Does anyone know how to? I dont mean crackers. Its hackers I wanna talk to. Those who get it, know the difference. Whats net security all about? How do encoding/decoding algoithms work? How can you compress information and still retain the quality of it? I know avi/mpeg/vcd/wmp are all codecs which do this, but whats the theory behind it? How is it possible? I thought that the net information content is a constant, so how can you encode something, compress it, and then decode it to get all the information back?