Please answer in C++ Your country is at war and your enemies are using a secret code to communicate with one another. You have managed to intercept a message that reads as follows: :mmZ\dxZmx]Zpgy The message is obviously encrypted using the enemy's secret code. You have just learned that their encryption method is based upon the ASCII code. Appendix 3 shows the character set. Individual characters in string are encoded using this system. For example, the character "A" is encoded using the number 65, and "B" is encoded using the number 66. Your enemy's secret code takes each letter of the message and encrypts it as follows : if (orginalChar + key > 126) then encryptedChar = 32 + ((orginalChar + key) -127) else encryptedChar = (orginalChar +key) For example, if the enemy uses key = 10 then the message "Hey" would be encrypted as: Character ASCII code H 72 e 101 y 121 Encrypted H = (72 +10) = 82 = R in ASCII Encrypted e = (101 +10) = 111 = o in ASCII Encrypted y = 32 + ((121 + 10) - 127) = 36 = $ in ASCII Consequently, "Hey" would be transmitted as "Ro$." Write a program that decrypts the intercepted message. The ASCII codes for the unencrypted message are limited to the visible ASCII characters. You only know that the key used is a number between 1 and 100. Your program should try to decode the message using all possible keys between 100. When you try the valid key, the message will make sense. For all other keys, the message will appear as gibberish.

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter15: Recursion

Section: Chapter Questions

Problem 20PE

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Please answer in C++

Your country is at war and your enemies are using a secret code to communicate with one another. You have managed to intercept a message that reads as follows:

:mmZ\dxZmx]Zpgy

The message is obviously encrypted using the enemy's secret code. You have just learned that their encryption method is based upon the ASCII code. Appendix 3 shows the character set. Individual characters in string are encoded using this system. For example, the character "A" is encoded using the number 65, and "B" is encoded using the number 66.

Your enemy's secret code takes each letter of the message and encrypts it as follows :

if (orginalChar + key > 126) then

encryptedChar = 32 + ((orginalChar + key) -127)

else

encryptedChar = (orginalChar +key)

For example, if the enemy uses key = 10 then the message "Hey" would be encrypted as:

Character ASCII code

H 72

e 101

y 121

Encrypted H = (72 +10) = 82 = R in ASCII

Encrypted e = (101 +10) = 111 = o in ASCII

Encrypted y = 32 + ((121 + 10) - 127) = 36 = $ in ASCII

Consequently, "Hey" would be transmitted as "Ro$."

Write a program that decrypts the intercepted message. The ASCII codes for the unencrypted message are limited to the visible ASCII characters. You only know that the key used is a number between 1 and 100. Your program should try to decode the message using all possible keys between 100. When you try the valid key, the message will make sense. For all other keys, the message will appear as gibberish.

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