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Generate a random password with a given problem space complexity.
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from math import ceil, log
from string import ascii_lowercase, ascii_uppercase, digits
# use system random
from random import SystemRandom
random = SystemRandom()
lookalikes = "1lI0O"
passphrase_chars = ''.join(filter(lambda a: a not in lookalikes,
ascii_lowercase + ascii_uppercase + digits))
def main():
problem_space = 192 # bits
min_digits = ceil(log(2**problem_space, len(passphrase_chars)))
passphrase = ''.join([random.choice(passphrase_chars) for i in
print("{}: {}".format(min_digits, passphrase))
if __name__ == "__main__":
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