With these words this challenge starts. We can download a gzipped archive which contains the plain text version of war and peace. So we extract this file. At google we find another plain text version of this book. Now we can compare both files, but this surprises us. Both files are completely the same.

Therefore we have to take a closer look at the archive file. At the first glance we cannot find any abnormalities. So we create a new archived version of the book and compare each other. Now we see that almost every byte is different. Ok, we know now that some information is possibly hidden in this archive file. The organizer gives us a little hint with one word - gzsteg.

A search with google shows us that gzsteg is an old steganography addition for gzip by Andy Brown and Ken Pizzini. We only find patches for the sources of gzip. So we try to patch the current version of gzip, but this fails. Therefore we download the version 1.2.4. Patching this sources causes no problems. After compiling the sources we have a gzip binary which can extract hidden files in gzipped archives. Ok, lets go.

gunzip -s hidden WarandPeace.tar.gz

Now we have another file. The file command shows us that this file is a text file, too. This file contains a little commercial text, but we don't know what we have to do with this text.

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We feed google with the first line of this text and find some information about hidden messages in commercials and a link to a website which can extract this messages. We paste the commercial text into the textfield from this site and get the hidden message and the containing flag.

Your flag is H564FD06941E352A453CA46346DD56701940