Originally Posted by Hannibal1471
To go trough all possibilities would take a long long time...
But who says the keys wouldn't be found during the first days?
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I think a possibility is to calculate the keys, not bruteforce it it's just timewasting.
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AES permits the use of 256-bit keys. Breaking a symmetric 256-bit key by brute force requires 2128 times more computational power than a 128-bit key. A device that could check a billion billion (1018) AES keys per second (if such a device could ever be made - as of 2012, supercomputers have computing capacities of 20 Peta-FLOPS, see Titan. So 50 supercomputers would be required to process (1018) operations per second) would in theory require about 3×1051 years to exhaust the 256-bit key space.
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source:
http://en.wikipedia.org/wiki/Brute-force_attack
Goodluck.