Adding a password to a piece of text is a relatively simple encryption method.
The more advanced encryption methods abroad have used cipher machines, and the letters are changed to replace the original meaning.
To give a simple example, A may be S, and S may be D. This requires a professional encryption machine.
Moreover, for thirty days in a month, a different decryption table is used every day, which means that the encryption method is different every day.
Obviously, the four pieces of paper currently placed on Yu Jingque's desk have not been encrypted to this extent, and can only be regarded as the simplest encryption.
It's nothing more than rules.
To give another simple example, there are things like acrostic poems and acrostic poems.
A little more complicated, that is, the first character on the first line, the second character on the second line, the third character on the third line...
But even if it is simple, it will not be so simple.
What Yu Jingque wants to say is that the principles are the same, the principles of encryption are the same, the question is what rules are used.
Encrypt even numbers, encrypt odd numbers, or decrease in order...
Yu Jingque had no idea what exactly was used here.
His eyes darkened, and it would be difficult to decipher it.
Yu Jingque suddenly remembered that Ji Youning taught mathematics, would he be very knowledgeable about these things?
After thinking about it, even if Ji Youning was really knowledgeable, Yu Jingque would not dare to show it to Ji Youning, let alone let Ji Youning solve the mystery.
If there was only one piece of paper, Yu Jingque could still try to see if he could be a blind cat and a dead mouse, but there were four of them here.
Intuitive?
Yu Jingque heard Chen Xiqiao say that in this industry, evidence is very important, but sometimes, intuition is equally important.
Four pieces of paper, choose one from four?
Yu Jingque shook his head. He believed that he did not have a gambler's mentality and the probability of choosing one of the four was not high.
The probability of choosing the right one is 25%, but the probability of choosing the wrong one is as high as 75%.
This is an unequal choice, and it is difficult for Yu Jingque to make up his mind and make a decision.
No, wait...
Yu Jingque suddenly had an idea. He came out of the study and ran to the room.
"Are you done?" When Ji Youning saw Yu Jingque coming in, he thought he was done.
While Yu Jingque was getting dressed, he said, "You rest first, I want to go out."
Without waiting for Ji Youning to ask, Yu Jingque left the room and put on his coat downstairs.
He shouted to Yu Mosheng: "Let me drive the car."
The key was taken away directly by Yu Jingque, and Yu Mosheng hadn't even come to remember to speak.
As he drove out, Yu Jingque knew in his mind how he should judge.
The leaflets posted by Zhou Jiezhi have a purpose.
He won't post it everywhere, he will only post it on the designated bulletin board.
But other flyers have no purpose. They are to let more people know, so they are posted everywhere.
What Yu Jingque needs to do now is to drive to nearby bulletin boards, street light poles, and walls to search.
If you find the same one as those on the four flyers in your home, you can exclude it.
After driving over, Yu Jingque took the lead in looking at nearby light poles and walls.
If Yu Jingque went directly to other bulletin boards, those flyers would also be covered underneath, and Yu Jingque would still need to peel them off, which would be too troublesome.
Yu Jingque ran over from street lamp to street lamp.
With a happy smile on his face, he found one and eliminated it directly.
Then I also found one on the wall and eliminated it.
Along the way I found another bulletin board, and sure enough it was covered with new flyers.
Yu Jingque was not in a hurry to peel them off. He continued to search on the wall and found another one.
All three were found, and only one was not repeated, which is very illustrative of the problem.
Run back to the car and drive home.
Throw the key to Yu Mosheng and run up to the second floor.
Use the key to open the study room and lock the door after entering.
Take three pieces of paper from the table and throw them away.
Use a lighter to burn all the waste paper except the last one.
A missing person notice.
There are a lot of missing person notices these days.
In troubled times, there are many places of displacement and separation of flesh and blood.
Missing person notices are not unusual and will not attract anyone's attention.
However, there is no contact number on this missing person notice, only a contact address.
Yu Jingque didn't bother to check, either this place didn't exist, or this place had nothing to do with Zhou Jiezhi.
The missing person notice contained a lot of text, but no photos.
Use words to describe appearance, this paragraph is very long.
There are also things like the time and place of getting lost and so on.
In short, it is an article that contains a lot of words and is densely packed.
But Yu Jingque thinks that the really useful things here may not exceed ten words.
But which ten words are they?
Now comes the hardest part.
Peeling off these papers can only be regarded as the first step. Just be patient and there will be no problem.
It is not difficult to find this missing person notice. It can be done with a little thinking.
The last step is to extract the most critical information from this missing person notice, which is the most difficult step.
Yu Jingque has trained in both encryption and decryption.
In fact, it is just to put money on their faces. The things they trained are nothing more than children's playing house in the eyes of professional communications personnel.
Indeed, what Yu Jingque and the others played before could only be regarded as a decryption game.
Since I can only decrypt games, I can only complete the missing person notice in my hand as a decryption game.
Zhou Jiezhi's encryption method is not too difficult because conditions do not allow him to encrypt passwords that are too difficult.
And if it was difficult, Zhou Jiezhi would not attack Huang Tian. He should have enough confidence that Huang Tian could not tell.
Zhou Jiezhi did not calm down, indicating that the password was actually not as difficult as imagined.
It’s difficult for those who don’t know how to do it, but it’s not difficult for those who can do it.
People who don’t understand it think it’s like a heavenly book, but those who understand it think it’s too simple and they might not be able to hide it from everyone.
Yu Jingque read the missing person notice over and over again, and he could almost recite it by heart.
During the training at the police academy, the instructor told them that if they find a secret message or suspect it is a secret message.
The first key information to look for is the time, address, and name.
This is the lowest level and can be seen at a glance.
It's a little more difficult, find the numbers in it, the uppercase numbers.
Such as Monday, such as Laoba snatching cigarettes, such as three, three, two and other idioms.
One, eight, three three, two two may be the hidden time information.
During Yu Jingque's training, that's pretty much all he learned.
But would Zhou Jiezhi use such a simple method?
Probably not. After all, it was too simple. Yu Jingque did not use this method to find the logic in the missing person notice.
Time passed little by little, and at eleven o'clock at night, Yu Jingque still had no clue.
I have read the missing person notice hundreds of times, but I am still confused.
The anti-Japanese elements were careful to prevent Manchukuo and the Japanese from discovering it, which was fully reflected in this.
But now Yu Jingque is suffering and has no clue at all.
It sounds normal. If you don’t know the password and don’t know the rules, if you want to unlock the password, it will be really difficult.
There may be millions of combinations and changes here. If you let Yu Jingque try them one by one, Yu Jingque might die of old age and not be able to find the answer.
what to do?
It's not that Yu Jingque is incompetent, but that he has expertise in the field. Yu Jingque has only had superficial exposure to knowledge such as passwords. He is obviously still a layman.