March 9/16, 2005   


   Snapshots save digital evidence
It's usually difficult to find the digital footprints and fingerprints of an intruder in the aftermath of a computer crime. Evidence from a computer's memory, where the action takes place, is nearly always gone. A system that combines snapshots of a computer's state with intruder detection techniques promises to give investigators a wealth of information.
Full story
Software organizes email by task
You can group email messages by name, date, or subject line, but not by an activity such as a particular online transaction. A mix of well-established artificial intelligence algorithms does the trick automatically.

Wire guides terahertz waves
Electromagnetic waves that are shorter than microwaves but longer than infrared light have x-ray like properties. They could be used to peer through clothing and packaging and make useful medical images of the inside the body. One of the challenges of using terahertz waves this way is channeling them to hard-to-reach places. A simple piece of wire turns out to be an effective terahertz waveguide.

TRN's How it Works Files
Pattern Recognition: computers and human communications

Briefs
Quantum crypto scheme goes one-way... Method makes double nanotubes... Material promises denser DVDs... Artificial cochlea tells tones apart... Nanotubes boost molecular devices... Avalanches up disk storage... Silicon chip laser goes continuous.



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