Looks like real cryptography!

cbcWithoutCypher.py

import random

def encrypt(text):
    lastchar = random.randint(0,255)
    result = chr(lastchar)
    for char in text:
        lastchar ^= ord(char)
        result += chr(lastchar)
    return result

def decrypt(text):
    result = ""
    for i in range(len(text)-1, 0, -1):
        result = chr(ord(text[i]) ^ ord(text[i-1])) + result
    return result