lostKey.py

data = [
 "1f9111".decode("hex"),
 "1799".decode("hex"),
 "0790001226d8".decode("hex"),
 "0a9e1e5c3ada".decode("hex"),
 "1f".decode("hex"),
 "099e195e".decode("hex"),
 "0a97075a21dac1".decode("hex"),
 "0a9710".decode("hex"),
 "199e075131d3".decode("hex"),
 "1199".decode("hex"),
 "12961350".decode("hex"),
]

# only 6 letter words
data2 = [
 "0790001226d8".decode("hex"),
 "0a9e1e5c3ada".decode("hex"),
 "199e075131d3".decode("hex"),
]

l = "0a97075a21dac1".decode("hex")

def xor(c, d):
    return ''.join([chr(ord(a) ^ ord(b)) for a,b in zip(c, d[:len(c)])])

key = ''
ws6 = open('words6.txt', 'rb').read().lower().splitlines()
ws7 = open('words7.txt', 'rb').read().lower().splitlines()
for w in ws7:
    k = xor(w, l)

    cnt = 0
    for w6 in data2:
        de = xor(w6, k)
        if de.lower() in ws6:
            cnt += 1
            print de, cnt

    if cnt > 1:
        key = k
        break

msg = []
for x in data:
    de = xor(x, key)
    msg.append(de)

print ' '.join(msg)
print key.encode('hex')