Add Bookmark | Recommend this book | Back to the book page | My bookshelf | Mobile Reading

Free Web Novel,Novel online - All in oicq.net -> Romance -> The best urban detective

Text Chapter 81 Coding

Previous page        Return to Catalog        Next page

    The restored version of the letter found on the body was duly delivered the next morning, along with the original; Xia Xiang compared them in front of the director and the police chief, and then had to admit that the expert had indeed done it.  A beautiful piece of work.  Even the original piece of paper is clearer and easier to read than before.  The chemist removed the bloodstains and stains from the leather, and restored the lost color to faded ink marks, and everything worked beautifully.  The color screen also plays an important role in assisting. The filter replaces one color with another color taken from the original, so that color problems are corrected.  Now only a few words here and there are irreparable, but being able to read them is one thing, being able to crack the code is another.  They stared helplessly at the unreadable jumble of letters.

    ¡­¡­

    After a tense hour or two, the following facts were established:

    The letter was written on a thin but rough paper that had nothing in common with any paper found in Link's home.  That raises the possibility that this is a letter he received rather than written by him.

    The letter was handwritten in purple ink, which again didn't look like what Link would use.  In addition, an additional piece of information can be obtained. The person who wrote the letter either does not have a computer or is afraid that his computer will be traced.

    The letter does not use a wheel cipher, nor is it a cipher in which one letter of the alphabet is substituted for another.

    "Anyway," Xia Xiang said happily, "we have a lot of material now. This is not the kind of simple and clear information - the kind of information that makes you wonder whether the letter E is the most common letter in the English language.  . If I ask, this is either a coding method that can be found in a certain book, in which case it must be one of the books of the deceased, and we just need to find them one by one; or  It's a different kind of cipher, and that's what I thought of last night when we saw those marked words in the dictionary."

    "Which password, Xia Xiang?"

    "This is a wonderful code," Xia wanted to say. "If you don't know the key words, it is difficult to decipher. This code was used during World War II, and I had read about it in a detective story a long time ago. It's just that  ¡ª¡ª¡±

    He paused, and the two policemen looked at him expectantly.

    "I want to say that this is a password that ordinary people can learn. Although this encoding method is not very simple, it is still understandable and it is easy to solve it. For this kind of password, Link can easily  Just learn to encode and decode, no special equipment is needed; and it uses the same number of letters as the original message, so it is particularly suitable for long letters."

    "What on earth is this?" the director asked.

    "It's very interesting. You choose a word with six or more letters. The letters in the word cannot be repeated. For example, SQUANDER, this is a word that Link has marked. Then you make a word with five lines horizontally and vertically.  Form, write the keywords in the box, like this.

    "Then you fill the remaining space in alphabetical order, and the existing letters don't count."

    "You can't put twenty-six letters in twenty-five spaces." The director questioned.

    "It really can't, so you have to be like an ancient Roman or a medieval monk and think of I and J as the same thing. Then you get this."

    "Now, let's make up a message. Which one should we make up? 'all-is-known, fly-at-once' is classic and convenient. Let's write this sentence down and make it a two-letter group.  Separate like this. But two identical letters cannot be together. If this happens, we will insert Q or Z or other letters that do not affect reading, as long as the other party can understand it. So our message becomes  Became AL-QL-IS-KN-OW-NF-LY-AT-ON-CE."

    "What if there is only one letter at the end?"

    "Then we will add Q or Z or other letters that do not affect reading to fill the gaps. Now, let's compile the first group, AL. We found that in the table, these two letters form a rectangular  diagonal, and the other two angles with it as a diagonal are SP. So the first two letters become SP in the encoded information. Similarly, QL becomes, IS becomes FA  .¡±

    "Ha!" shouted the Sheriff, "but what about KN? They are on the same vertical line. What will become of them?"

    "You choose the letter immediately below them - TC. The next one is OW, you can do it yourself using the diagonal method."

    "MX?"

    "It's MX, continue."

    "SK," the director said.?While happily connecting diagonal lines between this corner and that corner, "PV, NP, UT¡ª¡ª"

    "No, it's TU. If your first diagonal is drawn from bottom to top, then when you take the other diagonal, you should also draw it from bottom to top. ON equals TU, NO is UT."

    "Yes, yes. TU, ha!"

    "What's wrong?"

    ¡°CE is on the same level.¡±

    "Then choose the one closest to the right of each letter."

    "But there is no letter to the right of the letter C."

    "That's the one on the far left in this row."

    This confused the director for a while, but he finally came up with the DR.

    "That's right. So your encoded information is: SP-FA-TC-MX-SK-PV-NP-TU-DR. In order to make it look better, and in order not to reveal the way you encoded it,  You can break the letters to any length you like. It doesn't matter. The person receiving this message will ignore these modifications and will simply group the letters two by two, with the help of the password form  Read next. First look for the diagonal line. If it is a vertical line, look for the letter adjacent to it. If it is on the same horizontal line, look for the letter adjacent to the left."

    The two policemen considered the form carefully for a while, and then Gu Pengfei said:

    "I see, Xia thought. This is very clever. You can't guess based on the most common letter, because if it is different from the letter it matches, you will get a different corresponding code letter every time. And you can't  Guessing individual words because you don't know where the word starts and ends. Is it possible to decipher it without the keywords?"

    "Yes." Xia wanted to say, "Any code that has been encoded can be decoded. You have to be patient and not afraid of pain - except for the codes in some books that are indeed unbreakable. I know a person who  He specialized in this field for many years. Those code tables were so ingrained in his life that when he got chickenpox, his rashes were not dots but squares."

    {Piaotia Literature www.piaotia.net thanks all book friends for their support, your support is our greatest motivation}
Didn't finish reading? Add this book to your favoritesI'm a member and bookmarked this chapterCopy the address of this book and recommend it to your friends for pointsChapter error? Click here to report