"I'll see, what kind of password is this, and it can be worth so much money."

Lin Yunqian took the notebook in Wen Yifan's hand and carefully studied the password on the book:

..././--./.. -./.. /-/.---/-.. /-./---/-.. /.---/..../.-.. /-.. -/--.-/-/--/.-/-./.. /.. -./.--./.---/--/.-/.-./-/.---/--./-/.. /.-/.-./-.../--./.. -./---/---/.--./.-/-./.. -./.. -./--/.---/.---/-.. /.-.. /.-.. /.../--./-./.-.. /-.. -/.-./..../-.. /.-/--.-/---/.---/.. -./-./.-.. /-.. -/--/.---/.---/--./.-.. /.. -/.---/-.. /-./-./.-/.-./-.../.---/.-/.-./---/.--./.. -./.../.-.. /-.. /--/-.../--./--./.-./.-./.---/-.. /--.-/-./-.. -/.-././.-.. /-.. /.. /.-./--/--./-./-./.-/--/./--/.. -./.-./.-./--/-.. -/-/-./--./--/..../.-.. /.. -./.. /---/.--./.. -./-.-/

Looking at the content of this point and line, he chuckled and shook his head, and said, "What, the first layer of encryption, is it such a simple Morse code encryption?" ”

"Maybe the first layer should just be a warm-up, otherwise if it's all so simple in the future, I'm afraid that the two thousand yuan will soon be taken away by others."

Wen Yifan replied with a smile, but secretly laughed in his heart.

The figure of $1,000 is also a trap I have set, and this number is a slightly larger number for most people, which can make ordinary families actively decipher the code, so that they can hide my identity, but will not let them be so enthusiastic that they devote all their time to deciphering the code and delay their studies or work. Because of this, even if everyone is actively looking for a way to decipher the code, they will not take all the time to crack it. In this way, those who go all out to crack the code and are ahead of most people's progress are suspected of being "heirs".

"Yes, it doesn't seem simple, but the first layer of encryption is still easy to translate." ECHOING THE VOICE, WEN YIFAN HELD THE PEN IN HIS RIGHT HAND AND QUICKLY WROTE THE FOLLOWING: SEGFITJDNODJHLXQTMANIFPJMARTJGTIARBGFOOPANFFMJJDLLSGNLXRHDAQOJFNLXMJJGLUJDNNARBJAROPFSLDMBGGRRJDQNXRELDIRMGNNAMEMFRRMXTNGMHLFIOPFK

"In this way, what we need to face is the second layer of encryption."

Lin Yunqian slowly picked up the newspaper and silently recited the poem on the paper: "The arrogant man walks through the boundless garden / That is the prison of Virginia / Flowers laugh at his ignorance / If you can look at yourself / You will know that you will be burned in hell, maybe these are the hints of the second layer of encryption." ”

- Clever, Lin Yunqian. You're not as smug as you seem. So, what conclusions can you, who share the same ideas as me in every way, come to after reading this poem?

"I think about it, if you take out the content of the second paragraph alone, maybe the other party should use a Virginia password to encrypt it." Lin Yunqian slowly put down the newspaper and said: "The prison of Virginia, combined with various place names, cannot match, and this name will definitely not appear here meaninglessly, so there should be no problem in inferring that the second layer of encryption is the Virginia encryption method." ”

"So, you, who can quickly derive the Virginia code, usually have a certain amount of research on classical passwords?" As if he had suddenly discovered something interesting, Wen Yifan asked with a smile, "After all, only those who have studied classical codes know the point of this term." ”

"I just know a little bit.,I usually like to flip through some books about passwords.,Because I like the process of cracking passwords.,Sometimes I also like to make some encrypted content for others to crack.。 Laughing and spreading his hands, Lin Yunqian replied, "However, a person like this who stiffly increases the difficulty of password deciphering by piling up the number of encryption layers is really a boring person - this kind of encryption is meaningless, and even has long abandoned the unique 'beauty' of classical passwords, and is completely a hooligan." ”

- 50% coincides, interesting, Lin Yunqian, why are you and I thinking so similar? What kind of education did you have?

You...... Can it be trusted?

