After being stiff for a few seconds, the wooden fish returned to normal and accepted the reality.
Chu Yu was still stunned, as if he didn't recover, and seemed to be thinking, staring at the screen intently.
Muyu put his hand on her shoulder, "Boss, it's alright, maybe it's really like what Xiaobang said, after finding out the truth, Xiaohuaihua's sentence is even heavier. past."
Chu Yu rested his hands on the computer table and pointed at the screen, "No, I think it's possible to dig deeper."
"An old man in his 70s?"
The information shows that the owner of the ID card is Jiang Jianzhou, who is 70 years old and lives in Weini Community, Linquan North Road.
Chu Yu nodded, although affirmative, but his expression was confused: "I think the elderly are also suspicious."
"Chu, if she is forty or fifty years old, it is still possible, but in her seventies or eighties, she may not even be able to use a smartphone. The possibility of helping Xiao Huaihua is too small. Even if she wants to find an accomplice, why should she Can't think of it, looking for an old man who may not be able to read clearly?"
"So you think this Comrade Jiang Jianzhou is completely ignorant?"
Muyu looked at the transaction record given by the bank and said, "It should be, in fact, I think that the probability of finding X in this way is relatively small. Although Xiao Huaihua has a bank card, a payment account, and an ID card attached to it. and phone numbers, but these are not necessarily X's, or she may be stealing other people's information for her own use."
Chu Yu took the bank records in her hand and glanced at the time, "This card has been issued for thirteen years and has been used in Wangjiang City, but it started two months ago, and the transaction locations are located in two provinces and cities. , Luoyu City and Jinling City, this is also in line with the trajectory of Xiaohuaihua, and it is definitely used by her. This shows that this card was first held by Jiang Jianzhou, and then transferred to Xiaohuaihua. If the old man took the initiative to take the card Give it to her, then he may have dropped the card and was picked up by Xiao Huaihua, but in that case, why didn't he report the loss?"
"His card is still a magnetic stripe card, it has not been replaced with a chip. The principle of the magnetic stripe card is like a magnetic tape, with low technical content and no encryption key. It can be copied. Maybe the old man's card was copied, but he didn't notice it. "
"But after copying the bank card, do you still need a password?"
The corners of Muyu's mouth curled slightly, showing the proficiency of "hackers who have not debuted": "There are many ways to obtain passwords, and it is generally easier for the elderly to set passwords, what birthdays, consecutive numbers, and I think Xiaohuaihua has the ability Copy the other party's bank card, and certainly have the ability to get the password."
Chu Yu expressed doubts again: "But the use of the payment platform requires a mobile phone verification code. Whether it is a bank card or Alipay, it is bound to the old man's mobile phone number. If the old man did not provide it, how did she know?"
"This can be achieved. If the old man accidentally clicks the link she sent, the Trojan program is installed in the phone, and the corresponding permissions are turned on, then she can know all the verification codes."
After Muyu finished speaking, he turned his attention to the "witness miracle" computer page again, "Maybe Xiao Huaihua is staring at him because he is an old man, has no knowledge of the Internet, can't check consumption records, and is unlikely to find that his ID card is bound. suspicious accounts, so she can get away with it easily."
Chu Yu frowned slightly, pondering her words, silent for a while, and said to Mu Yu, "Call Xiaobang and Datuo over."
Seeing her like this, Muyu knew that there was something to discuss, so she didn't say much, and immediately contacted the other two.
Song Qingyang and Fang Datuo only knew that Chu Yu had a result in the bank, but they were busy with each other, so they didn't gather in the office of the technical department. When they heard the call, they put down their work and rushed over.
As soon as Song Qingyang entered the door, she inquired about the results. Muyu showed her Grandpa Jiang's information, and she pouted, "Who are we looking for? The mysterious person who texted?"
Fang Datuo sat down and brushed his hair, "I've thought about countless possibilities, men, women, children, teenagers, but I just didn't think about the old man. Do you suspect that he is not X?"
Muyu looked at Chu Yu and didn't speak for a while.
Chu Yu stared at the center of the table, his eyelashes blinked occasionally, his eyes solemn, "Yes, we now have very little information about X, just a text message, if I have to make a psychological portrait of X, I think he It should be a teenager, fifteen to twenty-three years old, with a criminal history, directly or indirectly involved in a crime, but not caught, introverted, timid, reluctant to talk, simple in interpersonal relationships, seemingly simple on the surface, but familiar with the opposite Investigative methods, know how to evade the police."
