"But this method is not very safe, although 17576 is a lot, but if the other party can get a cipher machine, and use the enumeration method to decipher, adjust the rotor in a certain position, and then enter the ciphertext, to see if the text makes sense. Pen, fun, pavilion www. biquge。 info This can still be cracked theoretically, and if the other party has multiple such machines, the cracking efficiency will be greatly accelerated. Schlieffen offered his opinion.

"Isn't that smart? Considering the problem of the other side obtaining passwords or cipher devices, how could it be that in World War I, the Russians obtained the code book of the German High Seas Fleet from the beginning, and in the end the German Navy did not know to change or renew a set of passwords? The prince complained frantically in his heart. It seems that there is still a big gap between understanding and doing!

"If we add a rotor, we can solve this problem, but what we need is a more convenient decoding equipment, not a large and expensive machine, which must be moderately expensive in terms of cost and volume." Schlieffen continued.

"What you said makes a lot of sense, we have experimented that if the other party uses our machine to crack it with enumeration, it will take about two weeks for griffons to crack 24 hours a day, so for this reason, we have also set up two other secrecy measures to increase the difficulty of cracking, for example, these three rotors are detachable, and their positions and numbers can be adjusted, which makes it 6 times more difficult to crack! And that's not all, we've also added adjustable wires inside the machine, which can connect the letters, for example, we connect A and D, and when we type A, it actually becomes D before it enters the rotor, and then it goes through the rotor encryption, and vice versa, when we type D, it first goes through the encryption once to become A, and then changes with the rotor. After these two steps, the encrypted ciphertext is almost impossible to crack by brute force! Arthur said with a smile.

The position change of the three rotors has a limited increase in the difficulty of cracking the code, but the change between the 26 letters definitely increases the difficulty of cracking to a terrifying level! Just add a few wires and you can increase the number of cracker experiments to more than 100 million! Coupled with the fact that there are no repetitions to speak of, such a code is really theoretically unbreakable, at least in the eyes of the Prussians! "We have finally settled the issue of telegraph secrecy once and for all." A Prussian officer exclaimed.

"No, this encryption can be cracked! Because our enemies may obtain this cipher machine, for example, from our internal traitors, for example, from the battlefield, as long as they get a cipher machine, then they can copy, then our rotor encryption becomes useless, and as long as they can get the key of the day, know the location of the rotor, then it is possible to crack the content, although the replacement of the letters makes it difficult to decipher theoretically, but they can still guess, in time can not completely crack the connection, it is still possible to get approximate information! Just when the Prussian military was full of praise for this cipher machine, Ruprecht **** said a word that shocked them even more!

"It is true that the key is changed every day, but the order of the wiring and rotor arrangement is agreed in advance, and the only thing that can really be changed randomly is the corresponding order of the rotor! This is the six letters before each report, of which the first letter and the fourth letter are replaced by a clear text, and if the exquisite mathematician can obtain this cipher machine, and use this substitution, then there will be a chance to crack, and finally in the eyes of these people, the key of the day has become a circle of different lengths, and this circle is determined by the position of the rotor and the initial direction, and the most common way to connect is excluded! ”

"That's right, although there are still many cases of this experiment, but after all, it makes the whole intelligence possible. If the other party has copied a lot of cipher machines, then they still have the possibility of cracking it. Arthur also agreed, after all, the traverser has a wealth of experience in later generations, and people know how this dumb puzzle machine was cracked in history!" In order to prevent the other party from using the same means to encrypt, we also designed a mechanical decoder, as long as there is a similar cipher machine, and with this decoder, we can experiment with the key of the three-rotor cipher machine within 2 hours! So, I don't think there's a code in this world that can't be cracked! ”

The cracking machine that Arthur is talking about is the "bomb" machine used by the Poles when they began to crack the dumb puzzle machine in history, in fact, the Enig cipher machine was cracked before the outbreak of World War II, because of the small number of rotors and the habits of the transmitter itself. Although the "bomb" machine provides some ideas, it is still a long way from actually cracking more rotor machines and invertable cipher machines, and the later Allied crackers in history also relied on guessing and even acting to deceive to obtain information to analyze the code. The German Navy's cipher machine cracking time is even later, and it can only be effectively cracked after obtaining a completed naval cipher machine.

Therefore, according to the words of the prince, the Enig cipher machine can be cracked, but it requires a lot of manpower and material resources, after all, you know that the method is still quite far from cracking, at least in the environment of World War 1, if you are careful, the Enig cipher machine is still almost unsolvable, because the Polish mathematicians who discovered the Enig cipher machine have not yet been born, and even before the end of World War 1, they are still Germans....... And if the prince can wear a crown on this plane, Poland must not exist, so in the next 20 years, the military multirotor Ennig cipher machine will still be safe!

"In other words, we have a relatively reliable encryption method, and at the same time, in order to keep it secret, we also have to tighten our internal management, and we can't even promote this epoch-making equipment before the final battle begins, right?" Moltke asked.

"That's right, any equipment has a shelf life, and over time, the other party will always find weaknesses and problems in it! So in order for our military communications to be absolutely secure, we need to keep this machine a secret! The prince nodded.

So, the German military began to secretly replace its own cipher system, before the outbreak of World War 1, the German Navy and Army and its affiliated aviation units had prepared enough Ennig cipher machines and technicians before the war, and when the war suddenly came, Britain and France found that their spy system tended to collapse within a day, of course, this is a later story, not to mention for the time being.

The second is more ~~~! Ask for subscription, ask for tips~~~! (To be continued.) )