问如何加密字符串，然后将其转换回原始状态？

EN

import string
from random import *
import pyperclip

characters = string.ascii_letters + string.punctuation  + string.digits
password =  "".join(choice(characters) for x in range(randint(16, 32)))

def mess_up_pass(password):
    messed = password
    # This is where I am trying to encrypt or ‘mess up' the password

def get_orig(messed):
    # This is where I would like to take the messed up password and spit out the original form
    return # ???

with open('pass.txt', 'a') as x:
    x.write("\n")
    x.write(input("What is the service? ") + ": ")
    x.write(" " + password)
    x.write("\n")