Table 2.

Enhancements for Bluetooth Security.

Ref.	Protocol	Attack Manipulation
[77]	BTCP	-Protocol to Secure Scatternet Formation -Efficient Against MITM Attack
[78]	RAP-BE	-Combined encrypted key exchange protocols -Efficient Against DoS and Relay Attacks
[79]	SEBSPP	-Utilized strong public key exchange mechanism to Mitigate MITM
[80]	SSBC	-Implements double layered encryption to secure data communications -Efficient Against MITM and Passive Eavesdropping Attacks
[81]	PBBPP	-Analysis of the shortcomings of Pin-Based Authentication Model -Handles Password Guessing Attack
[82]	ESBN	-Developed Link Layer Security Mechanism -Battle against MITM and Message Alterations
[83]	PUF-AP	-Physical Unclonable Function (PUF)-based authentication protocol -Joint authentication and maintenance of secrecy for the session key -MITM, Replay, Passive Eavesdropping, and Impersonation Attacks
[84]	BC-GW	-Blockchain-enabled IoT gateway for BLE-based devices -Preserve user privacy and enforce user preferences when accessing IoT devices