A new tool from a graduate student at the Vrije Universiteit in Amsterdam offers the first real-time cloak of protection to users concerned about security, and no hammer blows are required. The RFID Guardian is essentially a firewall that can prevent or allow RFID queries, and can do so on a per-tag basis. Melanie Rieback, the Guardian's designer, describes it as a portable, battery-powered device for personal RFID privacy—but even if you aren't concerned about men in dark sunglasses snatching your passport data, the selective jamming tech in this diminutive device is fascinating stuff.

At Ars Technica.

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