Module Nine - Steganography Highline Community College Seattle University University of Washington in conjunction with the National Science Foundation.

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Presentation transcript:

Module Nine - Steganography Highline Community College Seattle University University of Washington in conjunction with the National Science Foundation

Definition of Steganography Steganography is the art and science of writing hidden messages in such a way that no one apart from the intended recipient knows of the existence of the message; this is in contrast to cryptography, where the existence of the message is clear, but the meaning is obscured.

Steg defined The name comes from Johannes Trithemius's Steganographia: a treatise on cryptography and steganography disguised as a book on black magic, and is Greek for "hidden writing." Read more here

Uses of Steganography Watermarking of digital art Other data Data hiding Labels

Basics of Data Hiding Carrier file graphic or other document graphic or other document used to hide the confidential document used to hide the confidential document Hidden file Students can hide a document in a graphic and then hide that graphic in another graphic

Steg tools Truly good steganography tools do not change the size of the carrier file The forensic hash value, however, will change

Finding Hidden Data Your first clue will be the discovery of steganography tools Another clue may be two graphic files of different sizes or different file types It may or may not be password protected It may or may not be encrypted

Feasibility Finding items in files is time consuming Tools such as stegdetect may find them It currently will undo the following techniques jsteg, jsteg, jphide (unix and windows), jphide (unix and windows), invisible secrets, invisible secrets, outguess 01.3b, outguess 01.3b, F5 (header analysis), F5 (header analysis), appendX and camouflage appendX and camouflage

Stegspy hunter.com/stegspydownload.htm hunter.com/stegspydownload.htm Finds items using these methods Hiderman Hiderman JPHideandSeek JPHideandSeek Masker Masker JPegX JPegX Invisible Secrets Invisible Secrets

Other sources ganography/steganalysis.htm ganography/steganalysis.htm /info.html /info.html