Steganography and steganalysis - does local web sites contain “Stego” contents?

The steganography has become a great danger through development of techniques and technology, especially in the last few years. Hackers, malicious users of the Internet, cyber criminals, use it in their evil intentions and after 9/11, attacks on the United States, even terrorists use it too. In this paper the authors will present the concept of steganography and steganalysis, analyze the possibilities to use these techniques with emphasis on computer forensic and investigation, and software tools used to detect hidden data in images, audio-video files, or even plain text files. Also will be presented a preliminary results of research on local web sites about finding a “stego” content.