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Bluetooth security modes and supported versions

Security Mode
Versions supported
No Security. Device operates in promiscuous mode allowing any other Bluetooth device to connect it
v2.0 and earlier devices support it.

v2.1 and later devices support for backward compatibility. 
Service level enforced security. Security measures are established after the channel is established. Supports Authentication, Authorization and Encryption.
v2.0 and earlier devices support it.

v2.1 and later supports for backward compatibility .
Link level enforced security. Security measures are established before the channel is established. Supports authentication and encryption.
v2.0 and earlier devices support it.

but v2.1 and later devices support for backward compatibility. 
It is a service level enforced security mode in which security procedures are initiated after link setup. Uses SSP (Secure Sample Pairing)
Mandatory for communication between v2.1 and later BR/EDR devices.

Backward compatible with any of the other three Security Modes.


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