"Luo, go and have a drink with me?"

"Mr. Yadley, I don't have time to drink with you. I have a lot of documents to read and organize." Luo Yao worked hard.

Since Dai Yunong gave him the establishment of a secret code deciphering center, he had to do it seriously. Moreover, secret code deciphering is very important in intelligence work.

If you can grasp the enemy's communication secrets, then all the enemy's deployment will be under your own eyes and nose, which is much more than sending intelligence agents to lurk inside the enemy to obtain intelligence security.

Of course, it is not that there is no need to send lurking agents to the enemy or intelligence, but that is also necessary. Intelligence cannot be an isolated evidence, but must be verified by each other.

After all, secret communications can also be forged, and the enemy can also use this for tactical and even strategic fraud.

"Luo, do you understand these?" Yadley looked down and looked at it, shocked. Luo Yao was actually sorting out the information he brought about the password cracking.

These things were all taken out from the bottom of his house box. In the United States, these information is also classified, but the Americans seem to not pay attention to these, so they can only bring them to China to see if they can find opportunities to play their role.

Some of the information is very scattered, and he is a very casual person in his life. Although he has collected it, he has not organized it accordingly. Even his novels are dictated by himself and others have helped him to polish and organize them.

If he had not obtained royalties from the publication of the novel, he would have lived an extremely poor life in the United States over the years, which was very miserable.

Otherwise, he would not be attracted by the high rewards.

If you want to talk about how many noble sentiments you have, it is actually nonsense. He just came here for money. Without money, how could he live a life of luxury?

Without good wine and without women, what fun is there to say about life.

"Some are OK, some are not OK." Luo Yao nodded.

"Oh, is that?" Yadley didn't believe it very much. No one looked at his things, usually kept at home, and threw them under the bed, making them a little moldy, and even felt that they were hard. If he hadn't come to China this time, he would have forgotten that he had these things in his hands.

Many of them are basic. Of course, he considered that China might need these, so he brought them here.

Because he needs to use these to train some people in this field, he should start with the most basic things. Censor code decoding is not something that a person can do. He also needs a lot of people to divide the work and do a lot of work, otherwise, a person will not be able to complete such a large amount of work.

This is a job that races against time. When you successfully decipher it, the battle may be over. What's the point?

There are not enough people, it will definitely not work.

What Yadley had to do when he came to China was to help China train a group of password-breaking talents. Of course, China is not without such talents, but it is not a system, or there is no professional training. They all came out by themselves, and they followed the model of masters leading apprentices.

Moreover, password cracking is a special industry that cannot be entered by anyone and requires strict assessment and political review.

In fact, this type of talent is very scarce in China. Although the government's secret code deciphering work of Japan has made some progress, it is very slow due to technology and talents, and Japan is ahead of them in this regard.

Intelligence shows that Japan has achieved great results in deciphering China's secret codes, and even basically grasps some of the rules of China's secret codes.

In the battle, China suffered a great loss. Before the fight started, its own deployment was known to the enemy. How can we fight this battle?

There are also some frontline generals who are not confidential and use clear code when fighting. Isn’t this just telling the enemy how to fight?

How can this battle be defeated?

"Ro, can I ask you a few questions?" Yadley became interested in this matter.

"certainly."

"Ancient Rome had a means of encrypted communication, the 'Spartan Stick'. Do you know what it is and can you tell its encryption principle?"

"Mr. Yadley, you are wrong. The 'Spartan Stick' is an encrypted communication method used by the ancient Greek army. Its use is to wrap the parchment paper in a long strip-shaped shape on the wooden stick, then write on it, and after untiing the parchment paper, there is a string of messy characters on it. Only by wrapping it on the stick of the same thickness in the same way can the content on the paper be read out." Luo Yao smiled slightly.

Yadley nodded. He actually deliberately called ancient Greece as ancient Rome, just to take the postgraduate entrance examination to see whether Luo Yao could hear it.

Unexpectedly, the other party was so careful that he could hear it all at once.

"In fact, this typical 'transposition method' used by this 'spartan stick' to encrypt the communication content. As long as you know the method, it is very easy to crack it." Luo Yao continued.

Yadley nodded. As long as he had learned common sense in password decoding, it was not difficult to know this knowledge point. However, considering that Luo Yao was a Chinese, he was still very good at knowing the encryption communication methods of the ancient Greeks. In the intelligence community, it would be good to know two or three out of ten.

