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Kang Tu pointed upwards, and still lowered his voice, "Then it should be the outline of something?"

Zhao Zheng also looked up, frowned and said, "Where?"

He had already looked at it when he first came in here, but he didn't find anything. Now he squinted his eyes and observed carefully again, but there was still nothing.

Kang Tu said: "Don't stare at one place, look at it as a whole, it seems that there is a vague shadow."

There seemed to be some faint changes of light and shadow above the darkness, Kang Tu murmured, "Is it 'M'?"

Zhao Zhengchong waved to Li Xin: "Come and see, is there anything on it?"

Li Xinxin stared at him, then lowered his head after a long time, nodded and said, "Yes."

Zhao Zheng frowned: "You saw it too?"

Kang Tu stretched out his hand, and gestured to him in the void along the strokes: "Here, you can see that some places are particularly dark, look along this edge."

Zhao Zheng finally saw it slowly. When he saw it clearly at first glance, he felt that this figure was actually very obvious.Looking at the darkness above, you can only see this figure.

"You may have very good eyesight." Kang Tu lay on the stone steps, feeling a lot more at ease, "I have always seen things blurry, and I can only see such a large area."

"But what does that mean?" he asked leisurely.

Zhao Zheng spread his hands at him: "I don't know."

Kang Tu was stunned for a moment, and repeated: "I don't know?"

Zhao Zheng nodded helplessly, and said, "I don't even know the meaning of this symbol."

Kang Tu suddenly woke up and remembered: This is a symbol written in textbooks for later generations.

Li Xin also sat down and remained silent.

For a moment, none of the three spoke.

Zhao Zheng straddled four or five steps with long legs, with his elbows on the top step, supporting the weight of his entire body, and his feet on the ground at the bottom, taking up the entire length of the steps by himself.Still looking up, he suddenly said, "The pattern has changed."

Kang Tu felt a trace of despair in his heart, and there was even stronger hope amidst the despair. He didn't believe that Zhao Zheng could really trap them here.At this time, I heard his words and followed to see, and found that the pattern changed to "O".

The next pattern changed back and forth many times, and there were twenty letters in total.There was a pause in the middle for about 10 minutes without any change, and then the cycle started from "M", so they judged that eighteen letters were indeed a cycle.

Kang Tu sat cross-legged on the ground, held the fluorescent stick in his mouth, and put the notebook on his lap while writing, "So—they are: MOBMOCTBXDDLSQJBTDJL, well, exactly twenty."

Standing in front of him, Zhao Zheng squatted down and patted his shoulder: "Come on, now we need you to protect us."

Kang Tu: "..."

"Are you serious?" Kang Tu looked at him with dead fish eyes, "You know this sentence, in my opinion, means that we are finished."

"Believe in you," Zhao Zheng made a cheering gesture, "Don't give up on Kang Tsai lightly."

"Kang Tsai is really bad," Kang Tu hovered on the verge of collapse emotionally, "This is obviously a code, how could I know this."

Zhao Zheng looked down at the letters he had written, and pointed, "Is this a symbol, equivalent to a Chinese character?"

"It doesn't count," Kang Tu thought for a while, and explained, "There are two possibilities. If it is Chinese pinyin, it is more like the ancient Chinese phonetic notation ①. Lu characters can be annotated as: Li and Gu. Much like Li and Gu, they are the elements that make up a character; if they represent English, they are like our strokes."

Zhao Zheng didn't speak for a moment, thought carefully, and asked, "So I don't know which system this letter belongs to?"

"Yes," Kang Tu once again sighed that it was really easy to talk to him, and said, "I can't spell it either in pinyin or in English letters."

"I probably know a little bit," Zhao Zheng said in a conservative manner, "I've heard others say it, so it should be split up and formed into a code."

He pointed to the letters "B" and "D" and said, "These two symbols appear frequently. Could it be a relatively common word like '的'?"

Kang Tu marked the repeated letters with a pen, and said, "Go ahead."

"To crack the code, you should first determine what language it belongs to. Let's try one by one first."

Kang Tu looked up at him blankly: "How to try?"

"Read it again and see if there is a homonym?"

It makes sense, although Kang Tu thinks the analysis is absolutely correct, but no, there seems to be no meaningful homophony.

Kang Tu couldn't help being frustrated, and finally felt anxious in his heart. If the person who came was not him, but someone else, I'm afraid he has already cracked it by now.

Zhao Zheng still didn't make any waves, and he could even say relaxedly: "Well, you list all the alphabets, and let's see where the clue letters are in the middle."

Kang Tu didn't report any hope, but he still followed his suggestion and wrote all the letters on the notebook, circled the letters that appeared in the prompt, and marked the repeated occurrences.

When bidding, I suddenly remembered that when I played the decryption game before, there seemed to be such a link. At that time, the decryption was to give the player a template with holes deducted, and paste it on the letter below. The exposed letters are the password box. password.But now there is nothing, only a string of letters, life is still more difficult than a game, and you can't order giveup.

All the letters in the clues are marked, even the letters before and after, but in no way.

Li Xin also came over, stood aside and looked at it for a while, then suddenly said: "There are twenty in total, you write ten on each side, and write in alignment."

Kang Tu wrote as he said, and Li Xin pointed to the two letters aligned vertically at the beginning, and asked, "What do you mean?"

"..." Kang Tu paused for a moment, then said truthfully, "Damn it."

