Glossary

Access Control List (ACL): a list or database on a server that contains permissions for specific users to access specific services or files
Algorithm: any set of instructions or rules for solving problems
Alternate Data Streams: a feature specific to Windows operating systems in which hidden files containing attribute information are attached to standard files. This feature was developed for cross-platform support of Macintosh files, which have a data fork and resource fork associated with any particular file.
American Registry for Internet Numbers (ARIN): a web site run by a nonprofit organization that registers IP numbers and allows one to determine what organizations own specific IP address ranges (www.arin.net)

Binary: the base two numeral system in which numbers are represented strictly by 1 s and 0 s
Bitmap (BMP): the standardized digital image file format that consists of grids of pixels. Each pixel stores a numerical value that represents a color, and these pixels are combined to render the picture. Examples of types of BMP files are GIF and JPEG.

Carrier: the vessel in which a payload, or secret message, is hidden. In the case of steganography, it is described in electronic format; namely, digital image and audio files. However, it can actually be anything that can hold information.
Checksum: A mathematical value that typically serves as a way to detect errors in data through a redundancy check (see cyclic redundancy check)
Cipher: a coded message
Color Buddies: in digital image steganography, a term used to...

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