b) Substitution Perform a polyalphabetic substitution using the Vigenère cipher on the input file with the key provided in the key input file. 4 o Example: Key: Input Text: Output Text: SIMPLEEXAMPLEKEY ENCRYPTTHISMESSAGEUSINGTHEALGORITHMDESCRIBEDBELOW wVOGJTXQHUHXICWYYMGHTRKQHQPWKYVGLPYSPWGOINTOFOPMO

Computer Networking: A Top-Down Approach (7th Edition)
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ISBN:9780133594140
Author:James Kurose, Keith Ross
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Chapter1: Computer Networks And The Internet
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Complete the code in c++ for b and c in the image below
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:
Output Text: ENCRYPTTHISMESSAGEUSINGTHEALGORITHMDESCRIBEDBELOW
b) Substitution
Key:
Input Text:
Output Text:
Perform a polyalphabetic substitution using the Vigenère cipher on the input file with the
key provided in the key input file.
O Example:
o Example:
Input:
WVOG
JTXQ
HUHX
ICWY
YMGH
TRKQ
HQPW
KYVG
ENCRYPT THIS MESSAGE USING THE ALGORITHM DESCRIBED BELOW.
LPYS
PWGO
Page
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.
ENCRYPTTHISMESSAGEUSINGTHEALGORITHMDESCRIBEDBELOW
wVOGJTXQHUHXICWYYMGHTRKQHQPWKYVGLPYSPWGOINTOFOPMO
Output:
WVOG
JTXQ
HUHX
ICWY
YMGH
TRKQ
HQPW
KYVG
LPYS
PWGO
2
>
0
Transcribed Image Text: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: Output Text: ENCRYPTTHISMESSAGEUSINGTHEALGORITHMDESCRIBEDBELOW b) Substitution Key: Input Text: Output Text: Perform a polyalphabetic substitution using the Vigenère cipher on the input file with the key provided in the key input file. O Example: o Example: Input: WVOG JTXQ HUHX ICWY YMGH TRKQ HQPW KYVG ENCRYPT THIS MESSAGE USING THE ALGORITHM DESCRIBED BELOW. LPYS PWGO Page 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. ENCRYPTTHISMESSAGEUSINGTHEALGORITHMDESCRIBEDBELOW wVOGJTXQHUHXICWYYMGHTRKQHQPWKYVGLPYSPWGOINTOFOPMO Output: WVOG JTXQ HUHX ICWY YMGH TRKQ HQPW KYVG LPYS PWGO 2 > 0
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