[MPlayer-dev-eng] i need help - transformation matrix

[Fabian Franz]

Am Montag, 26. August 2002 21:21 schrieb Arpi:
> Hi,
>
> > How about doing the same 000, 111, ... 0 1 2 3, with nibbles now to
> > quicker guess the code ... ?!
>
> yes we did it already:
>
>  63 22 44 90  4 81  6 31 86 58 36 11 68 39 73 53
>  69 57 18 88 34 71  1 23 46 94 54 27 75 50 30  7
>  70 92 20 74 10 37 85 13 56 41 87 65  2 59 24 47
>  79 93 29 89 52 15 26 95 40 17  9 45 60 76 62  0
>  64 43 66 83 12 16 32 21 72 14 35 28 61 80 78 48
>  77  5 82 67 84 38  8 42 19 51  3 91 33 49 25 55
>
> > PS: Are we talking abuot a mathematical matrix or just seeing the 11
> > CRC-sums as one table, which is called matrix, and on which certain
> > operations are done to transform it ...
>
> just table, or sequence of numbers
> and even its width/height is not sure just a guess
>
> we have 96 numbers reordered and we should find the reordering algo
> (or teh algo generating the above number table)

thx ...

>
> anyway it's a bidirectional transformation, ie. the coding and decoding
> matrix is the same, so map[map[x]]==x
> look at teh above table, the x'th number is just the position of x in the
> table. for example, the 0th byte is 63, and teh 63th byte is 0.
>
> > PPS: Docs to this term available ?!
>
> no :(
> why the hell would we do RE if there are docs??

i meant for the term of reverse-engineering, finding matrixes, algos and so on 
...

I did not find infos on that ...

cu

Fabian