(ste-g&n-o´gr&-fē) (n.) The art and science of hiding information by embedding messages within other, seemingly harmless messages. Steganography works by replacing bits of useless or unused data in regular computer files (such as graphics, sound, text, HTML, or even floppy disks ) with bits of different, invisible information. This hidden information can be plain text, cipher text, or even images.
Steganography sometimes is used when encryption is not permitted. Or, more commonly, steganography is used to supplement encryption. An encrypted file may still hide information using steganography, so even if the encrypted file is deciphered, the hidden message is not seen.
Special software is needed for steganography, and there are freeware versions available at any good download site.
Steganography (literally meaning covered writing) dates back to ancient Greece, where common practices consisted of etching messages in wooden tablets and covering them with wax, and tattooing a shaved messenger’s head, letting his hair grow back, then shaving it again when he arrived at his contact point.
- stereoscopic imaging
Also called stereoscopy or 3D imaging stereoscopic imaging is a technique used to record and display 3D (three dimensional) images or an illusion of depth in an image. Stereoscopic images provide spatial information that trick a user’s brain into believing and seeing depth in the images.
- stereophonic sound
Commonly called stereo sound or just stereo, stereophonic sound divides sounds across two channels (recorded on two separate sources) then the recorded sounds are mixed so that some elements are channeled to the left and others to the right. Stereophonic sound is generally considered the best sound technology of the 1950 and early 1960’s. Contrast […]
(adj.) When used in terms of a Web site, sticky refers to a site��s ability to keep visitors on the site once they have navigated there or encourage the visitor to return frequently (i.e., the visitors “stick” to the site). A site��s stickiness depends on the content of the site that encourages the visitors to […]
(n.) Short for static friction, a condition in which a hard disk drive’s read/write heads become stuck to the disk��s platters with enough strength to keep the platters from spinning, resulting in hard drive failure. When a computer is turned off, its hard drive’s read/write heads park on the platter’s landing zones. Under normal circumstances, […]
- still frame
A single captured frame within a video file. Video editing programs will provide options for authors to grab a single image (still frame) from within a video clip. These can be used like any still photo. Authors can also use a single still frame in their video by inserting the still frame into the clip […]