there some challenges, like the first stegano, where you have this binarycode, and you need to return it in a word. how do i know what binarycode is which letter?

On is Net-Force a nice binary converter try it!
Darkego.

Or maybe this site can help you.
http://nickciske.com/tools/binary.php

-Cryptodoggy

Just the "normal" 2cents added...
Learn what "type" of binary, because there are challenges in which you have to care if there are 8bit or 7bit... (7bit = because sometimes the first bit (0) is not taken into consideration) "sessions", so be careful
Whishes to bright-shadows.net Community. I like you!

ah thx - very useful links... there is even a firefox plugin with this ascii <==> binary converter...

Yeah I know, and that plugin is created by Net Force .
It has some more nice functions like MD5, sha1 hash, escape, unescape, ascii <-> hex, ascii <->Binary.