Shu Yi came out of Ma Juan's room, and Long Jiuyuan asked hurriedly: "How is it? Did she say something?" Shu Yi nodded: "She did, but it has nothing to do with the calendar." Long Jiuyuan

Yuan was stunned for a moment: "Is she still unwilling to talk about the calendar?" Shu Yi sighed: "It's not that she refuses to talk but she really doesn't know about the calendar at all!"

Shu Yi took the cigarette that Long Jiuyuan handed him and put it on and said: "She said that the reason why she went to Xu's house was to get something back. That thing was what she gave to Xu Jindong, but she couldn't find it no matter how hard she looked for it.

Found it." Long Jiuyuan frowned: "What?

What?" Shu Yi replied: "A letter, a letter sent from Xikang to Lin Dewang." Long Jiuyuan had carefully investigated Lin Dewang's social background, and he said: "I have never heard of it.

Does Lin Dewang have any relatives or friends in Xikang?"

Shu Yi said: "Ma Juan said that this letter was definitely sent to Lin Dewang, but it was sent to Ma Yong's original store. You also know that store has been sold by Ma Yong a long time ago." Long Jiu

Yuan asked: "She should still remember the content of the letter, right? And when was this letter sent?"

Shu Yi laughed when he saw Long Jiuyuan being so anxious: "The letter was sent after the fire at Long Jiuwang's house, but the content of the letter was a bit strange. According to Ma Juan, there was not a single Chinese character on it, it was all numbers.

Ma Juan suspected that it was a set of passwords. I asked her why it was like this.

So she thought that she had seen a telegram before. The letter was like a telegram. It was a group of four digits. The letter was also given to her by the shop owner when she accidentally went to a small store to buy something. This matter

He didn't tell Xiao Ying, but secretly handed the letter to Xu Jindong!"

Long Jiuyuan was a little confused: "Why should it be handed over to Xu Jindong?" Shu Yi said: "Because Xu Jindong's cousin works in the telecommunications bureau and happened to be in the telegraph room." Long Jiuyuan said: "Since Ma Juan didn't find the letter,

Maybe it has fallen into the hands of cousin Xu Jindong?" Shu Yi nodded: "It is possible." Long Jiuyuan said: "Isn't it just a letter? Why didn't Ma Juan tell us about this? She

What else is being hidden?”

Shu Yi didn't speak, and Long Jiuyuan said: "Where does Xu Jindong's cousin live? Let's go there now!" Shu Yi said: "She lives on Guanshui Road." The two got in the car, and Long Jiuyuan drove and took photos.

Looking for the place Shu Yi mentioned, Shu Yi didn't say much along the way. Long Jiuyuan asked: "What are you thinking about?" Shu Yi shook his head: "There are some questions that I don't understand." Long Jiuyuan didn't understand.

He asked with understanding: "Don't understand? What don't you understand?"

Shu Yi said: "First of all, that letter. If it was really a secret letter, why was it sent to the small store that Ma Yong had already sold out? The recipient of the letter should obviously be Lin Dewang, but it happened to fall into Ma Juan's hands again.

It would make sense if this letter was sent before Lin Dewang disappeared, because the store had not yet sold out the goods at that time.

He probably wanted to give it to Xiao Ying, but this letter was sent after Lin Dewang came back. After Lin Dewang came back, he should have his own mailing address, right? Even if he asked to send it to the store, it was

Shouldn't you also say hello to the owner of the shop and let him know that a letter is coming, so that it won't be taken away."

Long Jiuyuan was stunned when he heard this, but he knew that what Shu Yi said made sense.

Shu Yi added: "Secondly, Ma Juan got the letter and gave it to Xu Jindong. The purpose of giving it to Xu Jindong was to ask Xu Jindong's cousin to help her decipher the letter. She trusted Xu Jindong so much, so

She should have thought that Xu Jindong might have given the letter to his cousin, so why would her first reaction after something happened to the Xu family be to return to the Xu family to look for the letter?"

Shu Yi didn't wait for Long Jiuyuan to ask another question, he added: "The most important point is that Ma Juan already knew that we were investigating this matter, and she later showed that she was very cooperative with our investigation. Since there is such a

It was a letter, and she didn’t know the content of the letter at all, so why did she deliberately conceal the existence of this letter from us? She didn’t tell her about it until I communicated with her today!”

Long Jiuyuan smiled: "In the final analysis, you still think there is something wrong with Ma Juan." Shu Yi smiled bitterly: "I have always thought there is something wrong with her, she is like toothpaste, she can always squeeze something out, but every time she provides

The clues given to us seemed to be deliberately misleading us. Thinking about it again, if it hadn't been for her trip to Xu's house, I wouldn't have been able to discover the secrets on the calendar, right?"

Long Jiuyuan shook his head. He couldn't answer any of Shu Yi's questions: "Actually, since you have so many questions, why didn't you just expose her for lying? Why did you go crazy and go find Xu Jindong's cousin!"

Shu Yi said lightly: "It is not easy for her to say this. Besides, since she mentioned that there is such a letter, I believe that letter must exist. Of course, is this letter really what she said?

It is said that it was sent to Lin Dewang, so I can't tell if it is really important. But I think no matter what the letter is, it will be helpful to our investigation."

