Is it coming?

In one of the police offices, the leader of the team in charge of various detective tasks sat at a conference table in an emergency meeting about the recent murder.

"Hey, have you heard, this time it seems that the Yan team personally found someone, saying that it is a cryptographic expert or something, and it seems that there is a degree in psychology!"

"Eh, really? Where did Team Yan find it? Psychology and cryptography are two completely unrelated disciplines. ”

"The situation is still unclear, but listening to Yan Feng's meaning, it seems that he will work with us to solve the case."

The group leaders discussed a lot, but Liu Wenyu and Xu Wenxin glanced at each other, showing nervous and expectant expressions.

INTERVIEWER This time, can Mr. Wen behave as calmly as usual?

You know, this time it's facing experts in this industry, I'm afraid even Mr. Wen will have some stage fright.

Liu Wenyu looked slightly shaken, and seeing this, Xu Wenxin gave him a firm look.

- Don't worry, I believe in Mr. Wen, he will definitely be able to.

This is not a comfort, but she feels like this - Wen Yifan gives her the feeling that this is the case, that sense of trust has developed so far, and it has long become a fact in her heart, as if even if the sky falls, as long as she stands by his side, nothing will happen.

Elegant, calm, no matter what situation can be encountered to maintain a neither humble nor arrogant attitude, such a person, what is not trustworthy?

The demonic seed has already taken root and sprouted unconsciously.

"Quiet, as if coming."

A voice sounded, and when everyone heard this, everyone fell silent, and the computer placed in the conference room also opened voice chat at this time.

"Hello everyone, I'm a cryptographic expert who has just joined the investigation of this case, you can understand that I am a relatively boring detective, and I am a detective who is interested in this case - before the arrival of regular cryptographic experts and psychological profilers, I am responsible for deciphering the code and psychological analysis, new arrivals, please bear with me." In the police station's office, a slightly ethereal, emotionless electronic voice echoed, "By the way, for security reasons, I won't give out my name, you can call me 'W'." ”

- W, does it symbolize the surname "Wen"?

Xu Wenxin smiled silently, and returned to normal in an instant.

"There's information about this case, Captain Yan has already sent it to me, and I've read it all over the past few years," the voice paused, and then said, "First of all, I would like to ask you to stop investigating the actions against Catholics - this is a waste of police resources, and it has no real effect at all. ”

As soon as these words came out, everyone talked about it, and Wen Yifan seemed to have expected this situation a long time ago, just patiently waiting for everyone to calm down.

"Why?" A voice asked the doubts in everyone's hearts.

"First of all, I want you to tell me, why are you so obsessed with Catholicism?" Wen Yifan asked.

"W, I thought you'd read the material carefully," a police officer rummaged through the materials on the table with some impatience, "First of all, with regard to this, we have determined that the murderer used 'soul-cleansing' torture on four adults by examining the causes of death of the five victims, which is mostly used by the Catholic Church to punish the soul filthy, and that the children's sexual organs were artificially cut off and their backs were sealed, which also corresponds to what the Bible believes." Angels are genderless', so we are sure that the murderers were Catholics. ”

After saying that, he closed the information and looked at the computer quietly, as if waiting for an explanation from the other end.

"Very good rhetoric, there is no problem with the logic, and the conclusions drawn seem to be true," Wen Yifan was not annoyed, but continued to say in that calm voice: "But I think that the person who made this report is either an negligent person or an idiot of Greek mythology." ”

Without waiting for everyone to react, he continued: "Please see the photo of the crime scene again, Officer Liu, please put that photo on the big screen." ”

The projector mapped a miserable photo, Wen Yifan didn't stop too much, and explained: "What do you think about the poisonous snake that the child is holding in his hand?" ”

"After yesterday's discussion, we think that this should be something that the child's hands are holding tightly due to some kind of survival consciousness before he dies, and if it is artificially stuffed, there will not be so many traces of internal buckles on the toy snake." A policewoman who looked to be in her thirties replied.

"Yes, when we are on the verge of death, our hands do subconsciously want to grasp something, this is instinct, but do you feel that grabbing such a toy snake is a very abnormal thing?"

"Please note that in addition to the four adults who were tied up in the bedroom and poured boiling water to death, the child's first place of death was in the living room - in the center of the living room to be exact, and the murderer showed that he knocked everyone out and killed the child before they could wake up, so how could this child catch such a snake in such an open space in the middle of the living room?" The electronic voice slowly said the abnormality, "Besides, after my analysis, I can basically judge that the murderer's arrangement of the scene is extremely accurate, and even has a sense of obsessive-compulsive disorder, so how can a person who kneel at an angle of forty-five degrees allow the deceased to hold an object that does not belong to this scene?" ”

"There is only one answer - this item also has its own meaning."

