Steganography

do it yourself

Source Code and Descriptions about Hiding Messages in

• Images and AVI-Videos
1. Part 1 - Introduction
2. Part 2 - Multiple Carrier Files
3. Part 3 - Invisible Changes
4. Part 4 - AVI Files
5. Part 5 - Regions with different Data Density
6. Part 6 - Indexed Bitmaps like GIF or PNG
• .NET Assemblies
1. Part 1 - How and Where to Hide Data
2. Part 2 - Using Key Files and more Methods
• Audio Data
1. MIDI Files
2. Wave Audio Files
3. Music Tapes
• Collections in General: GIF Palettes, HTML Attributes, Shopping Lists...
• ZIP Archives

The complete Solution

• SteganoDotNet - A Steganography Framework for .NET/mono 

These articles have been published first on , there you can find discussion forums for each one.
Here are the german translations and a few corrections.

...or are you looking for Science Fiction in german language ?