Li Xin:? ? ?

Kang Tu hurriedly took a step back and said, "Don't draw the knife! I didn't scold you, that's what 'M, D' means, you asked it yourself."

But this reminded Kang Tu, he rearranged the letters in the order of vertical alignment, but still couldn't spell anything.

Among them, only Li Xin had some experience with cipher texts, but he was helpless in the face of such unfamiliar symbols. No matter how smart Zhao Zheng was, he couldn't cross two mountains.

Li Xin squatted on the ground, pulled the book over with his broad palm, and said: "When we convey top-secret information, we often use some words as keys, and fixed words as replacement words. We also randomly shuffle the order. According to the composition of the text."

"Although this thing looks difficult, it's actually nothing, as long as you master the rules."

Kang Tu nodded, and then asked: "So what is the law?"

Li Xin simply said: "I don't know."

Kang Tu was fished out of despair and thrown into another despair.

He lowered his head again to think about the twenty letters. Almost all the methods were exhausted, and he tried to combine another letter.When he drew J and T, he ignored the B in the middle, and found that the letters in front of these two letters in the alphabet could form "is". The clue letters J and L in the alphabet just form "in". ②

He was taken aback for a moment and didn't move.

Zhao Zheng glanced at him and asked, "What?"

Kang Tu glanced again in disbelief, looked up at him and said, "I seem to understand."

Zhao Zheng smiled and rubbed his head: "That's great."

Kang Tu immediately marked the letter before the position of the letters given by all the clues in the alphabet. If the two letters spelled out just now were not a coincidence, then the order of these letters was indeed disrupted. .

He arranged all the clue letters alternately, and got the first row of letters: "MBOTXDSJTJ" and the corresponding alphabet is "LANSWERISI". ③

Unable to restrain his excitement, he clapped his hands, circled them twice and said, "The word 'answer', the word 'is'! We found it!"

Only two words were obtained, at least proving that their method was correct. Following this line of thought, they rearranged the remaining ten letters, but they couldn't get them out.

Kang Tu didn't think he had made a mistake before, and such a word is not a coincidence no matter how you look at it.

Zhao Zheng suddenly saw something, and said: "If the letters in front are indeed interspersed with each other, then we may have gone in the wrong direction."

He took the pen, drew two lines from the notebook, and aligned the upper and lower rows of letters obliquely, and said: "It may be interspersed in this way, and the first one below is directly moved to the second one above, and so on." Permutations, not one-to-one correspondence."

"There is such a situation," Li Xin affirmed, "and it is often used."

Kang Tu said weakly: "You, why, what, what, now, are you, just, say?"

"I don't understand this symbol," Li Xin said unmoved, "so I don't know if it can be used universally."

Kang Tu saw through him as if: "Forget about it."

Li Xin coughed violently.

Kang Tu sighed, stopped entangled with him, and rearranged the letters. At this time, the second row of letters was obtained: "LMCBDLQBDL".The corresponding alphabet is "NLBACKPACK"

Kang Tu excitedly drew two words: "It means 'backpack'."

What was cracked just now is a letter, and there is also an "i" that happens to be connected to the initial "n" to form an "in".

Kang Tu's mood at this time is simply indescribable, like a hot air balloon that keeps rising, rising, and the fire in his chest is about to burn him into a pile of ashes. It's impossible to succeed, but it's enough to make him feel proud.

In the end, they got the letter: "LANSWERISINLBACKPACK", only one "L" was left that could not be deciphered. In connection with the context, it is easy to judge that this letter replaced "the".

Kang Tu pressed the pen cap twice, tapped the notebook, and said with a [-]% smile: "Ladies and gentlemen, the answer to the riddle is: the answer is in the backpack!"

Zhao Zheng's feet were numb from squatting, he stood up and stretched, went to gather the backpacks of the three people together, and said to him, "Thank you."

He didn't exaggerate what he said to Kang Tu, and he gave a few words of encouragement when Kang Tu was at a loss at first, but he didn't say much when he finally figured it out. Both he and Li Xin behaved normally.

This kind of routine made Kang Tu extremely moved.He presumptuously thought that this was because they did not regard him as a burden, but really regarded him as a teammate and friend.

He doesn't think he's a liability when he's been doing nothing, so when he finally does something, he doesn't have the "he's finally useful" mentality.

The backpack mentioned in the answer was distributed uniformly when they entered the scene. They walked for a day with them on their backs, but they did not expect that there were important props hidden inside.

Zhao Zheng took out a huge thermos cup and shook his head in his hand: "I have long thought that this thing is a bit inexplicable."

The upper part of the thermos was protruding, and the lower part was suitable for holding. He pulled it hard, and somehow it stretched by about half. The color inside was red, which was exactly the same as the color of the drum.

Zhao Zheng casually threw it into the air, spun it twice before catching it, then walked to the drum and smashed it on.

①: Fanqie method: the ancient phonetic method, the first character is taken from the initial consonant, and the next character is taken from the final.

②: The encryption method used is the Caesar shift method.

③: The fence translocation method is adopted

The author has something to say: the ciphertext is M, O, B, M, O, C, T, B, X, D, D, L, S, Q, J, B, T, D, J, L, complete The cracked solution is THEANSWERISINTHEBACKPACK, using three encryption methods. I compiled it for a long time, but it is very difficult to express. Just write down the conclusion.