Archive for January, 2012
File format reverse engineering – Redux
by nada on Jan.27, 2012, under Hacks, Software
I was contacted by a visitor of this site asking for the following:
‘I read your nice article on file format reverse engineering and was wondering if you could give me a small tip / hint about compression / encryption. I am trying to understand a constant size file format and need to know if by any chance the file is compressed or encrypted in a simpler way, which leaves hope in cracking it.
…
In the case you would like to have a look at the files, I generated 2 pairs. The first file pair differs only in that one variable. The second file’s name and caption are set to “;1″;, the file 2b to “;1111111…”; (31 chars)’
As the reader seeked advice on how to proceed further and provided enough information to investigate the problem, I took a look. (continue reading…)
