+    Author: Alexander Hanel 

+    Date: 20160729

+    Purpose: Searches for ngrams in a file and then uses those as an XOR key. 

+'''

+from collections import Counter

+from itertools import cycle

+from itertools import product

+

+def xor_mb(message, key):

+    '''Multi-byte XOR of a string message and string key'''

+    return''.join(chr(ord(m_byte)^ord(k_byte)) for m_byte,k_byte in zip(message, cycle(key)))

+

+

+def run():

+    data = open(sys.argv[1],'rb').read()

+    c = 0 

+    # source http://stackoverflow.com/a/25071991

+    for n in range(1, len(data)):

+        substr_counter = Counter(data[i: i+n] for i in range(len(data) - n))

+        key, count = substr_counter.most_common(1)[0]

+        if count == 1:

+                break

+        temp = xor_mb(data, key)

+        if "program" in temp:

+                print "Length: %s, Count: %s Key: %s" % (len(key), count, key)

+                f = open(str(c) + ".bin", "wb")

+                fk = open( "key-" + str(c) + ".bin", "wb")

+                f.write(temp)

+                fk.write(key)

+                f.close()

+                fk.close()

+                c +=1

+