Read this and come back if you have specific questions.

Hi BrowserUK, ONce again thanks for the reply. I read the tr\\\ translate info...pointed by you. I understand the simple example in there but still i cannot understand the solution provide by you. I understand that first part tr[\x00-\xff] that we want to translate the hex byte but i am unable to understand the rest of the logic. pls just explain one line if possible. Any help to explain is really appreciated. Thanks,

tr[\x00-\xff][
\x00UT\x01P\x05\x04 Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
\x00UT\x01P\x05\x04Q(\x15\x14)\x10ED\x11
];
[download]

Okay. I took your spec and coded this slow and labourious implementation and applied it to the bytes 0 .. 255:

#! perl -slw
use strict;
use Data::Dump qw[ pp ];

my %map;

for my $i ( 0 .. 255 ) {
    my @Q;
    my @D = split '', unpack 'b8', chr $i;
    $Q[ 0 ] = $D[ 0 ];
    $Q[ 1 ] = $D[ 1 ] ^ $Q[ 0 ];
    $Q[ 2 ] = $D[ 2 ] ^ $Q[ 1 ];
    $Q[ 3 ] = $D[ 3 ] ^ $Q[ 2 ];
    $Q[ 4 ] = $D[ 4 ] ^ $Q[ 3 ];
    $Q[ 5 ] = $D[ 5 ] ^ $Q[ 4 ];
    $Q[ 6 ] = $D[ 6 ] ^ $Q[ 5 ];
    $Q[ 7 ] = $D[ 7 ] ^ $Q[ 6 ];
    my $outb = ord pack 'b8', "@Q";
    $map{ $i } = $outb;
}

pp \%map;
[download]

And it produced this output:

{
  "0" => 0,
  1   => 85,
  2   => 84,
  3   => 1,
  4   => 80,
  5   => 5,
  6   => 4,
  7   => 81,
  8   => 64,
  9   => 21,
  10  => 20,
  11  => 65,
  12  => 16,
  13  => 69,
  14  => 68,
  15  => 17,
  16  => 0,
  17  => 85,
  18  => 84,
  19  => 1,
  20  => 80,
  21  => 5,
  22  => 4,
  23  => 81,
  24  => 64,
  25  => 21,
  26  => 20,
  27  => 65,
  28  => 16,
  29  => 69,
  30  => 68,
  31  => 17,
  32  => 0,
  33  => 85,
  34  => 84,
  35  => 1,
  36  => 80,
  37  => 5,
  38  => 4,
  39  => 81,
  40  => 64,
  41  => 21,
  42  => 20,
  43  => 65,
  44  => 16,
  45  => 69,
  46  => 68,
  47  => 17,
  48  => 0,
  49  => 85,
  50  => 84,
  51  => 1,
  52  => 80,
  53  => 5,
  54  => 4,
  55  => 81,
  56  => 64,
  57  => 21,
  58  => 20,
  59  => 65,
  60  => 16,
  61  => 69,
  62  => 68,
  63  => 17,
  64  => 0,
  65  => 85,
  66  => 84,
  67  => 1,
  68  => 80,
  69  => 5,
  70  => 4,
  71  => 81,
  72  => 64,
  73  => 21,
  74  => 20,
  75  => 65,
  76  => 16,
  77  => 69,
  78  => 68,
  79  => 17,
  80  => 0,
  81  => 85,
  82  => 84,
  83  => 1,
  84  => 80,
  85  => 5,
  86  => 4,
  87  => 81,
  88  => 64,
  89  => 21,
  90  => 20,
  91  => 65,
  92  => 16,
  93  => 69,
  94  => 68,
  95  => 17,
  96  => 0,
  97  => 85,
  98  => 84,
  99  => 1,
  100 => 80,
  101 => 5,
  102 => 4,
  103 => 81,
  104 => 64,
  105 => 21,
  106 => 20,
  107 => 65,
  108 => 16,
  109 => 69,
  110 => 68,
  111 => 17,
  112 => 0,
  113 => 85,
  114 => 84,
  115 => 1,
  116 => 80,
  117 => 5,
  118 => 4,
  119 => 81,
  120 => 64,
  121 => 21,
  122 => 20,
  123 => 65,
  124 => 16,
  125 => 69,
  126 => 68,
  127 => 17,
  128 => 0,
  129 => 85,
  130 => 84,
  131 => 1,
  132 => 80,
  133 => 5,
  134 => 4,
  135 => 81,
  136 => 64,
  137 => 21,
  138 => 20,
  139 => 65,
  140 => 16,
  141 => 69,
  142 => 68,
  143 => 17,
  144 => 0,
  145 => 85,
  146 => 84,
  147 => 1,
  148 => 80,
  149 => 5,
  150 => 4,
  151 => 81,
  152 => 64,
  153 => 21,
  154 => 20,
  155 => 65,
  156 => 16,
  157 => 69,
  158 => 68,
  159 => 17,
  160 => 0,
  161 => 85,
  162 => 84,
  163 => 1,
  164 => 80,
  165 => 5,
  166 => 4,
  167 => 81,
  168 => 64,
  169 => 21,
  170 => 20,
  171 => 65,
  172 => 16,
  173 => 69,
  174 => 68,
  175 => 17,
  176 => 0,
  177 => 85,
  178 => 84,
  179 => 1,
  180 => 80,
  181 => 5,
  182 => 4,
  183 => 81,
  184 => 64,
  185 => 21,
  186 => 20,
  187 => 65,
  188 => 16,
  189 => 69,
  190 => 68,
  191 => 17,
  192 => 0,
  193 => 85,
  194 => 84,
  195 => 1,
  196 => 80,
  197 => 5,
  198 => 4,
  199 => 81,
  200 => 64,
  201 => 21,
  202 => 20,
  203 => 65,
  204 => 16,
  205 => 69,
  206 => 68,
  207 => 17,
  208 => 0,
  209 => 85,
  210 => 84,
  211 => 1,
  212 => 80,
  213 => 5,
  214 => 4,
  215 => 81,
  216 => 64,
  217 => 21,
  218 => 20,
  219 => 65,
  220 => 16,
  221 => 69,
  222 => 68,
  223 => 17,
  224 => 0,
  225 => 85,
  226 => 84,
  227 => 1,
  228 => 80,
  229 => 5,
  230 => 4,
  231 => 81,
  232 => 64,
  233 => 21,
  234 => 20,
  235 => 65,
  236 => 16,
  237 => 69,
  238 => 68,
  239 => 17,
  240 => 0,
  241 => 85,
  242 => 84,
  243 => 1,
  244 => 80,
  245 => 5,
  246 => 4,
  247 => 81,
  248 => 64,
  249 => 21,
  250 => 20,
  251 => 65,
  252 => 16,
  253 => 69,
  254 => 68,
  255 => 17,
}
[download]

That's a byte to byte mapping table. I then used that to build the translation table I posted.

---

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

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