"Okay, next question, more than two thousand years ago, a consul invented by an ancient Roman consul. We call it Caesar Encryption Method. Ronaldo, do you know how the Caesar Encryption Method is encrypted?" Yadley continued to ask.

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"Haha, Caesar's encryption method is actually the prototype of our encryption code today. He uses the encryption of 'single letter replacement'. The principle is very simple and easy to crack..." Luo Yao talked happily.

Yadley was very surprised. Although these were just two simple questions, not many people knew about it, and those who learned secret communication might not know it.

Because you know that this is the basis for password cracking, you don’t understand the principle, how to crack passwords.

In essence, the current password communication encryption methods are all derived from "alphabet replacement", but they are just changing the rules of replacement.

Once you master the rules, you will crack the password.

It sounds simple, but it is difficult to do.

"Luo, if I write a paragraph, you use a single-letter replacement method to encrypt it, can you decipher it?" Yadley became more and more interested in Luo Yao.

"I can give it a try." Luo Yao nodded. He could write a password book by himself and crack a small single-letter replacement encryption. That's not a pediatrician.

The so-called single-letter encryption is not irregular. If you create a single-letter encryption table just to replace a sentence, it can actually be deciphered, but it takes a little longer.

Single-letter encryption cracking requires a certain reference text, and then the reference text is analyzed. Simply put, it is to use probability science in mathematics.

For example, in an article written in English, the probability of 26 letters appearing in one article is enough to replace the letters with the same probability in the encrypted sentence.

Of course, the cipher text of a sentence is too short. The longer the text, the easier it is, because if you calculate the probability, it must be that the more words the more accurate it is.

But just try it one by one, it is only a matter of time before the cryptographic text is cracked.

Someone has long studied the probability of the 26-letter English appearing in an article, and there is no need to count it anymore. If it is "multiple alphabet replacement encryption", it will be much more difficult, and the longer the article, the more difficult it is to crack it.

Yadley randomly composed a replacement alphabet, then wrote a conversation with this alphabet, encrypted it, and gave it to Luo Yao.

Luo Yao took a look and found that the conversation was not long.

Four sentences, the third sentence is a little long, while the others are very short.

But literally, it is just some meaningless letters that cannot form words at all and cannot understand them at all, but there must be content in them.

Because it is a "single-alphabet replacement", Luo Yao first began to calculate the frequency of each letter in this cipher text, and then counted it and replaced it.

The basic method of cracking the replacement encryption method can be called the probability statistics method.

Of course, different characters and languages ​​also have their own characteristics, such as what is the most commonly used word in English, what is the most commonly used word in English, and what is the most commonly used word, etc.

These rules can be summarized and applied to password deciphering and can achieve twice the result with half the effort.

As long as you master these, it is actually very simple to crack a single-letter encrypted ciphertext. As long as you are not too low in IQ, you can complete it quickly.

Moreover, Luo Yao has already studied this aspect. Although he is self-taught, he is not a little better than those who have become monks halfway through.

It took less than ten minutes!

The single-letter encrypted cipher text written by Yadley was directly cracked by Luo Yao, which made him feel incredible.

Luo Yao saw that this wasn’t the code word he used to connect with Yadley!

Of course, he didn't know it before deciphering it, and couldn't see it, because there was no space in the middle of this cipher text, and it was impossible to guess the length of the sentence.

"Luo, you definitely have the talent to decipher secret codes!" Yadley excitedly raised a thumbs up at Luo Yao.

"Mr. Yadley praised it. Single-letter substitution deciphering is the basis of code deciphering. Anyone can do it after a certain amount of training, but practice makes perfect." Luo Yao said with a humble smile.

"Luo, I think you can become my assistant in China!" Yadley said solemnly.

"assistant?"

"Yes, I need an assistant in China. You are not only proficient in English, but also know how to decipher the code, so it will be more convenient for us to communicate." Yadley said, "I will apply to China."

"Mr. Yadley, didn't I tell you yesterday that I will be responsible for your life and work in China?" Luo Yao said.

"Yes, I forgot, sorry, what did I do with you just now?"

"Discuss on how to carry out work in China..."

"Isn't I here to drink with you?" Yadley said with a slap in his forehead.
Chapter completed!