encryption.py

print("Hello, welcome to Adriana Machado's encryption/decryption machine. What is your name?")
x = input()
print("Nice to meet you, ", x, ". I am a non-sentient machine; you can call me Arendt.")
print("Please enter in ALL CAPS any variation of the English 26-letter alphabet with no punctuation and watch the magic occur!")
y = input()



p = 13 # integer greater than or equal to 13
q = 17 # integer greater than or equal to 17
n = p * q # public key
e = 5 # public key
i = 2



def f(n):
    
    """phi function of n
    Argument: n
    Output: p*q-p-q+1"""
    
    return int((p - 1)*(q - 1))



d = int(((i * f(n)) + 1) / e) # private key



print("Your phi(n) is: ", f(n))



caps_alpha = {"A":1, "B":2, "C":3, "D":4, "E":5, "F":6, "G":7, "H":8, "I":9, "J":10, "K":11, "L":12, "M":13, "N":14, "O":15, "P":16, "Q":17, "R":18, "S":19, "T":20, "U":21, "V":22, "W":23, "X":24, "Y":25, "Z":26, " ":27}



def cypher(y):
    
    """
    For processing letters to numbers through the caps_alpha cypher. 
    
    Argument: ALL CAPS series of letters
    Output: a list of numbers corresponding to each original letter
    """
    
    l_to_n = []
    for letter in y:
        number = caps_alpha.get(letter)
        l_to_n.append(number)
    return l_to_n

cypher = cypher(y)



print("Your cypher is: ", cypher)



def c_encryption(cypher):
    
    """
    For processing the list of numbers generated by the cypher through the given encryption formula
    Argument: cypher output list of numbers
    Output: list of encrypted numbers
    """
    
    c_to_e = []
    for number in cypher:
        c = int((number**e)%n)
        c_to_e.append(c)
    return c_to_e

encryption = c_encryption(cypher)



print("Your encryption is: ", encryption)