"There is a dog called Danbi  who lives with beist. She is actually one of the evil. She looks like an angel when she is sleeping. Her secret mission from the evil group is to make beist to be not around his work laptop. But this time, she is just angry because she is so hungry and beist is deeply sleeping. Now, she did bite his nose twice. And she did bite the beist's challenge for many times. So, the binary is probably sort of messed up. You can't open it with IDA, GDB and so on. Now, beist has no idea know how to recover the binary and solve the challenge. Help beist! The goal is to read key.txt file."   [Binary URL]: http://war.secuinside.com/files/angry_danbi   [Server info]: (The info here actually doesn't matter when you try to solve this challenge. But we're trying to be kind.)       - $ uname -a         Linux localhost.localdomain 2.6.32-279.14.1.el6.i686 #1 SMP Tue Nov 6 21:05:14 UTC 2012 i686 i686 i386 GNU/Linux       - $ ls -al         -rwxr-xr-x 1 root root 13908 2013-05-25 22:22 angry_danbi         -rw-rw-r-- 1 danbi danbi 20 2013-05-25 22:23 banner.txt         -rw-rw-r-- 1 root root 15 2013-05-24 18:03 key.txt         -rw-rw-r-- 1 root root 8 2013-05-24 18:02 secret       - IP address: 218.54.30.167, 218.54.30.185                               (You can choose one of them. We just have 2 servers just in case of too many players. Try other server if one is down.)       - Port: 8080       (This photo doesn't have any hint for the challenge. Don't do "forensics/stegano" stuff)