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is there a key that gives round 1 and round 0 that are equal? (a0,b0,c0,d0) = (a1,b1,c1,d1) how many keys like that exist? can it continue to round 2? round3...?

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This question would be better asked at (e.g.) StackOverflow or the CS overflow site. – Steve Huntsman Feb 11 '11 at 19:29
    
thanks, will try to do that... – dinkader Feb 12 '11 at 9:40

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