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:

<Reveal this spoiler or all in this thread>

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

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