The three officers looked at her and were stunned, "Just one text message, five numbers, how many did you put out?"
Chu Yu didn't answer, her eyes were a bit mysterious - she had a guess about Xiao Huaihua's four-year experience, so she guessed X's characteristics based on her experience.
Fang Datuo: "So, Jiang Jianzhou can be ruled out?"
"Muyu and I discussed it just now, guessing that he may not know it, but was stolen and used the information by Xiaohuaihua."
Muyu: "Yes, although Xiao Huaihua used his bank card and payment account to bind his mobile phone number and ID card, these can be achieved through illegal means."
Chu Yu nodded, and continued her words: "I first thought that X was the one who provided Xiao Huaihua with financial support, because her situation is different from ordinary economic fraud, and she needs a stable and reliable source of income, and to achieve this One point is to have a real ID card as a guarantee. First, she can't use her own ID card, and she doesn't have an ID card; second, if she steals someone else's ID card, if the owner of the ID card finds out, she will report it to her. Financial institutions or the Public Security Bureau responded that once discovered, her source of income will be cut off immediately, and there is a risk of being caught by the police;
Third, I have thought that she may find loopholes in banks and payment platforms, but like payment platforms, the security factor is extremely high, and the programmers are at the top level in China. almost impossible. As soon as Xiao Huaihua takes action, she commits crimes for a long time, with a time span of several months or even longer. During this period, she has to try to get close to the potential victim of the attack, and she has to avoid the pursuit of the police. It is impossible to have time to worry about money, so she started , it is necessary to ensure that their economic sources are very stable and absolutely cannot be discovered and traced. "
Muyu understood what she meant, "So you guessed that her source of income is a real person. The ID card, payment account number, and phone number are all real. Even if they check, they can't see any problems?"
Chu Yu nodded, "Combining with that text message, I suspect that the source of income is X."
"But now the source of income has proved to be an old man. You just speculated about X's characteristics, and you are a teenager again. Does it mean that we have found the wrong person? Xiaohuaihua didn't ask X to help her?"
Chu Yu narrowed his eyes, "Muyu just said that Xiao Huaihua may have copied the old man's bank card, because the card is a magnetic stripe card, since the chip card was issued, the bank has been urging users to change the card, like this old man, although Now the magnetic stripe bank card can still be used, but the bank will send him a text message. Every time he goes to the bank, the teller may also suggest him to change the card. If one day he updates the bank card, the card of Xiaohuaihua will be used. Wouldn't it be scrapped?"
"So you suspect that Jiang Jianzhou is also suspicious?"
"It seems that we can't get rid of the suspicion now. It's safer for us to check it out in person."
The four negotiated and started to act, but this time, the heart was heavy, and it felt a little bit of a back-to-back battle. If the old man couldn't find anything again, the Sophora japonica project might really need to draw a sentence, which should actually be an ellipsis, followed by a string of unknown Solve the mystery.
Afraid of attracting the attention of the provincial department, they still did not drive this time. They took a taxi to the Weini Community on Linquan North Road and went to the property office, explaining that the police investigated the case and obtained the specific unit number of Jiang Jianzhou.
Before he came, Chu Yu was already familiar with some of his information, such as his spouse had passed away, he had a son and a daughter, both of them were over forty, and he had a family of his own, and he was now living alone.
When they got to the downstairs of the unit building, Song Qingyang was waiting outside, Chu Yu and Mu Yu went upstairs and knocked on the door.
After a while, a questioning voice came from inside: "Who is it?"
Chu Yu showed the police officer's certificate, knowing that it should be visible inside: "Hello, Mr. Jiang, we are the police of Wangjiang City Public Security Bureau. We are in charge of the investigation of an important case. I want to ask you something. Can you open the door?"
The door was quiet for a few seconds, Chu Yu was about to speak again, but the door opened, and Jiang Jianguo stood behind the door and welcomed them in.
The first impression he gave was that he was tall and slender. Although his hair was gray, he was well groomed. He was a particular old man. Chu Yu had seen the photos of him when he was young, and he looked dignified and grand. Although Fenghua was gone now, his back was a little hunched, but his temperament was still preserved.
After Chu Yu and Muyu were seated, the old man made tea for them, as if receiving a distinguished guest.
The two of them were sitting in the middle of the sofa, and Jiang Jianzhou was sitting on the side. He didn't look nervous and smiled amiably: "Hello, two police officers, what do you want to ask?"