3. Encryption Algorithm The encryption algorithm shall consist of two parts: (1) substitution, and (2) encryption on blocks of size 4 x 4 characters. The detailed description of the steps is as follows: a) Preprocessing Remove any punctuation and whitespace characters from the input. o Example: Input Text: ENCRYPT THIS MESSAGE USING THE ALGORITHM DESCRIBED BELOW. Output Text: ENCRYPTTHISMESSAGEUSINGTHEALGORITHMDESCRIBEDBELOW b) Substitution

Computer Networking: A Top-Down Approach (7th Edition)
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Chapter1: Computer Networks And The Internet
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in the image below, create the c++ code for each function labeled a through c

Remove any punctuation and whitespace characters from the input.
o Example:
3. Encryption Algorithm
The encryption algorithm shall consist of two parts: (1) substitution, and (2) encryption on blocks
of size 4 x 4 characters. The detailed description of the steps is as follows:
a) Preprocessing
Input Text:
Output Text: ENCRYPTTHISMESSAGEUSINGTHEALGORITHMDESCRIBEDBELOW
b) Substitution
Perform a polyalphabetic substitution using the Vigenère cipher on the input file with the
key provided in the key input file.
Example:
Key:
Input Text:
Output Text: WVOGJTXQHUHXICWYYMGHTRKQHQPWKYVGLPYSPWGOINTOFOPMO
Example:
Input:
WVOG
JTXQ
HUHX
ICWY
ENCRYPT THIS MESSAGE USING THE ALGORITHM DESCRIBED BELOW
YMGH
TRKQ
HQPW
KYVG
LPYS
PWGO
SIMPLEEXAMPLEKEY
c) Padding
Steps d) - f) are performed on blocks of size 4 x 4 characters formed from the output of
step b (i.e., substitution). They are parts of AES and as in any block cipher, the input has
to be padded. In this particular case, pad the output from the previous step with A's so
that the length of the message is divisible by 16.
Page
ENCRYPTTHISMESSAGEUSINGTHEALGORITHMDESCRIBEDBELOW
Output:
WVOG
JTXQ
HUHX
ICWY
YMGH
TRKQ
HQPW
KYVG
LPYS
PWGO
hp
2 > o
Transcribed Image Text:Remove any punctuation and whitespace characters from the input. o Example: 3. Encryption Algorithm The encryption algorithm shall consist of two parts: (1) substitution, and (2) encryption on blocks of size 4 x 4 characters. The detailed description of the steps is as follows: a) Preprocessing Input Text: Output Text: ENCRYPTTHISMESSAGEUSINGTHEALGORITHMDESCRIBEDBELOW b) Substitution Perform a polyalphabetic substitution using the Vigenère cipher on the input file with the key provided in the key input file. Example: Key: Input Text: Output Text: WVOGJTXQHUHXICWYYMGHTRKQHQPWKYVGLPYSPWGOINTOFOPMO Example: Input: WVOG JTXQ HUHX ICWY ENCRYPT THIS MESSAGE USING THE ALGORITHM DESCRIBED BELOW YMGH TRKQ HQPW KYVG LPYS PWGO SIMPLEEXAMPLEKEY c) Padding Steps d) - f) are performed on blocks of size 4 x 4 characters formed from the output of step b (i.e., substitution). They are parts of AES and as in any block cipher, the input has to be padded. In this particular case, pad the output from the previous step with A's so that the length of the message is divisible by 16. Page ENCRYPTTHISMESSAGEUSINGTHEALGORITHMDESCRIBEDBELOW Output: WVOG JTXQ HUHX ICWY YMGH TRKQ HQPW KYVG LPYS PWGO hp 2 > o
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