Question: Computer Network Note the plaintext and ciphertext in monoalphabetic - additive cipher images below: Picture . Plaintext and ciphertext characters in mod26 In the figure,

Computer Network

Note the plaintext and ciphertext in monoalphabetic - additive cipher images below:

Computer Network Note the plaintext and ciphertext in monoalphabetic - additive cipher

Picture . Plaintext and ciphertext characters in mod26

In the figure, each character, both lowercase (plaintext) and uppercase (ciphertext) characters, is assigned an integer value mod26 (not ASCII). The encryption algorithm used is to add the plaintext value to the key used. Meanwhile, the decryption algorithm used is subtracting the ciphertext value from the key used. All values are expressed in integer mod26 (0-25).

a.If key = 20 is used, encrypt the plaintext with IZHAF letters

b. If the key = 20 is used, describe the 6 letter ciphertext of the name IZHAFAFIELDWOEPRUAT

c. If key = 10 is used, describe the 6-letter ciphertext of the name with conditions such as point b

Plaintext 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 Ciphertext-ABCDEFGHIJKLMNOPQRSTUVWXYZ Value - 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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