Long Jiuyuan speeded up the car, he was also looking forward to the letter.

Xu Jindong's cousin is called Cen Hong. She is a very ordinary woman with an average height and appearance. She is the kind of person who is difficult to find if she is thrown into a crowd. She did not expect that someone would be looking for her so late at night.

The husband looked at Shu Yi and Long Jiuyuan with strange eyes. When Long Jiuyuan revealed his identity, his surprise turned into fear.

Cen Hong’s husband is named Wu Weihong, which is a slightly feminine name. Of course, this name also has a certain historical imprint. When he heard that Shu Yi and Long Jiuyuan were from the National Security Bureau of Lincheng City, Wu Weihong hurriedly let them go

When he got to the sofa, he offered a cigarette and asked Cen Hong to pour tea. He didn't even care that he was only wearing a vest and a pair of shorts. When Cen Hong glared at him dissatisfied, he smiled awkwardly.

He walked into the bedroom laughing.

Cen Hong was wearing short pajamas. Although she was not serious enough, she was not degrading. She asked softly: "What's the matter with you two? Are you looking for me or Wei Hong?" Shu Yi said: "You know Xu Jindong, right?

?" Cen Hong nodded slightly, and at this time Wu Weihong came out of the bedroom

After walking out, he put on his clothes and sat down next to Cen Hong. When he heard Shu Yi and the others mentioning Xu Jindong, Wu Weihong said angrily: "The death of Jindong's family was too tragic. Police comrades,

You must catch the murderer as soon as possible and redress the injustice for Jindong’s family!”

Shu Yi smiled faintly: "We are not police, we are staff of the National Security Bureau, but you can still call us police officers! We came today to ask Ms. Cen Hong whether Xu Jindong gave you something before he died.

A letter?" Shu Yi did not explain what kind of letter it was.

Cen Hong's expression was very natural: "There is a letter, but it's not a letter. Jindong told me that Ma Juan asked him to get it. He and Ma Juan have divorced a long time ago. This woman is a trouble. She is obviously divorced."

, but refused to let

Jindong remarries, and she still cares about this and that, and the letter she gave Jindong was not a telegram, but it was said to be a telegram. I only glanced at it, and it was not Morse code at all." Shu Yi said:

"Oh? What is that?"

Cen Hong stood up and walked into the room. After a while, she came over with a piece of paper: "Here, this is it." She handed the paper to Shu Yi, and Shu Yi only glanced at it and confirmed that it was not the paper.

At this time, Wu Weihong said: "Although this thing is not Morse code, it must be arranged in a certain code, and it must have its meaning."

Shu Yi looked at Wu Weihong: "Oh, Mr. Wu is also familiar with passwords?" Wu Weihong's face turned red: "It's okay, I have been fascinated by this stuff before, but I also taught myself." Shu Yi raised the piece of paper in his hand.

"Have you ever tried to crack this?" Wu Weihong glanced at his wife, and Cen Hong said lightly: "I didn't let him touch it. With his virtue, as long as he gets exposed to these things, he will stay up for days and nights without sleeping.

question."

Wu Weihong smiled awkwardly. Shu Yi ignored Cen Hong and handed the page directly to Wu Weihong. Wu Weihong took it and looked at it: "Actually, I have also read it secretly after Cen Hong went to work in the past two days.

I have tried several cracking methods." He secretly glanced at Cen Hong, who smiled bitterly: "Since the two police officers asked you to say it, just say it!"

Wu Weihong then continued: "In fact, anyone with a discerning eye can tell at a glance that this thing is not Morse code. Later, I wondered if it had been mutated, but I tried seven or eight commonly used Morse code mutation methods, but

None of them worked, so I wondered if it was mixed with Hill cipher. Unexpectedly, I found some characteristics of Hill cipher, but it didn’t have any characteristics of Morse code at all.”

Long Jiuyuan also knew a little bit about the Morse code. After all, it was the most commonly used one, but he was a little confused about the Hill code. Shu Yi listened to it with great interest. He was originally a top military intelligence officer, and he had no idea about the code for a while.

Like Wu Weihong who loves it so enthusiastically. But since Wu Weihong has already studied it, he is happy to share Wu Weihong's results.

As soon as Wu Weihong mentioned the password, he seemed to be a different person, and he was spitting like crazy. Cen Hong wanted to remind him, but Shu Yi stopped her. Wu Weihong took a pen and wrote quickly on the paper.

He said: "But I have tried using the Hill cipher alone. Although there is some content, it is messy and has no real meaning at all. In the end, guess what method I used to decipher it correctly?"

Shu Yi looked at the piece of paper in his hand, and for a moment he couldn't answer. Wu Weihong actually didn't expect his answer. He said excitedly: "Caesar encryption method! A very ancient encryption method, somewhat similar to

The current Vigenard square! I broke up these numbers with Hill cipher first, and then applied them to Caesar cipher. I got the correct answer. How about it? It’s wonderful, isn’t it? I spent a total of three days on this.

My mind didn’t stop for three days!”

Cen Hong glared at him: "No wonder you have been absent-minded in everything you do during this period!" Shu Yi did not ask him what kind of promise he got, but picked up his pen and started calculating. Long Jiuyuan was not so elegant.
Chapter completed!