When Gou Bin came to the sonar room, he was a little surprised to find that there was a black box-like thing in the sonar room, to be exact, it was the Nazi radio cipher machine, as for how Gou Bin knew, the swastika under the cipher machine was too eye-catching, as long as it was not a fool, it could almost be recognized, this is a special cipher machine for wolves,

It's just that this wolf's special radio cipher machine, how did it come here, radio communication is the most important means for submarines to obtain information in sea activities, as well as to report the situation, and the "Enigma" cipher machine is related to the entire radio communication security equipment, its importance can be imagined, such a confidential thing, how can Durex have,

Tick Tick Tick... Enigma cipher machine seemed to receive some signal, the keyboard-like box was beating on the light, seeing this Gou Bin couldn't help but be surprised, what does this mean, Mei Du spread out a notepad with a pen in his hand, and memorized the letters of the light to prepare for the next step to decipher the secret, that is, to decipher the information he received just now,

When Durex confirmed that the other party had not sent the password, he immediately opened a thick German translated book and tried to make do with the translation, Durex waited for Plum to start translating, frowned, took out a tomato from the pocket of his military uniform, and took a sour bite to anesthetize his nerves, to be precise, some sleepy and sleepy nerves,

When Sean and the others came, they all gathered outside the door of the sonar room, the location of the sonar room was limited and there were not so many people squeezed in, Gou Bin and Durex and Mei Du were already crowded enough, if they were squeezing in, I am afraid it would be even more crowded, of course, provided that they had the courage to squeeze in, the crazy Gou Bin would kick them out,

A few minutes passed, Gou Bin didn't say anything to interrupt Mei Du's decipherment, and finally Mei Du wiped the sweat on his face with one hand and said: "Okay, captain, these are the codes, through decipherment, it shows that there is a Nazi submarine in the sea near us, it seems that it has been hit hard and cannot move, and it means to send a signal to request support or rescue, the approximate location, as if it is docked at latitude and longitude..."

Durex sucked the sweet and sour juice of the tomatoes, keeping his mind clear at all times, and after staring at Medo suspiciously for a moment, he frowned and said: "Ask for help, ask for what help, this is the Pacific Ocean, where did the Nazi cipher machine come from, be sure about the news, don't fall into any trap." ”

"I'm U-77, request to receive information, destroy me." Mei Du said something that made Gou Bin a little puzzled, what kind of messy information, although it was a bit messy, but Gou Bin seemed to be beating in his heart, and there seemed to be a voice in his head calling him to go and find out.

"What is this?" Although Gou Bin knew that this black box-like thing was a cipher machine, he didn't know what it was called, but he just felt that its bulky appearance was a bit like an old antique computer, if it was multiple mice and monitors or something, it would be an old-fashioned computer, suppressing the impulse in his heart, Gou Bin opened his mouth and asked Durex,

Durex swallowed the remaining half of the tomatoes in one gulp, licked his lips and said: "The coded telegraph machine specially equipped with the Nazi U-boat, also known as the Sherlock Holmes cipher machine, was borrowed from the British side, and it was used to communicate with the launch ship Dönitz this time, and the cunning Dönitz will use the Sherlock Holmes cipher machine to contact me..."

Gou Bin heard Durex's cookie-cutter nonsense, raised his hand in surrender with some headache and said: "Okay, stop, stop, I just want to know, how it works, other news that has nothing to do with toothache, has nothing to do with me, how do you know how it works, I won't send it out now." ”

Mei Du quickly blocked Gou Bin's curiosity with his hand, and explained with a sweaty face: "Okay, sir, this is by Conan, Doyle in his famous Sherlock Holmes detective "Dancing Villain", he described in great detail the frequency of Sherlock Holmes' use, and the statistical method to decipher the dancing humanoid code, that is, the process of simply replacing the password. ”

"Can you be more detailed, I don't understand this deeply." Gou Bin slapped his forehead with a headache under Mei Du's explanation, and found that there were familiar people who would use the cipher machine, of course Gou Bin had to ask first, maybe he would use it one day in the future, Gou Bin, who had suffered from illiteracy, knew that no culture was terrible,

Medo turned his head and looked at Durex, and after receiving Durex's nod of acquiescence, he opened his mouth and continued to explain: "Okay, the reason why it's called a cipher machine is because it can turn, that's the key, when you press a letter key on the keyboard, the corresponding encrypted letter is displayed on the monitor by the light bulb flashing, and the rotor automatically rotates the position of a letter." ”

Gou Bin listened a little ignorant, but he barely wrote it down, Durex looked at Gou Bin a little strangely, and he didn't know what he was doing when he learned the cipher machine, but Gou Bin didn't say that he didn't want to ask much, and Durex suddenly remembered something, and it seemed that Gou Bin had mentioned to himself that he had a Nazi U-boat,

