The codebook password can be said to be the simplest form of cryptography.
As the name suggests, this form of password requires the two parties who send and receive the password to agree on a book with text as the code book that supports the basis of the password. The numbers in the password string are used to refer to the page number of the book and which page is on each page. Character.
Liang Yuanque asked Teacher Tan for a pencil and divided the series of numbers written by Lou Yating.
Based on large intervals, a total of four groups of numbers can be divided. There are small intervals between these four groups of numbers. According to the small intervals, each group of numbers can be divided into three parts again. According to his usual experience, they can be regarded as page numbers. , number of lines and number of words.
So, now that the main body of the password has been analyzed, the most important question comes. What is the most important password book for running this set of passwords?
Liang Yuanque briefly told Teacher Tan his analysis of this string of digital codes, trying to make Teacher Tan think about what Lou Yating would use as a codebook.
Teacher Tan had never been exposed to this before, so she was naturally confused at this time, "Well, Teacher Xiaozhuang, I really can't think of it, but I thought that Yating usually has a good relationship with a student named Tang Chujie in our class. Maybe he Will you know Yating better?"
Liang Yuanque recalled Tang Chujie and felt that he had already told all the stories between himself and Lou Yating. Since they did not mention that they usually communicated with each other in passwords, maybe Lou Yating's password was not related to Tang Chujie's. Used during the period?
If Tang Chujie could understand this password, Lou Yating should have left the password to him, but now she left the password to Teacher Tan.
From Zhuang Youjie's introduction, Liang Yuanque learned that Teacher Tan is a gentle-tempered teacher who treats students very seriously, so basically the students in this grade respect her, especially many girls, who are very close to her. Very trusting.
Lou Yating left a letter to Teacher Tan and a password just in case, which proved that she trusted this kind teacher and was sure that only Teacher Tan could solve the password.
Only Teacher Tan can...or is it very closely related to Teacher Tan, right?
An idea flashed in Liang Yuanque's mind, and he thought of Zhuang Youjie, a fool. He introduced him to him for a long time what kind of person Teacher Tan was, but he didn't tell him one key thing, "Teacher Tan, please ask, what subject do you teach?"
Teacher Tan was stunned for a moment, maybe thinking that Liang Yuanque had known about it for a long time, "Me? I'm a history teacher."
They should be inseparable. Liang Yuanque clapped his hands and said, "Teacher Tan, please give me a textbook on the subject you are using now."
Teacher Tan returned to his desk and pulled out a book from the pile, "Here, this is it."
Liang Yuanque took it and turned over it one by one according to the numbers marked on the password.
The fifth word in the fifteenth line of page eight, the second word in the third line of page forty-five, the tenth word in the ninth line of page fifty-seven, and the twelfth word in the seventh line of page sixty.
A total of four words were found, and when combined they are:
"Save me Changhong".
Changhong?
Liang Yuanque wrote these words in his notebook and checked it. "Save me" was obviously a distress signal, but what did Changhong mean? Is it a personal name?
Liang Yuanque recalled that there seemed to be no one named "Changhong" who had appeared in the case so far, and Teacher Tan was not named Tan Changhong either.
"Teacher Tan, is there a student named Changhong in your class, or do you know that Lou Yating has a friend with this name?" He couldn't figure it out, so he could only ask Teacher Tan.
Teacher Tan thought for a while, "There is a student named Changhong in our class, but the two sounds are not the same, and that child is not familiar with Yating."
Oh my, Liang Yuanque sighed deeply, what's going on with this little girl Lou Yating? Do you still want to be saved? I don't even know how to write a distress message carefully. If you can find her intact, you must. Teach her the correct way to ask for help!
Teacher Tan looked at the distress message and thought for a moment, "Teacher Xiaozhuang, could it be that Changhong refers to Changhong Street?"
Changhong Street? Liang Yuanque narrowed his eyes. He had seen the map here before coming here. Although he did not completely remember all the routes, he still used his extraordinary memory to remember the names of all the streets here. There is no Changhong here. Street.
Seeing his confused expression, Teacher Tan quickly explained, "Ah, that's the case. A section of Changping Road here used to be called Changhong Street. During the city's restructuring in the early years of the Republic of China, many small streets were After the merger, Changhong Street merged with other streets to form Changping Road, but many locals are still used to calling them by their previous names, but the names of these streets will not appear on the map."
It turns out that this is the case. No wonder Liang Yuanque heard passers-by jokingly saying that this was a place where you could get lost even with a map.
Liang Yuanque had no impression of Changhong Street, but when Teacher Tan mentioned Changping Road, he gradually became familiar with it.
Lou Yuxin provided him that the so-called cousin's family lived on Changping Road.
Since the Lou family has never been here, Lou Yuxin is relatively a foreigner, so he only knows Changping Road that appears in this mailing address, and does not know Changhong Street, and Lou Yating is already here. I have lived here for two years, so I am familiar with this place name that only appears in the local population.
Lou Yating left this place name in the password. Does it mean that she is controlled by her cousin's family?
Ever since he couldn't find his cousin, Liang Yuanque felt that this family was very suspicious. It seemed that it was necessary to go back to Changping Road, oh no, Changhong Street.
After getting Teacher Tan's permission, Liang Yuanque took Lou Yating's notebook.
After this notebook was reported to the school, Teacher Tan mentioned it to the detectives at the police station. Unfortunately, no one in the world regarded this as an important piece of evidence, so naturally they didn't find any way to it.
This was lucky, otherwise if the police station had taken away the notebook, Liang Yuanque might not have had the chance to crack the distress code.
After all, this is not Liucheng, and no one here has the dignity to make the detectives in the police station obey him.
Thinking of this, he still missed Inspector Chang a little, and he didn't know if he was successfully promoted.
Liang Yuanque was thinking as he hurried on. He was very fast on his feet and arrived at Changhong Street not long after leaving school.
According to the address, he knocked on the door of his "cousin's" house again. The middle-aged woman who opened the door was still the same middle-aged woman as before. When he saw that it was him again, she quickly waved her hands very irritably.
"Oh, I told you. Their family has moved away a long time ago. If you want to cause trouble again, I will report it to the police station!"
With that said, she was about to close the door, but was stopped by Liang Yuanque with quick eyes and hands.
"Auntie, if I guess correctly, you are actually the cousin of the Lou family!"
