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Using the shift cipher with key = 12, what will be the result after decrypting the message "TQXXA"?

Using the shift cipher with key = 12, what will be the result after decrypting the message "TQXXA"? Correct Answer HELLO

The correct answer is option 1.

Concept:

In a shift cipher, each letter in the message is replaced by a letter that is a specified number of places farther down the alphabet. This number will be referred to as the encryption key. It's just the shift length that we're utilizing.

A given plaintext is encrypted into ciphertext by shifting each letter of the given plaintext by n positions.

The numbers given to the 26 letters of the alphabet are as follows:

 

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

 

The encryption process is (the x here represents a letter from plaintext): x+n (mod 26)

The decryption process is (the x here represents a letter from ciphertext): x-n (mod 26)

The given data,

shift cipher with key N = 12

ciphertext = "TQXXA"

The plain text of the letter "T" = 19-12(mod 26)= 7=H

The plain text of the letter "Q" = 16-12(mod 26)= 4=E

The plain text of the letter "X" = 23-12(mod 26)=11=L

The plain text of the letter "X" = 23-12(mod 26)=11=L

The plain text of the letter "A" = 0-12(mod 26)= 12=O

Hence the correct answer is HELLO.

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