Encryption: Create a Python program called Encryption.py that generates and prints two lists: 1. An ordered list of the alphabet, and 2. An encrypted (shuffled) list of the alphabet. You can use “from random import randrange” to generate random indexes for shuffling the alphabet letters. Your program will ask the end user to enter an E to encrypt a string, D to decrypt a string, or X to exit looping. The user enters a string (only characters A-Z and blanks) and the program strips any leading or trailing blanks, flips the string to upper case, and performs the encryption, decryption or program exit shown below. To organize your program, you can use the user-defined functions listed below. The built in functions that you can use to validate your data and convert datatypes are: chr(), ord(), and str(). The string methods you can use are upper(), strip(), and for lists you can use the index() method. When complete, please rename your program to “Your name Lab08.py” and send it to me as an attachment in a Blackboard message.
User-defined function headers are:
createAlphabetList() creates and returns the alphabet list
createEncryptedList() creates and returns the encrypted list
printAlphabetList() void function prints the alphabet list
printEncryptedList() void function prints the encrypted list
encrypt(string) encrypts the inputted string and returns the encrypted string
decrypt(string) decrypts the inputted string and returns the decrypted string
Sample run:
Alphabet: 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
Encrypted: J Z L F I H T D B Q O R C S N E V K A Y U P X W M G
Enter 'E' to encrypt, 'D' to decrypt, or 'X' to exit: e
Enter a string to encrypt: Hello
HELLO encrypted is DIRRN
Enter 'E' to encrypt, 'D' to decrypt, or 'X' to exit: d
Enter a string to decrypt: dirrn
DIRRN decrypted is HELLO
Enter 'E' to encrypt, 'D' to decrypt, or 'X' to exit: e
Enter a string to encrypt: Programming is fun
PROGRAMMING IS FUN encrypted is EKNTKJCCBST BA HUS
Enter 'E' to encrypt, 'D' to decrypt, or 'X' to exit: d
Enter a string to decrypt: EKNTKJCCBST BA HUS
EKNTKJCCBST BA HUS decrypted is PROGRAMMING IS FUN
Enter 'E' to encrypt, 'D' to decrypt, or 'X' to exit: x
Thank you. Goodbye.
Main Algorithm:
• Call createAlphabetList() - creates the alphabet list
• Call createEncryptedList() - create the encrypted list
• Call printAlphabetList() - print the alphabet list spaced out
• Call printEncryptedList() - print this lined up underneath the alphabet list
• Using a while loop, flip choice to upper case
• validate E to encrypt, D to decrypt, or X to exit
• Using a while loop
• if E, then call encrypt(string)
• if D, then call decrypt(string)
• if X, then issue break to exit loop
• get next choice
• flip choice to upper case
• print “Thank you. Goodbye”
User-defined functions algorithms:
• createAlphabetList()
o create a list for A-Z alphabet
o use a for loop
o start with 65 (A) and loop to 90 (Z)
o return alphabet list
• createEncryptedList()
o create a list for shuffled (encrypted) alphabet
o use a for loop and randrange(0,26) to shuffle the letters
o return encrypted (shuffled) list
• printAlphabetList()
o use a for loop to print the alphabet list – use chr() to convert to character
• printEncryptedList()
o use a for loop to print the encrypted list –use chr() to convert to character
• encrypt(string)
o Initialize string to null string
o use a for loop to build the encrypted string –
o if character is not equal to “ “, then use chr() and ord()
o else assign “ “ to encrypted character
o return encrypted string
• decrypt(string)
o Initialize string to null string
o use a for loop to build the decrypted string
o if character is not equal to “ “, then use chr(), index(), and ord()
o else assign “ “ to decrypted character
o return decrypted string
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