A Steganography Scheme in P2P Network

With the extensive application of the peer-to-peer (P2P) network, the torrent file, a vital part of the BitTorrent P2P network, has become a very popular file format over the Internet. Through detailed analysis, we found that the torrent files are ideal host carriers of steganography. In this paper, we propose a steganography scheme for torrent files, in which two approaches, namely Letter Case Change (LCC) and Field Reusage (FR), are adopted to produce stego-torrent. In LCC, the insensitivity of letter case in torrent files is used to hide data. The approach doesn´t change the size of the torrent files, which allows for a high level of transparency and security. In FR, the structure redundancy of torrent files is exploited to embed information. The approach has a tremendous capacity. The flexible use of these two approaches can meet different needs. The experimental results show these methods are highly efficient and imperceptible.