The curiosity in his heart deepened again, and he quietly suppressed the smile on the corner of his mouth, and softly echoed: "Yes, it is really a boring puzzle. ”

"However, in order to convince the person who is defeated, we had better decipher the whole code before the person who thinks he is smart." Stretching, he looked like he had pulled himself together, "How about it, are you interested in deciphering it together?" ”

- Even the reason why I focused on passwords next helped me figure it out. So smooth...... Or will you have good luck staying with him?

- How is it possible~

"Okay, let's solve this puzzle together." A smile appeared on the corner of his mouth, Wen Yifan got up, pulled out the heavy book from the bookshelf, and put it on the table. After a moment's thought, he turned the book and turned to the page labeled "Vigenère Cipher".

"The Virginia cipher, also translated as the Vergenard cipher, is an encryption algorithm that uses a series of Caesar ciphers to form a cipher alphabet, which is an extended multi-table cipher based on the Caesar cipher, which was created by the Italian cryptographer Mr. Giovan Battista Bellaso, and was later mistakenly thought to be created by the French diplomat Blaise de Vigenère, so it is called the Virginia cipher." Slowly raising his head, he looked at Lin Yunqian and smiled slyly, "So, I actually prefer to call it the 'Belasso Code', you shouldn't mind." ”

"The name is just a label that distinguishes it from other passwords, and in fact, the Belasso password itself is a good way to encrypt it, so I don't dwell on the icing on the cake." Picking up the glass next to him, Lin Yunqian took a sip of water, smiled, and said in a somewhat gentle tone: "Then, let's call it 'Belasso Code' in the future." ”

- Fifty-five percent, now I can be sure that keeping you behind was the right decision, and I don't want to be an enemy of people like you.

"Thank you," he nodded slightly, and without saying too much, he continued, "Since you know this kind of cipher, you should know that the elements of Belasso's cipher are keys, ciphertext, plaintext, and ciphers. ”

"Of course, this should be the most basic knowledge of the Belasso code."

"So the question is, now we have the ciphertext, the cipher table also has a very detailed diagram in this book, and the plaintext is the answer we are looking for. However, the most critical key to deciphering Belasso's code, which is not mentioned in this newspaper, makes me a little confused. The fingers of his right hand tapped on the table, Wen Yifan smiled and said: "If you want to decipher the Belaso code, all the puzzles that don't give the key are all hooligans, and obviously, that guy who thinks he's smart won't be such a scoundrel." ”

"So, you suspect that the key is actually hidden in this little poem." After reading the poem again, Lin Yunqian glanced at him and couldn't help laughing: "I'm afraid, smart as you, you already have your own ideas, I just want to hear my conjectures; Or maybe I just said something I was trying to guide me to say what I thought, didn't it? ”

- Amazing, Lin Yunqian, Bujin can guess my thoughts so quickly, and he can say it in front of me without hesitation, maybe he is really a trusted helper?

"Yes, I do want to hear what you think." After admitting it generously, Wen Yifan looked at him quietly, with a bit of expectation in his eyes.

"How to say it, the whole little poem seems to be full of hints, but it doesn't seem to give any hints at all," Lin Yunqian looked at the poem in front of him, thought for a while and said: "If the other party uses the type of password and then the key, there is no doubt that the first sentence can be discarded, and the key is hidden in the remaining three sentences." ”

"If we imagine him as a man who thinks he is smart, it is clear that he will do it. And if you look closely at the first and third sentences, 'The arrogant man walks through the infinite garden' and 'The flowers laugh at his ignorance', these two sentences are obviously intended to lead to the second sentence and the third and fourth sentences, so the probability of the key being in it is very low, because if the seal hides the key, then the content will be meaningless, so I will focus on the last two sentences. ”

"Very clear idea, tell me how you should determine the key." Wen Yifan nodded and replied in the affirmative.

