def decrypt(cipher, polybius, keyword):
untrans = untranspose(cipher, keyword)
trans = {}
for (val, key) in zip(polybius, itertools.product("ADFGX", repeat=2)):
key = key[0] + key[1]
trans[key] = val
groups = [untrans[2*i:2*i+2] for i in range(len(untrans) / 2)]
return "".join([trans[g] for g in groups])
def decrypt(cipher, key1, key2):
return untranspose(untranspose(cipher, key2), key1)
