Lesson 25: Simple encryption

Post date: May 11, 2018 3:00:50 PM

abc = "abcdefghijklmnopqrstuvwxyz !@#$%^&*()_+:?><ABCDEFGHIJKLMNOPQRSTUVWXYZ"

length = len(abc)

def position(c):

return abc.find(c)

def getkey(password):

key = 0

for c in password: key += position(c)

return key

def shift(c,x):

x = x % length

y = x + abc.find(c)

if y > length - 1: y = y % length

return abc[y]

def crypt(text, password, x):

key = getkey(password)

encryptedtext = ""

for c in text:

encryptedtext += shift(c, x * key)

return encryptedtext

text = input("Give me a text:")

password = input("Give me a password:")

secretmsg = crypt(text,password, 1)

print(secretmsg)

print(crypt(secretmsg, password, -1))