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Fox‑IT has extracted AES-256 encryption keys using $200 of standard electronics parts to measure electromagnetic radiation. At a distance of one metre sniffing the keys over the air took five minutes. At 30cm the extraction time is cut down to just 50 seconds. By using a test rig for calibration they mapped out power consumption related to individual bytes, resulting in 8192 guesses at the encryption key. They said (PDF) their technique is suitable for attacking network encryption appliances.