of numbers, but if we think about it, it may be a codebook used in our lives.

I'm sensitive to numbers, maybe you didn't notice it, but I did.

Let's split this set of data in two and then look at it. ”

After Su Chen finished speaking, he wrote directly on the paper with a pen.

“74、32、42、41、72、63、53、43”

Isn't it obvious at first glance? Do you see any patterns? Su Chen asked.

Brother Nan shook his head, isn't this still a bunch of numbers? Where is obvious.

Peng Xinning said that she didn't see any patterns.

"Alas, it's stupid, I just said that we commonly use the password table, so can the keyboard of our mobile phone input method also be regarded as a password table? But there are several kinds of keyboards for mobile phone input methods,Which one is it? Next, we continue to analyze, from this set of data, we can see that the largest single digit is '4', then we can easily think of the nine-square grid.

The mobile phone nine-square grid, each number button contains a maximum of 4 letters, such as 9, which contains 'W/X/Y/Z' four letters, which is the most situation, in line with the law of this group of numbers. ”

Su Chen spoke very slowly, and Brother Nan and Peng Xinning also understood.

Then let's follow this idea, press the number 7 in the nine-square grid, the fourth letter in the 7 key is S, and so on:

74=S 、32=E、 42=H、41=G、72=Q、63=Q、53=L、43=I

The final translation is SEHGQOLI. ”

Su Chen wrote out this string of meaningless letters on the paper.

"What is this? Pinyin is not pinyin, and English is not English. Brother Nan was still puzzled.

"It's said that it's a multi-password, isn't it that it hasn't been solved yet?" Su Chen said unhurriedly.

"This person likes to use the keyboard as a password table so much, and likes multiple passwords, so does he also use a 26-key keyboard after using a nine-square grid? It's the kind we use on our computers, let's continue to push it back, and if it's wrong anyway, there won't be a piece of meat.

Su Chen took out his mobile phone and opened the keyboard with 26 keys.

"It's all letters, how do you convert letters into letters?" Su Chen asked.

The two women still shook their heads, Su Chen expected it, and continued.

"We know that the letters on the 26 keys are not in order, so let's sort them underneath it, like this:

Q=A, W=B, E=C on keyboard...... Finally, we correspond to the meaningless English SEHGQOLI we got earlier, and find the corresponding password on the keyboard according to it.

In the end, it came to the conclusion of 'ltpoaish'" Su Chen was very satisfied, at least there was no mistake in solving the problem so far.

But Peng Xinning and Brother Nan don't think so.

"What the hell is this, it's not a string of meaningless letters."

"That's it! Bullshit. ”

"Be civilized, don't move bullshit!" Su Chen shouted.

"Now we look at it as a disordered set of English letters, but I feel like it's just an English word, but in the wrong order." Su Chen said.

"Brother, you won't do permutations and combinations, this will be the Year of the Monkey!" Peng Xinning interrupted.

"Do you brother and I look like that stupid person? Remember how we started solving the problem? After grouping a set of unordered numbers, and finally after a few steps, we get a set of letters that are still out of order, so is it possible to repeat the old trick? This author used to use two two-number groupings, so can the letters be divided into two groups?

We can use the fence cipher method to solve the following. ”

Su Chen said and split "ltpoaish" in two.

“ltpo”

“aish”

Peng Xinning: "......"

Brother Nan: "......"

In the end, it was Brother Nan who spoke up first, "Didn't you turn one set of disordered English letters into two sets of disordered English letters?" Where to solve it. ”

"If you don't understand, don't interject, I just said the fence password method, and the fence hasn't been formed yet, what are you anxious about." Su Chen was unhappy that he was interrupted, and he wanted to pretend to be forced, but the two women didn't understand it at all, so they couldn't pretend at all.

Su Chen didn't sell it anymore, "Fence Cryptography Method, then insert the letters of the second group into the letters of the first group at intervals, isn't this like a fence?"

A is inserted between LT, I is inserted between TP, S is inserted between PO, H is inserted into the last position, and finally 'LATIPSOH'" can be obtained."

"Is that the answer coming out?" Su Chen said with a smile.

Although the final English is reversed, Brother Nan still recognizes "hospital" at a glance.

"Hospital?" Peng Xinning also felt that it was amazing that the two sets of letters, which were still disordered in her eyes just now, had now become a reversed English word.

"Well, I'll be able to figure it out to this extent, and I'm not sure if it's right or not, after all, I'm not the password creator himself." Su Chen said.

"Don't talk about it, I still have something to do, let's not talk about it yet!" Brother Nan hurriedly said goodbye, because Brother Nan felt that Su Chen had guessed correctly, in the investigation of the suspect, the suspect had a friend who worked in the hospital morgue, and no one would think about this layer at that time, but now it seems that he has a clue.

"Brother Nan......" Su Chen was very helpless, he didn't expect Brother Nan to turn his face and deny people so quickly, and he finally solved it for her, but she didn't tell herself anything, whether the answer was right or not, at least say thank you to herself, she just ran away.

"Brother, you carry me back, I'm too full to walk!" At this time, Peng Xinning stroked her stomach and said.

"If you don't carry it, you can't go if you love it!" Su Chen said that he was going to pay.

"Brother, if you don't carry me, I'll tell my aunt that you did that to Sister Nan Nan......" Peng Xinning shouted behind Su Chen.

Su Chen: "......"