"I don't know what kind of person you are, and of course I can't just show you my precious collection of books! You have to prove that you are qualified to read our ancient books. Pen Fun Pavilion www.biquge.info"

“.…..”

He Xi remembered that if this task in Wonderland was stuck, he went to find Yi Lande, and he went with the mentality of giving it a try...

"How? Did you find it? Not yet... Then please! ”

……

Just when He Xi was at a loss and was about to give up the task and work on some other projects, Shangguan Lumen actually came unexpectedly and met He Xi at the fountain in Jifen.

"Yo, Lumens, what a coincidence!"

"Hmm."

"What are you up to?"

"Mission."

"Oh."

"What about you?"

"It's a stuck mission."

"Let's talk?"

"Okay!"

Perhaps it was He Xi who helped him solve the key task, Shangguan Lumen obviously showed enthusiasm for He Xi, and even took the initiative to chat with He Xi, He Xi happened to be confused about this task, and took this opportunity to tell Shangguan Lumen all his thoughts. The strange thing is that after listening to He Xi's complaints, Shangguan Luming was unexpectedly silent.

"Lumens, what's wrong?"

"Your mission... It may not be as simple as it seems..."After a long pause, he finally spoke.

"What do you mean?" He Xi was puzzled.

"Look at this."

He Xi clicked on the item "Bruce Family Letters" posted by Shangguan Lumen on the team channel.

Bruce Family Letters

My Most Loyal Butler Sebastian:

I must admit that the weather in the Republic of Shofaz is indeed worse than I imagined, and the yellow sand and dust in the sky make it extremely difficult for me to adapt, and at this moment I miss the days when you were by my side, but this is not realistic, you and I know it very well. With three months to go back to the kingdom, I think I can only endure a little longer.

I think you have a point in discussing the scope of your stewardship duties before coming to the Republic, but I prefer a more gentle approach, and of course I am open to the exchange of ideas, and I hope that you will not upset your heart, and that you will support my views. We'll talk about that when I get back, what do you think?

By the way, I sent back a batch of my personal belongings, all of which I don't need here, and I made a list on the back of the letter and kept them for me, I don't want to come back and find them missing, okay?

Your host and friend, Flender the Bruce

“… I don't know what the meaning of the so-called faith is? He Xizhang was confused.

"Look at the second paragraph."

……

Hey? Hey!

"This?! This?! This?! ”

"Attack less, you also found out, right? The second paragraph of this letter has the same strange situation as you. You see, 'I think what you said makes sense' is the beginning, and 'what do you think' be the end, with a message in between. If I'm not mistaken, this is supposed to be the connector code used for information transmission. When you told me that the Monster Guild knocked on the door according to the laws of the Morse code, it made me even more convinced of this view. ”

"! Makes sense! Otherwise, they wouldn't have a reason to talk nonsense with me for no reason, and if they say the same thing, they must be in..."

"It's testing you to see if you can match their code words, if you match, it means that it's your own person, if it's not, it means it's just an ordinary passerby."

"Ahh That means, I failed both times? So they treated me as a passerby and fooled me casually? ”

"I'm not sure," Shangguan Lumen shook his head, "first we have to figure out the meaning of their code words, then the meaning of their intelligence, and finally find a way to use reverse deduction to talk to them." ”

"Well, do you have any ideas?"

"Not for the time being, I consulted in the gang and thief group in Monroc, and the incision they use (code words in gangs or some industries) is completely different from this one, I can only guess that this is a cryptographic code word, if there is no code comparison table and rule description, it is a fool's dream to decipher it."

“.…..”

"Ever heard of Innigma?"

"What? Nima? He Xi shook his head.

"Innigma. Germany's ENIGMA (or Enigma, Enigma, meaning dumb riddle) cipher machine, is the German inventor Arthur? Shelbius's 1918 invention of a machine capable of automatic encoding, was transformed into a military cipher machine by the German military during World War II. To put it simply, Innigma is an ordinary typing keyboard plus a letter display light plate that turns into a password, and the most critical part is a few turntables similar to those on the safe, when used, as long as each turntable rotates a different number of turns, it can generate different electronic pulses, and the electronic pulses automatically convert the text typed on the ordinary keyboard into passwords. If there is no encoding program for this encryption method, that is, as long as you don't know the number of turns of the turntable agreed by the sender and the receiver, then even if you get the Enigma cipher machine, it can't be deciphered, and the number of turns can be adjusted at any time, so the secrecy is extremely strong, and it is simply impossible to decipher. ”

"I understand, you mean that this encrypted code word in our hands is also similar to Innigma and cannot be deciphered?"

"Innigma was later deciphered."

“……”

On September 4, 1939, Turing, Britain's best mathematician, was selected by the British authorities to study how to decipher Innigma, and he designed a decipherment machine, but if he had no clue to decipher it from scratch, it would be equivalent to testing the 159 billion possibilities corresponding to each letter, which was too much calculation for the mechanical level at that time. Until one day, Turing accidentally made a major discovery. ”

"What's the big discovery?"

One day, he chatted with a British correspondent, and the correspondent joked with Turing, saying that he worked with the Germans every day, Turing was surprised and asked what was the reason for this, and the correspondent explained that his daily job was to intercept intelligence from a specific German radio tower, and the telegraph operator of the radio tower opposite was also a correspondent, and he was equivalent to a one-to-one correspondence with the Germans opposite, and each person felt different when sending telegrams, and over time he knew the rhythm of the other party's telegrams, It was a strange intimacy, and it seemed that he knew each other very well. Turing said, "Do you have feelings for each other?" The communicator replied oh no, unfortunately, the other party already has a girlfriend. Turing was surprised, why did you know that the German had a girlfriend? Obviously the other party's telegram is encrypted with Innigma, right? The correspondent said, I guess, because every time he sends a message, it starts with the same five letters, C-I-l-l-y, so Cilly must be the girl he likes. ”

"It can't be a girl's name, this stupid correspondent."