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bluetooth_security.md

Bluetooth security cheat sheet

BR/EDR

Security Mode Level 1 Level 2 Level 3 Level 4
Mode 1
(no security)		 No authentication
No encryption		 N/A N/A N/A
Mode 2
(service-level security)		 No authentication
No encryption		 Authentication
No encryption		 Authentication
Encryption		 N/A
Mode 3
(link-level security)		 Authentication
Encryption		 N/A N/A N/A
Mode 4
(SSP-based service-level security)		 N/A Unauthenticated pairing (no MITM protection)
Encryption		 Authenticated pairing (MITM protection)
Encryption		 Authenticated pairing (MITM protection)
Encryption
Secure connections

LE

Security Mode Level 1 Level 2 Level 3 Level 4
Mode 1
(encryption-based security)		 No authentication
No encryption		 Unauthenticated legacy pairing (no MITM protection)
Encryption		 Authenticated legacy pairing (MITM protection)
Encryption		 Authenticated pairing (MITM protection)
Encryption
Secure Connections
Mode 2
(signing-based security)		 Unauthenticated legacy pairing (no MITM protection)
Data signing		 Authenticated legacy pairing (MITM protection)
Data signing		 N/A N/A
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