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Google Online Security Blog: Advisory: Security Issue with Bluetooth Low Energy (BLE) Titan Security Keys

We’ve become aware of an issue that affects the Bluetooth Low Energy (BLE) version of the Titan Security Key available in the U.S. and are providing users with the immediate steps they need to take to protect themselves and to receive a free replacement key. This bug affects Bluetooth pairing only, so non-Bluetooth security keys are not affected. Current users of Bluetooth Titan Security Keys should continue to use their existing keys while waiting for a replacement, since security keys provide the strongest protection against phishing.