With Liu Fengtian's exclamation, Yang Tang clicked directly into the group with the help of hacker software, and then recovered all the chat records of the past month.

That's right, not to tune it out, but to restore it. This is because PP's own public server only keeps temporary files and session logs for seven days, and there is no content for the previous three weeks.

However, the computer thing is so magical, the online server has been deleted and overwritten, and there is often an imprint left on the local machine.

To put it simply, the chat history will form a copy of the text document in the system disk of the local computer, and this copy will often be deleted after the user (i.e., the computer owner) clicks [Delete], along with the file path and folder pointing to the copy.

So here's the problem.

Will deleted files disappear from the computer's hard drive immediately?

No.

Deletions from online servers are not immediately wiped out after clicking "Delete", but are hidden in an area of the hard disk (or array).

This is like tracheitis, after this attack, after a few days of injections and hanging water for a few days, it seems to be cured, but in fact, it leaves the root of the disease, and when you get a cold, you get, and the tracheitis occurs again.

In the same way, after the files on the online server are deleted, it is as if the contents of the files are encrypted and simplified and thrown into a hidden recycle bin on the hard disk (or hard disk array), and if the administrator recovers the files in time, the deleted files can be retrieved. However, due to the huge amount of data exchange and frequent storage on the online server, a large amount of data can easily occupy and overwrite the storage space of the so-called "hidden recycle bin", resulting in the deletion of files that are too old to be restored.

To put it bluntly, it's like the graves of the ancestors have been planned, the graves have been dug on the highway, the graves have been bulldozed, and then after the highway is completely completed, you want to restore the graves, is it possible? I'm afraid that even if you let yourself locate it, you may not be able to find where the original graveyard is!

In the same way, it is not so easy to use on a local computer, because the system disk is often the one that the computer user clicks the least. Of course, less chaos does not mean that the data exchange of the system disk is less, but the bottom folder of the storage path of the PP company to generate the copy of the conversation is generally named after the date, for example, today is March 12th, so the folder automatically generates the name "20180312", so that the path of the folder where the copy of the conversation content is stored is different every day, so it is difficult to overwrite the "copy of the conversation content" without filling the system disk The storage path, that is, its roots have not been completely bulldozed and then the highway is paved, so it can be restored.

Liu Fengtian didn't know much about this principle, but he also vaguely listened to the technical masters in the game, so when Yang Tang kept pulling down the mouse wheel to view the text, Liu Fengtian stared at the back of Yang Tang's head, but he was a little vigilant in his heart. Don't look at the current TV serial killers making a lot of trouble, but the purpose of the other party's revenge and killing seems to be very clear, after all, none of the four people who died had property loss. But in Liu Fengtian's opinion, with Yang Tang's analytical ability and technical level, coupled with his explosive combat effectiveness, if he wants to commit a crime, I am afraid that it will be difficult to subdue him, which is really a huge potential threat!

"Lao Liu, look here!" Yang Tang suddenly called Liu Fengtian, and when he saw that no one answered, he couldn't help but half-turn around and look back: "Lao Liu, Lao Liu, what do you think?

Liu Fengtian came back to his senses at this time, and he was not embarrassed by Yang Tang's inquiring gaze, but said bluntly: "With your kid's hacking skills, it's enough to go directly to the banking system to transfer money, what kind of technical consultant are you doing!"

"What? I will order hacking skills, are you jealous?" Yang Tang raised his eyebrows.

"You have a little hacking technology?" Liu Fengtian twitched the corners of his mouth, "It's a little bit of technology, then you can also reason and analyze, Luo Ji's thinking is too strict, and your combat effectiveness at the scene of the assault and arrest is also very good, put all these things together, I think your kid is a humanoid weapon! It's okay if you abide by the law, if you kid makes a mistake and goes astray one day, it is estimated that no one can cure you!"

Yang Tang was stunned when he heard this, and immediately said: "Lao Liu, shouldn't you be pulling a calf, right? With the density of buildings in modern cities, a nuclear bomb with a yield of 100,000 tons of TNT can destroy a city, and no matter how powerful I am, I can't compare to a nuclear bomb, right?"

