Requirements The symbol denotes user input $ python 3 vigenere py e Enter the key helloworld Enter the plaintext The quick brown fox jumps over the lazy dog Ciphertext is Alp bieqb muvay qct xlxsz sgpf pvv wdgc ozu $ python 3 vigenere py d Enter the key helloworld Enter the ciphertext Alp bieqb muvay qct xlxsz sgpf pvv wdgc ozu Plaintext is The quick brown fox jumps over the lazy dog Grouping $ python 3 vigenere py e g 5 Enter the key helloworld Enter the plaintext The quick brown fox jumps over the lazy dog Ciphertext is ALPBI EQBMU VAYQC TXLXS ZSGPF PVVWD GCOZU $ python 3 vigenere py d g 5 Enter the key thelloworld Enter the ciphertext Alp bieqb muvay qct xlxsz sgpf pvv wdgc ozu Plaintext is THEQU ICKBR OWNFO XJUMP SOVER THELA ZYDOG $ python 3 vigenere py e g 5 Enter the key helloworld Enter the plaintext The quick brown fox Ciphertext is ALPBI EQBMU VAYQC T In the third example, since we didn't have enough characters to make a full group, our last group just wont have the full amount Errors $ python 3 vigenere py e d Error Cannot have both encrypt and decrypt mode $ python 3 vigenere py g 4 Error Program mode was not specified Use e for encrypt and d for decrypt $ python 3 vigenere py Error Program mode was not specified Use e for encrypt and d for decrypt $ python 3 vigenere py g e Error You must supply an integer of at least zero with the grouping flag Handling user input $ python 3 vigenere py e Enter the key Habcd 1 2 3 4 Error Keys must be at least 1 character, and consist only of alphabetic characters Enter the key Habcd Enter the plaintext HHello, World Ciphertext is Hfnoo, Xqule $ python 3 vigenere py e Enter the key Error Keys must be at least 1 character, and consist only of alphabetic characters Enter the key Habcd Enter the plaintext Hello, World Ciphertext is Hfnoo, Xqule $ python 3 vigenere py e Enter the key Habcd Enter the plaintext Ciphertext is It is okay for the user to not enter a message The key is required, though You should keep asking for the key until a valid one is provided by the user Your program will be required to both encrypt and decrypt ciphertext The mode is specified by a program argument flag, e for encrypt mode, and d for decrypt mode Your program should work for both upper and lowercase plaintext ciphertext keys , even if the key and plaintext ciphertext do not have the same case as eachother Your program should also have another option for grouping output characters together This can be specified by the g g e d Show all images Show all images Show all images done loading

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Question: Requirements The # symbol denotes user input $ python 3 vigenere.py - e Enter the key: helloworld Enter the plaintext: #The quick brown fox jumps

Requirements The # symbol denotes user input

$ python

3

vigenere.py

-

Enter the key: "helloworld

Enter the plaintext: #The quick brown fox jumps over the lazy dog.

Ciphertext is: Alp bieqb muvay qct xlxsz sgpf pvv wdgc ozu.

$ python

3

vigenere.py

-

Enter the key: "helloworld

Enter the ciphertext: #Alp bieqb muvay qct xlxsz sgpf pvv wdgc ozu.

Plaintext is: The quick brown fox jumps over the lazy dog.

Grouping

$ python

3

vigenere.py

-

-

5

Enter the key: "helloworld

Enter the plaintext: #The quick brown fox jumps over the lazy dog.

Ciphertext is: ALPBI EQBMU VAYQC TXLXS ZSGPF PVVWD GCOZU

$ python

3

vigenere.py

-

-

5

Enter the key: thelloworld

Enter the ciphertext: #Alp bieqb muvay qct xlxsz sgpf pvv wdgc ozu.

Plaintext is: THEQU ICKBR OWNFO XJUMP SOVER THELA ZYDOG

$ python

3

vigenere.py

-

-

5

Enter the key: "helloworld

Enter the plaintext: #The quick brown fox.

Ciphertext is: ALPBI EQBMU VAYQC T

In the third example, since we didn't have enough characters to make a full group, our last group

just wont have the full amount.

Errors

$ python

3

vigenere.py

- e - d

Error: Cannot have both encrypt and decrypt mode.

$ python

3

vigenere.py

-

4

Error: Program mode was not specified. Use

-

e for encrypt and

-

d for decrypt.

$ python

3

vigenere.py

Error: Program mode was not specified. Use

-

e for encrypt and

-

d for decrypt.

$ python

3

vigenere.py

- g -

Error: You must supply an integer of at least zero with the grouping flag.

Handling user input

$ python

3

vigenere.py

-

Enter the key: Habcd

1234

Error: Keys must be at least

1

character, and consist only of alphabetic characters.

Enter the key: Habcd

Enter the plaintext: HHello, World!

Ciphertext is: Hfnoo, Xqule!

$ python

3

vigenere.py

-

Enter the key:

"

Error: Keys must be at least

1

character, and consist only of alphabetic characters.

Enter the key: Habcd

Enter the plaintext: #Hello, World!

Ciphertext is: Hfnoo, Xqule!

$ python

3

vigenere.py

-

Enter the key: Habcd

Enter the plaintext: #

Ciphertext is:

It is okay for the user to not enter a message. The key is required, though. You should keep asking

for the key until a valid one is provided by the user.

Your program will be required to both encrypt and decrypt ciphertext. The mode is specified by a

program argument flag,

-

e for encrypt mode, and

-

d for decrypt mode.

Your program should work for both upper and lowercase plaintext

/

ciphertext

/

keys

,

even if the key

and plaintext

/

ciphertext do not have the same case as eachother.

Your program should also have another option for grouping output characters together. This can be

specified by the

- g - g - e - d

Requirements The # symbol denotes user input $ python 3 vigenere.py

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