Implementation and efficiency of steganographic techniques in bitmapped images and embedded data survivability against lossy compression schemes
By: Daniel L. Currie III and Hannelore Campbell
Contributors: Campbell, Hannelore
Publisher: Naval Postgraduate School; Available from National Technical Information Service
Published: 1996
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Format: Electronic resource
Number of pages: 78
Subjects: Cryptography; Data compression (Computer science)
Description: The term steganography is descriptive of techniques used to covertly communicate by embedding a secret message within an overt message. Such techniques can be used to hide data within digital images with little or no visible change in the perceived appearance of the image and can be exploited to covertly export sensitive information. This thesis explores the data capacity of bitmapped image files and the feasibility of devising a coding technique which can protect embedded data from the deleterious effects of lossy compression. In its simplest form, steganography in images is accomplished by replacing the least significant bits of the pixel bytes with the data to be embedded. Since images are frequently compressed for storage or transmission, it is desirable that a steganographic technique include some form of redundancy coding to counter the errors caused by lossy compression algorithms. Specifically, the Joint Photographic Expert Group (JPEGi) compression algorithm, while producing only a small amount of visual distortion, introduces a relatively large number of errors in the bitmap data. These errors will effectively garble any noncoded steganographically embedded data.
Notes: Thesis advisor(s): Cynthia E. Irvine,  Harold Fredricksen.

"March 1996."

Thesis (M.S. in Computer Science) Naval Postgraduate School, March 1996.

Includes bibliography references (p. 37).

"Approved for public release; distribution is unlimited."-Cover.

Also available online.

Mode of access: World Wide Web.

System requirements: Adobe Acrobat Reader.

US Navy (USN) author.

dk/dk cc:9116 10/2/96.  Record updated 05/09/05.  PA