A little python module and script that makes text much less legible by character encoding conversions and random bit flipping. The bit flipping is not deterministic so you can run it several times and get different results. Works best with languages other than English.

mojibakifier.py

# Invoke as:
#    python mojibakifier.py
# 
# For example:
#    echo "Hello" | python mojibakifier.py
#
# Todo:
#  - Flag for bit_rot

import string
import sys
import random
import os

def mojibakify(s, bit_rot = True):
	'''Takes an input string, destroys it and returns a byte object.
	'''
	b = s.encode("windows-1252", "ignore")

	def flipper(x):
		if random.randint(0, 25) < 2: 
			n = random.randint(0, 8)
			return x ^ ((3 ** n - 1) % 255)
		return x
	
	if bit_rot:
		b = bytes(map(flipper, b))

	b = b.decode("gbk", "ignore").encode("utf-8", "ignore")

	return b

if __name__ == "__main__":
	for line in sys.stdin:
		sys.stdout.buffer.write(mojibakify(line))