What an intriguing question. If you have legitimate access to powerful hardware then there is nothing in the rules to forbid you using it (though maybe we should think of making one!) but it is probably not the way to win the competition as the prize committee will be looking for evidence of ingenuity and insight in the solution, not brute force. So, if you are just keen to flex your hardware muscles go ahead and see how you get on, but if you want to impress us then maybe concentrate on your ability to analyse the ciphers with the aid of more standard equipment and see what happens! Harry