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Old 06-05-2016, 18:43
mr.exodia mr.exodia is offline
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My code for solving (see here on how to install z3py):

Code:
from z3 import *

key = BitVec('key', 64)
solve((key * key * key * key * key * key * key) == 0x90de757572b51cd3)
Output:
Code:
[key = 16721472531635646971]
0xE80E9AAC619831FB
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dila (06-05-2016), Git (06-05-2016), niculaita (06-05-2016)