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OpenPuff Steganography and Watermarking, sometimes abbreviated OpenPuff or Puff, is a freeware steganography tool for Microsoft Windows created by Cosimo Oliboni and still maintained as independent software. The program is notable for being the first steganography tool (version 1.01 released on December 2004) that: * lets users hide data in more than a single carrier file. When hidden data are split among a set of carrier files you get a carrier chain, with no enforced hidden data theoretical size limit (256MB, 512MB, ... depending only on the implementation) * implements 3 layers of hidden data obfuscation (cryptography, whitening and encoding) * extends deniable cryptography into deniable steganography Last revision supports a wide range of carrier formats * Images Bmp, Jpg, Png, Tga * Audios Aiff, Mp3, Wav * Videos 3gp, Mp4, Mpeg I, Mpeg II, Vob * Flash-Adobe Flv, Pdf, Swf ==Use== OpenPuff is used primarily for anonymous asynchronous data sharing: * the sender hides a hidden stream inside some public available carrier files (''password'' + ''carrier files'' + ''carrier order'' are the secret key) * the receiver unhides the hidden stream knowing the secret key The advantage of steganography, over cryptography alone, is that messages do not attract attention to themselves. Plainly visible encrypted messages — no matter how unbreakable — will arouse suspicion, and may in themselves be incriminating in countries where encryption is illegal. Therefore, whereas cryptography protects the contents of a message, steganography can be said to protect both messages and communicating parties. Watermarking is the action of signing a file with an ID or copyright mark. OpenPuff does it in an invisible steganographic way, applied to any supported carrier. The invisible mark, being not password protected, is accessible by everyone (using the program).〔(Cours : stéganographie et tatouage numérique )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「OpenPuff」の詳細全文を読む スポンサード リンク
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