Since only characters are involved you can use tr///: 

while (<$in>) {
   tr/\x00\x17\x4E\x42\x24\x90/\x17\x00\x42\x4E\x90\x24/;
   print $out $_;
}

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In reply to Re^3: Binary conditionals by jwkrahn
in thread Binary conditionals by bunnym4n

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