"I just happen to know what that means."

An oil painting suddenly appeared on the computer, and Wen Yifan continued: "This allusion comes from the story of Hercules, the god of Hercules, in Greek mythology. ”

Hercules was the illegitimate son of Zeus, who had gained divine powers by sucking Hera's, and when Hercules learned who Hercules was, Hera regretted not getting rid of him. Then she sent two terrible vipers to climb into the palace to kill the child, trying to strangle him in the cradle, but unexpectedly, the young Hercules had incomparable divine power because he sucked Hera's milk, and subdued the two poisonous snakes, Hera had to give up. After a brief dictation, Wen Yifan went on to explain: "'The Son of God, even at an early age, has the ability to subdue poisonous snakes', this is the main theme of this story, but when placed on the scene, it seems extremely abrupt - the Bible and Greek mythology are completely different systems, and a devout Catholic will not believe in these two systems at the same time. ”

"In the end, then, there is only one explanation, and what the criminals want to express is that 'when the great Son of God comes, the sinner should be judged and bow down at His feet.'" The cold voice made everyone shudder, "And when I analyzed his heart, I had a different conjecture - when he set up the scene, he gave me a sense of showing off, as if some company was showing off its products with a trademark, and he was also showing off: 'Behold, this is the child of God that I have created!'" ”

The room seemed to be getting a little cold, and individual police officers couldn't help but shiver a few times, and it was obvious that the cruelty of the murderer this time deeply shocked everyone.

"So, if there is information about Catholicism, I will say so much first, because today is only 48 hours before the case was discovered, and there is not much useful information, so I can only analyze so much, and next, I will focus on the knowledge of classical codes."

"Passwords are a technique used to obfuscate and turn normal, identifiable information into unrecognizable information. Cryptography is an ancient and emerging discipline with a history of thousands of years. The development of cryptography has probably gone through three stages: the classical cryptography stage, the modern cryptography stage, and the modern cryptography stage. The classical cipher stage refers to the period between the generation of ciphers and the development of modern ciphers. ”

"In the final analysis, there are two main methods of classical cipher encoding, that is, substitution and substitution: the letters in the plaintext are rearranged, and the letters themselves do not change, but their positions change, and the resulting cipher is called a replacement cipher. The simplest substitution password is to reverse the alphabetical order in the plaintext and then truncate it into a fixed-length letter group as ciphertext; The substitution password is to replace the characters in the plaintext with other characters, the most common of which is what we call 'Morse code' today. ”

When the popular science was over, Wen Yifan first stopped for a while, gave everyone time to digest, and then said: "Then, let's go straight to the point!" ”

With his order, a string of Morse codes immediately appeared on the big screen, and everyone stared at this string of characters, and their expressions were a little nervous.

"We can all know that this kind of character is commonly found in Morse code encryption, and with the gradual development of technology, more and more software has been developed, so after using no less than five Morse code decryption software, under the condition of ensuring accuracy, I came up with that confusing plaintext."

Another string of garbled text, and everyone looked at the computer, as if expecting his next speech.

"Obviously, such plaintext is meaningless, and there is no way to decipher any useful information, which means that this is still not the information we want, and if this happens when deciphering classical codes, it means that the other party uses multiple layers of encryption to make the plaintext that is wanted to be transmitted more difficult to decipher."

"And I think that this number of layers should be nine!"

"In other words, it's a classical cipher with nine layers of encryption – even if it were exhaustive with computer power, it would take a lot of time, so it now seems to have to be deciphered manually."

Everyone fell silent, through the study of classical codes in the past few days, they knew very well what a nine-layer encrypted password meant - in a short time, there is no possibility of cracking!

"But fortunately, the prisoner also left another piece of information - that little poem." Wen Yifan seemed to have anticipated the situation of blindness, and continued: "Next, I will interpret some information from this little poem that will help us decipher. ”

"In this world of dots and lines / A god has descended into it / He has sprinkled nine particles of light with wisdom / And with the original face of the world / He spreads his white wings in the distance / Awaits the challenge of the arrogant." At this moment, the emotionless electronic voice, reading this poem like a praise to the gods, gives people an extremely disobedient, but slightly weird feeling, "Let's start with the first sentence!" ”

"'In the world composed of points and lines', just take out this sentence, in which 'the world of points and lines', it is easy for us to think of the first layer of encryption of this cipher - Morse code encryption, but with the popularity of Morse code, this is not a layer of hints in itself, but if we look at it backwards, we will find that the meaning of this sentence is to let us understand that this little poem is the key hint for the decryption of that string of passwords."

