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How Encryption Works in Bluetooth low energy
Data encryption is used to prevent passive and active—man-in-the-middle (MITM) — eavesdropping attacks on a Bluetooth low energy link. Encryption is the means to make the data unintelligible to all but the Bluetooth master and slave devices forming a link. Eavesdropping attacks are directed on the over-the-air transmissions between the Bluetooth low energy devices, so data encryption is accomplished prior to transmission using a shared, secret key.
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