babyenc_solution.py

# a b c d e f g h 

# a^b b^c c^d d^e e^f f^g g^h

# a^c b^d c^e d^f e^g f^h

# a^b^c^d b^c^d^e c^d^e^f d^e^f^g e^f^g^h

# a^e b^f c^g d^h

# a^b^e^f b^c^f^g  c^d^g^h

data = open("out.txt", "rb").read().replace("\x0d\x0a", "\x0a")

for offset in xrange(len(data)):
    test = list("RCTF{" + data[offset:])
    
    for i in xrange(len(test)-5):
        test[i+5] = chr(ord(test[i+0]) ^ ord(test[i+1]) ^ ord(test[i+4]) ^ ord(test[i+5]))
        
    good = True
    for i in xrange(127, 256):
        if chr(i) in test:
            good = False
            break

    for i in xrange(32):
        if i in (9, 10, 13):
            continue
            
        if chr(i) in test:
            good = False
            break
            
    if good:
        print repr("".join(test))