Liu Fengtian was right when he thought about it, he couldn't help but nodded, and changed the topic: "By the way, what are you asking me to see?"

"Look here...... The four deceased, including the one just hung up today, and An Zhiqin's pp number, I have already found out in the group, but there are many people in this group, hundreds, and there are also fifty or sixty people who are usually online, so whether the four deceased have communicated with An Zhiqin, we have to continue to investigate, in fact, even if there is communication, I am afraid that several deceased people will not be able to think of An Zhiqin's wolf ambition. ”

"Today, the TV station is dead, and An Zhiqin is still in the bureau!" Liu Fengtian reminded, "Brother Yang, are you so sure that An Zhiqin is related to the entire serial case?"

Hearing this, Yang Tang stared at Liu Fengtian for about two seconds before replying, "Yes." ”

"Why?"

"Based on my intuition, the first time I saw An Zhiqin, I felt that he was involved in the whole case......"

"Being implicated doesn't necessarily mean that you are the murderer!" Liu Fengtian subconsciously refuted.

"Hey, Lao Liu, pay attention to your position, which end of the hell are you?" Yang Tang half-jokingly.

Liu Fengtian was stunned for a moment and said: "I am [reasonable] at one end, you have no basis to guess, why should I be with you?"

"What do you mean by unfounded speculation?" Yang Tang wanted to laugh a little, "Lao Liu, you were also present when An Zhiqin was arrested, and now you have seen what the situation is? Although there are no dead people, but until now, there are still so many special police brothers lying in the hospital, do you really think that the explosion was purely accidental as An Zhiqin explained?

But the problem is that An Zhiqin has refused to spit until now...... We can't catch him, and we can't get it!" Liu Fengtian said distressedly.

Yang Tang was waiting for this sentence, and immediately hit the snake and said with a stick: "Or ...... I'll try you for you?" As far as the signed advisory agreement is concerned, he, as a consultant, does not have the power to interrogate the suspect, otherwise he will be directly scolded by [evil eye], and he will not be convinced.

Sure enough, Liu Fengtian said: "It is definitely illegal for you to face the suspect for interrogation, but you can enter the interrogation room together as an interrogation deputy." ”

Yang Tang was not surprised at all, and responded: "It's okay, but it's not now!"

"What do you mean?" Liu Fengtian frowned.

"Because I found an unfamiliar PP number in An Zhiqin's chat history, and this PP number is also in the group added by the four victims. Yang Tang said, pointing to a copy of the document he had just clicked on on the computer screen, "It's the PP number with the tail number 1914." ”

"Can you see what he and An Zhiqin have talked about?" asked Liu Fengtian.

"I'm trying, but the recovery is not too optimistic, because they were friends a few months ago, and I'm afraid that the content of the conversation has long been covered by other content. Yang Tang was a little helpless, although he was strong, he was not a god after all, and he couldn't be perfect.

Liu Fengtian muttered: "Since a group has been added, it is not unusual for everyone in the group to have a private chat, right? How can you suspect this 1914?"

Yang Tang laughed and said: "This is not a lice on the monk's head, it is an obvious matter, I don't believe Lao Liu, you can see it yourself, according to the records, all the PP numbers in this group, only this 1914 has been privately chatted with An Zhiqin alone, and there is no one else." ”

Liu Fengtian didn't believe in evil, personally operated the mouse wheel, looked up and down An Zhiqin's private chat text, and found that only 1914 was in the group, and the rest of the people were either An Zhiqin's personal friends or selling advertising and pulling business.

"Okay, the (hacker) auxiliary software has been cracked, let's take a look at what An Zhiqin talked about with this 1914!" Yang Tang finished speaking, and casually clicked on a newly generated text document on the desktop, and it turned out to be a large blank and large garbled characters.

Liu Fengtian was a little dumbfounded: "This, how much does this mean?"

"It means that the chat between the two has been encrypted by algorithms, and if you want to crack it, it may take a long time, and it may not have the best effect, it seems that there is indeed an ulterior secret between these two people!" Yang Tang pouted.

"Then what's the matter, won't you crack it?" Liu Fengtian said unwillingly.