"It's very simple, we all know that the key is the most likely to be a word, so it's good to try every noun and verb word by word according to the result of the highest probability, and if not, then consider other possibilities." Underneath "Scrutiny", "Self", "Incineration", and "Hell", he asked, "Do you have a program that can decipher Belasso's code, or I'll give you a handwritten one on the spot." ”

"Plaintext = [26 + (ciphertext - key)] Mod 26 + 1, with this formula, everything is made simple." Typing a line of code into the computer's controller, he clicked enter, and a page opened, "Please, try your idea." ”

"So first, let's assume that the key is 'survey,'" he tapped enter after typing the word into the key, and came up with the result:

KYXAMRBXEJHHZFOLXKSHZATHEUIONELCRMFEXIFKELXZDENBDFJBRJPLYYEOGDWIPVEDABPSBXEIEPTDRMSNXMCYQZYAIMNBIHOMIJVCIHKLFUDZQDJLDSXLYGYGJGGJWF

"It doesn't look like it's been declassified." Lin Yunqian shook his head, then typed in the word "hell", and got the result:

ZIRQPXUOUSOUOPIBAQLYPJAUTECEQKETHVMRMSZAHRQQTNUOSPDRUPICOHLBVNQYSBXUQKWFQHYYHVMUHVZAMWWOTFRRYVUOXRICLPOTYQRYUEXPTJCCTBEYNQSWMMZAMO

"It's not like the final answer, but it's even more confusing," Wen Yifan commented, "However, it's better to record it so as not to miss anything." ”

Immediately afterward, the two used the software to try the words "oneself" and "burn" in a row, and the results were still as messy as garbled.

"Actually, you already know that these words are useless, don't you?" Wen Yifan looked at Lin Yunqian, who was trying the last word, and couldn't help laughing, "I haven't seen a little disappointment on your face after failures. ”

"You saw through it," Lin Yunqian generously admitted, "Indeed, I know that it is not possible for him to put the key directly in the superficial meaning, but in order to prevent us from overestimating him, we still tried it." Next, let's take a look at the second meaning. ”

"First of all, the most likely place to hide information should be 'examine yourself' and 'burn in hell', so it seems that the key should be hidden in these two places."

"'Examine yourself' should be a command for the protagonist of the poem to examine himself, which is explained in the poem: 'the arrogant', even appears twice, so the word is probably the key." He slowly wrote the word "madcap" on a piece of paper, and then said: "But to be on the safe side, I still thought about the meaning of 'burned in hell', and found that not only did the original text not mention the relevant content, but even the foreshadowing of life has too much meaning, so where there may be ambiguity, I will not make it a key." ”

Type the word "madcap" into the computer, and after the calculations, the computer gives the answer:

EEJHIIVDQQDYTLASTBMNLHPYYAUVJVFIDTBVRORRACRFPLJSXLVINAJRKFAFAJIPLMYJMILJVDQPAGNJDTOERSOFMQSGUTJSCNATEAPIUOGCZAPGMUDRPZTCSMKNFXAPIM

At this moment, Lin Yunqian seemed to be in a state of thought, because the content he got was obviously not like a regular password.

"It seems that there is still a layer of encryption," Wen Yifan looked at the password in front of him and chuckled, "You should know that under the same term, there are many interpretations of English." ”

"Ah, what do you mean......" Lin Yunqian immediately understood what he meant, "There is another term for 'arrogant'?" ”

"Yes, the full name of the word is 'megalomania', which literally translates to 'megalomania', and of course it can also be translated as 'arrogant'." Wen Yifan typed this word into the computer, smiled and said: "Now, the eighth layer of encryption should be deciphered!" ”

GAAFXFXDAGDXDFXFFAAAAFDFGAGFXGGAAFXAFDADAAXFAFDDAXGGADXFDXAFAXFADXAFDGAGXDAFAFXDAGADFFDDAXAGGDXDDFXFAFDXDAGAFAAAGFGDAXGFGADFFXADFX

With the press of the Enter key, the software unlocked the encryption of Belasso's password almost instantly, revealing the original appearance of this message.

"It's all composed of the five letters 'ADFGX', which should be the seventh layer of encryption content." Lin Yunqian nodded, "If you take out this content alone, it should be the Polybios phalanx encryption." ”

"Yes, but I'm wondering, if that's all there is to it, is Layer 7 encryption a little too simple?" Wen Yifan typed the entire password into the software called "Polybius Cipher", and soon came up with the result:

dlpkqwmpcaqrdtudlehfaplgvtfpwlvcwlrqkllkqfngvqikmplwbdcaoivodmxfx

"It doesn't look like it's unraveled, it's more messy." Lin Yunqian shook his head and denied the answer.

"yes, if it's really what I imagined, maybe I'll have to wait for the next hint." Looking at the string of letters on the computer, he also fell silent......

The eighth layer of the Bellaso code, cracked.