A new ssn generator

ssn2.py

 # SSNPad.py - creates a SSN scratch pad.  This is used to map one SSN value to 
# a random replacement value.  Useful to protect a SSN number while preserving
# the format of the data.  Reasonably secure if the scratch pad is kept secure.

# This script creates a text file with the following structure:
# XXXXXXXXX|YYYYYYYYY
# where XXXXXXXXX is the source SSN and 
# YYYYYYYYY is a psuedo(semi)-random alternate SSN

# Sample:

# SSN numbers are composed of three parts:
# AAA-GG-IIII
# AAA = The Area (used to map to a state, doesn't anymore)
# GG = Group 01-99
# IIII a zero padded number between 0001-9999

# This process takes a specific source Area and Group (i.e. 123-45) and maps it
# to a randomly chosen different replacement Area and Group (i.e. 763-22) and 
# then generates a random replacement ID for each source ID.

# A sample of the output:  
# 001010001|686075132
# 001010002|686074919
# 001010003|686077114
# 001010004|686078786

import random
from itertools import product 

G_SIZE = len(range(1, 899 +1)) * len(range(1, 99+1))
ID_SIZE = len(range(1, 9999+1))

def ssn_str(agid):
    (area, group), id = agid
    return "{0:0>3}{1:0>2}{2:0>4}".format(area, group, id)

def ssn_pair(ssns):
    ssn_a, ssn_b = ssns
    return "|".join((ssn_str(ssn_a), 
                     ssn_str(ssn_b)))

def gen_groups():
    return product(range(1, 899 + 1), range(1, 99+1))

master_groups = gen_groups()
random_groups = list(gen_groups())
random.shuffle(random_groups)

master_ids = range(1, ID_SIZE+1)
random_ids = random.sample(range(1, ID_SIZE+1), ID_SIZE)

ssn_pairs = map(ssn_pair, zip(product(master_groups, master_ids), 
                              product(random_groups, random_ids)))

for pair in ssn_pairs:
    print(pair)