Denoising and the active warden

Steganalysis is the art and science of detecting hidden information. Within steganalysis there are two fundamentally different methods of defeating steganography, known as the passive and active wardens. Within the context of steganography, the most commonly researched area is the passive warden. The passive warden analyzes all messages with the intent of detecting the presence of steganography. The active warden modifies messages with the intent of destroying steganography. The active warden is an equally challenging topic, given the need for the removal of steganography to remain secret. In this paper we present the problem of the active warden and explore the application of various denoising techniques in a study in defeating steganography through active methods.