"Taking advantage of the popularity of Morse code, deliberately leaving this kind of superficial hint in the first sentence, I can't think of any other possibility except this case, so the meaning of the first sentence, we have already come to the conclusion." The voice of sorting out the information came from the computer, and he continued: "The second sentence, 'A god has descended here', the god can be understood as the meaning of the son of God, and from the information we have so far, this sentence does not seem to have any special meaning - of course, it is not ruled out, but we have not found it." ”

"This is followed by the third and fourth sentences, and I suggest that you read them together, so that they become 'He sprinkled nine particles of light with wisdom / And with the original face of the world,' so that the meaning of this passage is actually obvious." After a pause, he analyzed them one by one: "Obviously, the 'world' refers to the Morse code of the first sentence, and the gods sprinkled nine particles of light with wisdom, and with the original face of the world, can it be understood as 'as long as you use wisdom to unlock the nine-layer code, you can turn this Morse code into the plaintext I want to convey to you'?" ”

- I see!

Liu Wenyu showed a look of sudden realization, and his gaze at the computer also revealed a little unusual color.

"The last two sentences, after my careful investigation, I think I can basically rule out the possibility of the meaning contained in them, the god with open wings means the dead child, and the criminal will challenge the god and call it 'arrogant', so it can be understood as ......" Suddenly lowering his voice, Wen Yifan said in a slightly mocking tone: "'You policemen who dare to oppose me are really arrogant people'! ”

"That's right, I feel this way too," Liu Wenyu nodded, "Speaking of which, w, you know what?" Just now, the murderer sent a letter to the police station. ”

Correspondence?

Wen Yifan on the other end of the computer suddenly came to his senses, so he asked, "What is the content?" How did you send it? ”

"The letter was dropped at the door of the police station, according to the surveillance, it seems that a child threw it in, and after questioning him, it was learned that it was a person who couldn't see his face clearly and asked him to put it here, and the clue was found here, and it was interrupted," Liu Wenyu sighed, and then said: "The content of the letter is roughly to let us publish the password he wrote down in the newspaper, and at the same time strongly encourage everyone to decipher his password - the password hides his important information." ”

- Newspaper announcement, so it seems that the target of the challenge is not the police station, but someone in Yunhe City.

"It seems that he really wants to challenge something, and in this way, it may not be able to meet his requirements - what if, as I thought, maybe not releasing the password can prevent him from continuing to commit crimes?" After thinking about it for a while, Wen Yifan quickly made his own judgment, "In short, what we need to do now is to conduct a large-scale investigation of the surveillance network at the scene of the crime, as well as a large number of visits and investigations in the scope of the crime you have demarcated - of course, this is just my suggestion as a layman, except for the content related to classical cryptography, you can all ignore my other words." ”

"Wait, w, you mean, the prisoner will continue to commit crimes?" The slightly impatient officer asked.

"Yes, or perhaps, it's almost certain." Wen Yifan replied in the affirmative, "As I said, this password is a classical code with nine layers of encryption, and it is extremely difficult to decipher, so the hint has become the key, and in this case, the hint given to us by the criminal is obvious, that little poem." ”

"But now, this hint is obviously incomplete, and combined with the content of this first poem, I can almost tell you with certainty: there will be more murders like this, and there will be new verses, so that the first little poem hints at the encryption of the first layer of Morse code, and so on...... "The calm electronic sound contains a cold that is suppressed to the point of suffocation," and in the future, there will be eight more such murders! ”

At this moment, everyone's brows were tightly locked, and the situation they were most worried about became a reality.

"In other words, the current situation is a protracted battle with the criminals - only by breaking the code before nine of these cases can the criminal be considered to have won the crime, otherwise, the whole thing is likely to end with the crime of disappearing after completing the nine murders, in which case it will be very difficult to find him again."

Like a basin of cold water poured on everyone's heads, Wen Yifan's words undoubtedly completely extinguished everyone's luck - if the criminal who let go as he said, then it is obvious that everyone here today will not escape the blame.

"But don't worry, I'm doing my best to crack the code left by the criminals, and I already have some clues, maybe by the next meeting, I'll be able to crack another layer." His voice softened slightly, Wen Yifan chuckled, and continued: "Don't worry, no matter how fierce and cunning he is, we will definitely catch this criminal, because ......"

"Justice will prevail."

The corners of his mouth curled evilly, and he spat out these four words softly, but he was not ashamed at all.

Evil lives on.