digital steganography & steganalysis

Yeuan Kuen LeeMay 11, 2012

http://iservice.libertytimes.com.tw/liveNews/news.php?no=634472

http://edition.cnn.com/2012/04/30/world/al-qaeda-documents-future/

http://edition.cnn.com/video/?/video/world/2012/04/30/pkg-robertson-al-qaeda-documents-combined.cnn

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=1208318

http://www.usatoday.com/tech/news/2001-02-05-binladen.htm

technical terms in steganography

• photograph, geography, biography…• cryptography

crypto + graphy ( secret + writing ) cryptography = encryption + decryptioncryptology = cryptography + cryptanalysis

• steganographystegano + graphy ( cover + writing )Steganography = embedding + extractionsteganology = steganography + steganalysis

encryptionplaintext ciphertext

encryption-key

decryptionplaintext ciphertext

decryption-key

communication channelcommunication channel

cryptanalysis

http://hk.epochtimes.com/b5/12/3/30/155158.htm

stegosaur