The Rise of the Empire

"Dear Your Majesty the Emperor, you seem to be tired of the stylized politics and various activities. In this case, how about we do something more meaningful? A game that tests intelligence and rational analysis. As far as I am concerned , I am not at ease about the intelligence security of the central government of Prussia and Germany. I once organized an intelligence analysis team in my spare time. They used the normal distribution and the idea of ​​solving matrix equations to decipher the Bavarian telegraph system. The result It was beyond my expectation, and later, one of the experts told me privately that there are all kinds of loopholes in the encryption system of the German, French or British. As long as there is sufficient financial and material support , all passwords are worthless in front of them. This makes me very disturbed, so I decided to develop a new encryption method to solve this problem, and now that this system has been developed, I want to try it Security," Ruprecht wrote to the Kaiser.

Ruprecht **** first established contact with the Kaiser through pen pals, but now, although there is a more direct way, the two are still willing to communicate in words when they seem to have nothing to do. And some content that is inconvenient to be transmitted by relay or telephone is passed to each other through letters one after another.

"Prussia's intelligence encryption is absolutely safe, there can be no problems, but if someone wants to try it, I am willing to give you a chance, but it needs a lottery. If possible, I would also like to see it What is your so-called new encryption method?" The Kaiser wrote in the letter with some disapproval, although he did not believe what the **** said, but this is indeed a very interesting game. "

"I will use the code of the Prussian military to transmit part of the information. I will send three to seven intelligence letters with special markings and special meanings every week. How?" As the emperor of a country, this amount of money is nothing, it's all for fun, the Kaiser is still very relieved about his intelligence system, and he also wants to see, in this field, the future What new tricks can the king of Bavaria come up with!

"As you wish, His Majesty the Kaiser, if you feel that it is difficult for one person to bear this heavy bet, you can invite your ministers to play this game together, I think we will benefit a lot from each other , I got a lot of marks, and you foresaw the danger." His Royal Highness wrote quite confidently in his reply.

"Crazy guy! I will definitely make you pay for your arrogance! If you are willing to terminate this game, you only need to hand over 1 million marks to me. How?" The Kaiser's anger was reflected in the letter Incisively and vividly, because he felt that the other party was insulting him, no, he was insulting the IQ of the Kingdom of Prussia!

"Tell Moltke, let him use our latest ADFGV cipher to encrypt, and then send the ciphertext to that arrogant Bavarian prince. As for the content? Just copy the order we just gave Krupp." The Kaiser commanded.

So on the eve of Christmas in 1902, a new game between the Kaiser and Ruprecht began. At this time, the German Army had begun to gradually update the password, using this method, which was called ADFGV by insiders. The new frame password is transmitted. After receiving the Kaiser's order, Little Mao Qi also became interested. He also wanted to know whether the so-called undecipherable code that the German Army had just created was really as good as the code inventor said.

Soon, when this code officially began to be used within the German military,

The game between the two sides has officially begun! The first week's three telegrams were sent, and nothing was heard from them. In the same way, Bavaria also sent three telegrams, which German experts also could not decipher. However, in this contest, no one cared too much about the gains and losses of the week. The willingness is very simple. When a telegram system appears, it will be absolutely impossible to decipher in a short time. The key to deciphering telegrams lies in repetition and correspondence with facts. . The former is to explore the relationship and encryption method between ciphertext and plaintext, while the latter is to verify the correspondence between ciphertext and facts.

Not to mention a week, for a whole month, neither side could decipher the other's telegram. Because both sides know nothing about each other's algorithms, it is also a very troublesome thing to filter intelligence from corresponding events. Although it is very calm on the surface, in fact, under the calm appearance, the two sides have gradually changed. The Prussian side is still collecting a lot of Bavarian army dynamics to correspond to the contents of the telegram. And **** has already begun to crack the password encryption method.

"Dear **** Your Highness, I take back what I said before. The Prussian side is not all rubbish in terms of encryption mathematics. This time, the frame cipher they came up with is very interesting, at least using the classical one. It is very difficult to guess this information based on normal distribution and statistical principles, because they introduced a password to determine the position of the frame during the deciphering process. It's not easy." In the **** office, Bavaria's chief intelligence officer Arthur Scherbius and his assistant Richard Ritter were reporting to the prince on his work during this period.

The so-called classical encryption is actually to directly replace the letters in the plaintext with pre-agreed seemingly irregular codes. There may be multiple replacements in the middle to increase the difficulty of cracking. But because it is a simple one-to-one correspondence, no matter how many times you want to replace it, you can find out the correspondence relatively easily after comparing with the facts, because no matter how you replace it, a piece of text in the ciphertext can only correspond to the corresponding plaintext , just guess directly when necessary.

For example, you received an intelligence message, which was sent to a certain war zone, but the enemy in a certain war zone suddenly launched an attack the next day. Well, if you are sure that this information has something to do with this attack, then you can directly find the corresponding relationship. The location, time and process of the attack will definitely be mentioned in this information, right? Then just look for it directly. It doesn’t matter if you can’t find it once, just accumulate some materials and continue to look for it. With so many telegrams on the battlefield, the corresponding relationship can always be found quickly. This is known as classical encryption. Of course, this type of encryption is outdated. Not even the Prussian military ....

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