When Gou Bin was ignorant, Mei Du said what he knew: "For example, when you type A for the first time, the light bulb B turns on, and the rotor rotates one square, the password corresponding to each letter changes, and the second time you type A, the letter corresponding to it may become C; Similarly, when you type A for the third time, it may be that the light bulb D is on. ”

Mei Du didn't care how much Gou Bin could remember, and Kuakwaki continued: "This is the key to the difficulty of deciphering "Enigma", this is not a simple replacement cipher, the same letter can be replaced by different letters in different positions in the plaintext, and the same letter in different positions in the ciphertext can represent different letters in the plaintext, the letter frequency analysis method is useless here, this encryption method is called "compound replacement cipher" in cryptography. ”

Through Mei Du's explanation, Gou Bin has some understanding of the Enigma telegraph, if you type 26 letters in a row, the rotor will turn around and return to the original direction, then the code will be repeated from the beginning, and in the encryption process, the phenomenon of repetition is the biggest flaw, because this can enable the person who deciphers the code to find the law.

So the person who invented "Enigma" added a rotor, when the first rotor rotated a full circle, it had a gear on it to dial the second rotor, so that its direction rotated the position of a letter, which greatly increased the difficulty of cracking, otherwise Britain would not have suffered heavy losses, and finally took the risk to grab a cipher machine and go back to study.

It's just that this cipher machine has become a bit complicated again, assuming that the first rotor has made a full turn, and the D bulb on the display lights up when the A button is pressed; When the A key is released, the gear on the first rotor also drives the second rotor to rotate one square at the same time, so when you type A for the second time, the encrypted letter may be E; When you release the key A again, only the first rotor rotates, so when you type A for the third time, the corresponding letter may be F.

Sean stood outside the sonar room, and after listening to Medo's explanation, he sighed and said: "It's really complicated enough, these Nazis are really flexible enough to get some such a headache cipher machine, Cruz, look at your current expression, are you going to find this person who sent the cipher telegram next?" ”

After following Gou Bin for so long, Sean already knew Gou Bin's inner thoughts, because Gou Bin at this time had already written his thoughts on his face, Snoopy and Jimmy They also saw through Gou Bin's thoughts, Gou Bin's frowning and contemplative actions meant that he was interested in the person who sent the coded telegram, and his expression had betrayed him,

It's no wonder that Gou Bin is curious, this is the Pacific Ocean and the United States, there are Nazi submarines appearing, it is difficult for Gou Bin not to be curious, Dönitz's launch ship is simply impossible, there is still a day away from his out-of-control launch ship, and this is obviously a shortwave launch, Medo has explained it very clearly,

Gou Bin nodded under the gaze of Sean and said with a somewhat hesitant face: "Well, that's right, I'm curious about who and who sent such a strange coded telegram, and I seem to have sensed something in my heart, and there is a voice in my heart calling me to go over and see what is going on, if I don't go, I will regret something." ”

Durex heard Gou Bin's words, and said with a hesitant face: "Cruz, I don't have to remind you of a word, we don't have so much time to consume, if we arrive late, there is a possibility that the mission will fail, or the Nazis will arrive before us, then it will be a big trouble, my submarine has no way to dive to a depth of 10 meters, and there is a problem with the sealing..."

Gou Bin stretched out his hand to interrupt Durex's words, looked directly at Durex and said undoubtedly: "This is not the point, Durex, I want to know one thing, if we waste an hour or two, can we rush to it, do everything possible, please forgive me for my selfishness, this person who sent the code telegram is a bit important to me, because I trust my intuition." ”

Gou Bin has always respected and valued his intuition, because now Gou Bin always has a very strong message in his mind, I want to find the person who sent the telegram, very strong and at the same time interfered with Gou Bin, Gou Bin, who has always attached great importance to his intuition, has to be selfish at the moment, Gou Bin doesn't want to regret it for the rest of his life because he neglected to miss something,

"You're sure you want to do it." Durex glanced at Gou Bin, there was no fluctuation in his flat tone, his eyes stared at Gou Bin, reminding Gou Bin that he was in danger, they still had more important tasks to perform, of course, Durex also had his own ideas, he just wanted to confirm Gou Bin's opinion,

Gou Bin looked around at the same Sean and a few of them, and when Sean and a few of them looked over from Gou Bin, they nodded in support at the same time, Gou Bin sighed and said: "Yes, that's right, I'm sure, captain, carry out the order, I don't want to let myself miss anything, I hope you can forgive me for my selfishness." ”

Durex looked at Gou Bin's unwavering eyes for a long time, and then said with an expression of "I am a loser": "Okay, Meidu, turn on the sonar to find out the specific location of the submarine that sent the telegram, first mate, the submarine slows down, and the torpedo man immediately returns to his post to report the safety of the torpedo at any time..."