Algorithm Alley. Micha Ho hi looks at the analysis of algorithms specifically at techniques where you can throw extra memory at a problem in order to increase performance or sacrifice performance in order to decrease memory requirements.

Features. Image Authentication for a Slippery New Age. Is seeing really believing anymore? Can we trust images as evidence of true events? The answer is generally "no," although image-authentication algorithms do make it possible to tell whether or not an image has been modified. Steve describes and implements a class of algorithms that makes it possible to authenticate digital images.

The BMP File Format Part 2. In last month's installment of this two-part article, David examined how the "standard" BMP file format has been implemented differently on different platforms. This month, he explains how to use the structures to read and interpret bits.