gistfile1.py

#! /usr/bin/env python

import string

line = "uhifjuhxzxfrrevuweyoj6578chwo91tyux386c09c794l5m85p99387591890"
alphabet = string.ascii_lowercase
digits = string.digits

num = 13
str=""
for x in line:
    if x in string.ascii_lowercase:
        str += alphabet[(alphabet.index(x) + num)%len(alphabet)]
    else:
        str += digits[(digits.index(x) + num - 2)%len(digits)]
    num -= 1
    num %= len(alphabet)

print "%s://%s.%s/%s/%s/%s/%s" % (str[0:5], str[5:13], str[13:15], str[15:21], str[21:25], str[25:30], str[30:])

num=13, num_d=7. Just saying.