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.

Embedded Systems. Above-Real-Time Training and the Hyper-Time Algorithm. The hyper-time algorithm lets you alter the flow of "simulated time" to benefit users-slower than real time can be used for novice users while faster than real time can be used for experts or persons "time surfing" over uninteresting portions of information. Applying the algorithm to "Above-Real-Time Training" also improves human performance, increases retention training-device effectiveness decreases stress.