“阅读了松。David's got a text hg0088注册 from his frien“

> 娱乐 > 作者:admin 2018-11-04 06:31 编辑:周建平
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  阅读了松。

  David's got a text from his friend Sam. Can you undersd it?

  7,15 20,15 20,8,5 16,1,18,11

  This was in code (稠密码, 代码). How many letters are there in the English alphabet?

  Twenty-six. So can you read it now?

  A

  B

  C

  D

  E

  F

  G

  H

  I

  J

  K

  L

  M

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  R

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  T

  U

  ...

  1

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  11

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  13

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  21

  ... David decided to use a different code in his answer to Sam. This time, he was putting A instead of B,

  B instead of C, and so on. His to Sam shown on the right was very short. Can you undersd?

  A

  B

  C

  D

  E

  F

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  K

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  N

  O

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  X

  Y

  Z

  B

  C

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  E

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  A Sam guessed David's code, and he replied: ZESDQ, RBGNNK. When David's little sister saw the ,

  she felt puzzled. She couldn't read it at all. But David was very happy that his sister couldn't read his !

  Lots of people use codes to send secret s. In a war, secrets are very import so soldiers often

  send each other s in code. Nowadays, we can use computers to make and break difficult codes. Even

  before computers, people invented other machines to do this.

  Here's a famous machine that Germans used in the Second World War (1941-1945). It's called the Enigma

  Machine. The machines were very big, heavy and expensive. Every day they changed the codes automatically,

  and this made it almost impossible for anyone to break the codes. The person sending a had one

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