"Thankfully, we didn't make a trip for nothing today." As soon as he sat down in the café, Pang Jitong said to Fu Liangtao, who was already waiting there.

After hearing this, Fu Liangtao responded, "I think so too. Tell me first, what did you find? I saw that in the afternoon, you were quite serious when you checked your phone for Xu Ningzhi."

Pang Jitong nodded, and then explained: "Whether it is Li Bingde or Zhou Muqing, the two of them began to be emotionally unstable after being harassed by the Internet for a period of time. And during the period of getting along with Xu Ningzhi just now, she seemed to be in a good mood all the time, and only when she talked about the business in the shop, she was a little embarrassed.

In addition, when I checked Xu Ningzhi's mobile phone, I didn't find anything abnormal in her mobile phone. Since there were no other tools at the time, only a preliminary examination was carried out. I found no suspicious apps or app installs on Xu Ningzhi's mobile phone, and when I checked the permissions granted to the apps on my phone, I didn't find any apps suspected of being Trojans.

Based on the above two points, it can be temporarily determined that Xu Ningzhi is not one of the victims."

"So, have you noticed Xu Ningzhi's reaction after hearing that he needs to check his phone?" Fu Liangtao asked.

Pang Jitong then recalled in his mind and said, "At first, she seemed to be a little resistant, but then she didn't know why, and suddenly changed her mind and agreed. We didn't even say anything."

Fu Liangtao nodded and said, "That is, Xu Ningzhi's reaction is very debatable. Judging from Xu Ningzhi's reaction when she was questioned, perhaps because she has been dealing with various guests all year round, her mind is more lively and she is good at observing words and feelings. She didn't mean to be pretentious, she was just used to it, so that she could guess what the other party wanted or wanted to say at once.

However, when it comes to checking her phone, her reaction is quite unnatural. Since she thinks it is inappropriate, she has every right to refuse. Why do you suddenly change your mind and there is no rejection?"

Then, Fu Liangtao handed the earphones to Pang Jitong and said, "Next, I will play you two audio clips, the first audio is the message I received from Xu Jingjia before, and the second is what I heard when Xu Jingjia called me this afternoon."

Pang Jitong then took the headphones, and as soon as he listened to the two audio clips, he asked, "If the first audio was recorded in the voicemail box on June 30, then wouldn't it mean that Xu Ningzhi was lying? Xu Ningzhi claims to have not met Xu Jingjia for several years, but in fact, he is not?"

"For the time being, I can think so. After all, what Xu Ningzhi said is different from the information we have. Judging from this contradiction, Xu Ningzhi definitely knows something." Speaking of this, Fu Liangtao paused, and then said in a deep voice: "Sometimes, a person is too knowledgeable about words and feelings, and his mind is too lively, but it is easier to show flaws."

"Since Xu Ningzhi still met Xu Jingjia, and Xu Ningzhi also said that Xu Jingjia gave her gifts in the early days of her pregnancy. Could it be because Xu Ningzhi actually has a good relationship with Xu Jingjia, so he tried every means to hide it for Xu Jingjia? Moreover, Xu Ningzhi secretly hid from the other three to deal with Xu Jingjia?" Pang Jitong said his guess according to Xu Ningzhi's reaction just now.

After thinking about it, Pang Jitong added: "According to the previous investigation, I thought that Xu Ningzhi and Zhou Muqing had a better relationship, but I didn't expect that when Zhou Muqing's matter was mentioned, Xu Ningzhi's reaction was even more casual than Xu Jingjia's, as if he was talking about strangers."

After listening to Pang Jitong's statement, Fu Liangtao did not fully agree, but said conservatively: "There is also a possibility, but there is no evidence of this now, and the only thing that is certain is that - no matter what, Xu Ningzhi did lie."

"By the way, you just went to the library to check Xu Jingjia's borrowing and returning records, did you find anything new?" Fu Liangtao asked again.

"Yes." Pang Jitong replied. "In addition to novels, some books related to hacking techniques and electronic data forensics have been borrowed by Xu Jingjia in the past two years."

Fu Liangtao didn't have much expectation for Pang Jitong's findings, but when he heard that Xu Jingjia had borrowed books related to their work, Fu Liangtao became interested and asked one after another, "What kind of books did she borrow?" Is the content related to Trojan horses?"

Pang Jitong pulled out an A4-sized piece of printer paper, which listed Xu Jingjia's borrowing and returning records for the last two years, in which Pang Jitong used a fluorescent marker pen to indicate the names of books related to hacking techniques and electronic evidence forensics.

I only heard Pang Jitong continue: "I took a look at the trial versions of these books on the Internet. The books Xu Jingjia borrowed are only introductory, and most of the content is only a summary, which can only provide her with common knowledge in the industry and provide her with a direction to study. However, in practice, the content of these books is far from specialized enough."

Fu Liangtao quickly skimmed through Xu Jingjia's borrowing and returning records. Theoretically, if you want to learn computer-related skills, most people will focus on borrowing the latest published books to ensure that the skills they are learning are not outdated. However, Fu Liangtao found that the books borrowed by Xu Jingjia were old and new, and the oldest one was published almost 20 years ago.

Fu Liangtao then typed the title of one of the books in the borrowing and returning record into the tablet, found the table of contents of the book, and said to Pang Jitong, "Look at the contents of this book."

"The bibliography chosen by Xu Jingjia is not all chaotic. Although published in 2011, this book "Electronic Data Evidence and Computer Crime" is an old book, but it is a good primer. I know that eDiscovery technology is changing so fast that many people think old books are useless, but this one is not comparable to many new books.

This book may not be useful for those who already have a basic knowledge of e-forensics, but for complete novices, this book is not only comprehensive, but also has a detailed list of reference books and e-learning materials for readers to further explore the category under each forensic category.

The content of this book may be outdated, but the learning materials listed in the book are constantly updated online, and if Xu Jingjia reads it carefully, it will not be difficult for her to learn the skills and knowledge she needs to learn from it. As far as I know, many tertiary institutions in overseas countries still use this book as a primer for electronic data forensics-related subjects."

"How do you know so well?" Pang Jitong asked.

Fu Liangtao's seriousness suddenly broke down, and said with a smile: "Because of this book, I also have one at home."

Remembering the book's publication date in 2011, Pang Jitong asked, "Could it be that your decision to transfer to TCD was not impromptu?"

Fu Liangtao didn't seem to hear Pang Jitong's question, so he only sighed to himself: "In this way, the evidence is enough."