Python-сообщество

In [1]: import random

In [2]: a = 'this is a test'

In [3]: b = [random.choice((0,1,)) for c in a]

In [4]: b
Out[4]: [0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 0]

def b1(n):
    return "01"[n%2]

def b2(n):
    return b1(n>>1)+b1(n)

def b3(n):
    return b2(n>>2)+b2(n)

def b4(n):
    return b3(n>>4)+b3(n)

bytes = [ b4(n) for n in range(256)]
def binstring(s):
    return ''.join(bytes[ord(c)] for c in s)