"Let me tell you this, Lao Liu, there are dozens of algorithms that can be encrypted, there are dozens of conventional ones, hundreds of kinds that are not commonly used, and they are constantly innovating every day, just like an unknown equation containing four mixed operations, you can make up a lot of tricks at will, and some encryption algorithms can be encrypted but can't be decrypted backwards, why do you bother with it?"

"Then isn't the clue of 1914 broken?" Liu Fengtian said with a hesitant expression.

"How can it be broken? Isn't there still a PP company!"

"What can they do?" Liu Fengtian was puzzled.

"What can they do? They can do a lot more. Yang Tang explained slightly, "Isn't it true that even the mobile phone number is real-name now, and the same is true for this PP number, so I don't need to say more about the rest!"

Liu Fengtian was stunned and said, "It's that simple?"

"Nonsense!"

"Then I'll contact PP right away. ”

"Oh yes, Lao Liu, you asked someone to send me the details of An Zhiqin's girlfriend, and I will study it!"

Liu Fengtian, who was about to leave, was stunned for a moment and said, "Do you really think An Zhiqin's girlfriend has anything to do with the TV station's case?"

"Of course, the motive for the killing, Lao Liu!"

"I see, someone will send the information soon!"

Sure enough, within ten minutes of Liu Fengtian's departure, a policewoman from the archives came over and handed over a thick stack of folders: "Consultant Yang, this is given to you by Team Liu, all the files of the suspect An Zhiqin's girlfriend Tang Shuang, please sign for it!"

After Yang Tang signed the name and date on the book handed over by the other party with his left hand, he took the whole folder over, sat down and looked through it slowly.

Tang Shuang was in a car accident three years ago. At that time, the driver of the collision was drunk driving, did not escape, took the initiative to help treat Tang Shuang, and surrendered, so in addition to civil compensation, the drunk driver was sentenced to two years and six months in prison, but after serving a year in prison, due to good behavior, the sentence was reduced by half a year, and parole was allowed at the same time (generally half of the sentence can be applied for parole).

This is the content of the first case file, and it can be regarded as one of the contents that Yang Tang is most concerned about, but there is nothing wrong with it literally, but Yang Tang feels that something is wrong in his heart, and he can't help but take out his mobile phone and call Liu Fengtian: "Lao Liu, you help me check, where is Ji Weimin's current place!"

"Who are you talking about?"

"Ji Weimin, the driver who killed An Zhiqin's girlfriend Tang Shuang three years ago by drunk driving!"

"Hear clearly, I'll find someone to check ...... for you"

Ten minutes later, Liu Fengtian's phone call came back: "I found Brother Yang, the Ji Weimin you care about has already gone abroad last month, he took a connecting flight, and his first destination is Dongying Osaka ......"

Hearing this, Yang Tang couldn't help but scold: "Leak!"

You know, Osaka is one of the two major international airports in Toei, and there are hundreds of international flights to and from various countries every day.

"By the way, Lao Liu, have you asked people to check the bottom of this Ji Weimin?

"This is what I didn't finish just now but it's puzzling......" Speaking of this, Liu Fengtian stopped again and gasped for breath.

"You don't sell Guanzi, hurry up!" Yang Tang said impatiently.

"Ji Weimin is the only son in the family, his parents are laid-off workers, and they make a living by setting up stalls, and he had just worked at the TV station for less than half a year when he hit and killed Tang Shuang by drunk driving, and he has not yet turned regular, after he was sentenced to prison for drunk driving, his parents' living conditions have improved day by day, do you say strange?"

"It's not strange at all!" Yang Tang said indifferently, "On the contrary, I have a new perspective on the whole serial case!"

"What's new?"

"It's very simple, this Ji Weimin is a key figure in a series of cases, and in the car accident, he should also be a top bag!"

"How do you say that?" Liu Fengtian said strangely.

"How else can you say, Lao Liu, didn't you say it just now, his parents make a living by setting up stalls, so whose car does he drive?"

As soon as this question came out, Liu Fengtian suddenly realized.

"In this way, most of the car was led by him on the TV station, but we have no substantive evidence!"

"Old cases, then it depends on Lao Liu's ability, I only provide the direction of the investigation!" Yang Tang shook off two-five-six.

"Okay, I'll ask the old subordinates of the Transportation Bureau......"

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