A crypt-analyst has devised a way to send a message using a method that entirely

Question

A crypt-analyst has devised a way to send a message using a method

that entirely obscures the message from the enemy.

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A text of words coming from what appears to be an article written in

an old newspaper, is held by both the sender and the receiver of the

message.

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We’ll call this text message:

text.txt

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The sender adds a few key words to text.txt (these few key words are

the secret coded message that the sender wants the receiver to

receive). These key words are inserted in such a way as they are not

obvious to the reader (the interceptor) of the message.

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We’ll call this text message:

cryptext.txt

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By taking the difference between the set of the two messages, the

receiver can filter out all but the intended secret message that (s)he is

supposed to receive.

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Write a program that will reveal the intended secret message.

The assignment should be coded in python. The chapter was going over sets, so I assume using sets will be helpful in solving this problem.

Take your result, and sort it so the message is in alphabetical order.

Explanation / Answer

# ENCODE a secret message # Scramble the alphabet, read a secret message, encode it, print scrambled import random def main(): encryption() decryption() def encryption(): encrypt=["*"]*26 # all letters available print(encrypt) print("Alphabet: ", end="") for numbah in range(26): #converts numbah into a letter letter = chr(numbah+65) # converts 0-25 --> 'A' = 'Z' print(letter, end="") #Reminder: find an empty position for that letter to be placed notfound = True while notfound: possible_position = random.randint(0,25) if encrypt[possible_position] == "*": notfound = False encrypt[possible_position] = letter print(" Scrambled: " , end="") for numbah in range(26): print(encrypt[numbah], end="") print(" ") msg=input("Now, please type your secret message to encode: ") print("Your secret message: " + msg) print("Your message encoded: ", end="") # reminder non alphabetic characters should 'float thru' unchanged! for alpha in msg.upper(): if alpha < "A" or alpha > "Z": print(alpha, end="") else: print( encrypt[ ord(alpha) - 65], end="") print(" ") def decryption(): scram_alph = input("Input the scrambled alphabet from the early prog: ") scram_mess = input("Input the scrambled messgae you want decoded: ")

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