"Yes, it's binary." Dan Tai Jing seemed to have already got the answer.

"What is binary?" Ye Shuo and Liang Xia gathered in two faces seeking knowledge.

"It is a number system widely used in computing technology. It is a number represented by two numbers 0 and 1." Dan Tai Jing had already taken out a paper and pen while speaking, "Its base is 2, the carry rule is 'going to one every two', and the borrowing rule is 'borrow one for two'."

"The numbers we use are called 'decimal', that is 'full of ten into one, 20 into two', and so on. At the same time, between decimal and binary, you can freely convert."

"The calculation method of binary to decimal is to calculate from the lowest bit, multiply the number of the bits in the bit by the weight of the original bit, that is, the number of bits in 2 is subtracted by one. For example, the second bit is 2 (2-1 time) square, which is 2; the 8th bit is 2 (8-1) power is 128. Then add all the calculated values."

While speaking, he had already calculated the result quickly on the paper.

19,22,26,21,4,22,18,7

"The maximum number of each number does not exceed 26, and the corresponding letters are converted into—"

svzudvrg

"So?" Ye Shuo frowned. Isn't this still a garbled code?

"This is Caesar encryption." Dan Tai Jing was still calculating quickly on paper and did not look up. "It is a symmetric encryption system that implements encryption and decryption by moving letters by a certain number of digits. All letters in the plain text are shifted backwards on the alphabet (or forward) and then replaced with ciphertext after being offset by a fixed number."

"For example, when the offset is 3, all letters a will be replaced by d, b will become e, and so on, x will become a, y will become b, and z will become c. This offset is usually called the key."

"Now the key has been given in the prompt, the value is 3, that is, all letters are offset by 3 bits, so the corresponding conversion will become like this."

He raised a piece of paper to show it to everyone.

Clear code table:abcdefghijklmnopqrstuvwxyz

Password table: defghijklmnopqrstuvwxyzabc

"What we need to do now is to convert the password into a clear code. That is, find the corresponding letters in the password table and then use the explicit code to replace it. For example, s in the password corresponds to a clear code p, v in the password corresponds to a clear code s, and after all conversions, it will become like this-"

pswrasod

"As far as this is concerned, the answer has been drawn. In order to let everyone understand, I will explain it in detail. The last layer is fence encryption. The principle is to divide the plain text to be encrypted into n groups, and then connect the first word of each group to form an irregular sentence."

"Cracking the fence encryption means dividing it into two columns, which means it becomes like this."

pswr

asod

"Then read it straight up. The result is p-a-s-s-w-o-r-d."

"What is this?" Ye Shuo still didn't understand.

"It is one of the languages ​​of the ectopic plane, and the meaning of 'password'."

After Dan Tai Jing finished speaking, he pressed these 8 letters directly on the keyboard.

The iron door at the end opened. A faint light slowly fell from the other end of the door.

"I guess this level will kill many people..." Liang Xia smiled quietly at Li Yue.
Chapter completed!