Bluetooth current security system good noise cancelling headphones

Security Mechanism

(1) Using FHSS technology, the secondary Bluetooth communication can resist the interference of similar electromagnetic waves

(2) Use encryption technology to provide data confidentiality services; 

(3) Use an identity authentication mechanism to ensure data transmission between reliable communication entities. www.bjbjaudio.com  

The Bluetooth specification defines 3 security modes that encompass device functions and applications:

(1) Not safe. Information security management is not employed and security protection and processing are not performed. It is not authenticated by link layer security functions.

(2) Business layer security. The Bluetooth device adopts information security management and performs security protection and processing. This security mechanism is established in the Logical Link Control and Adaptation Protocol (L2CAP) and the above protocols. This mode can define security levels for devices and services.

(3) Link layer security. Bluetooth devices use information security management and perform security protection and processing. This security mechanism is built into the chip and link management protocol (LMP). www.bjbjaudio.com

Authentication attack

Authentication is based on the sharing of public link keys between devices. If the link key is the default key, then every communication depends on the PIN PIN is a 4-digit number, making the key space only 10,000 values ​​at most, and it is easy for an attacker to crack the PIN using exhaustive methods. If the link key is generated from the device key, the attacker can use the obtained PIN to impersonate the attack. In the scheme using the device key as the link key, if device A communicates with device B and then communicates with device C, assuming that A and C use A's device key, and both use the same key as B, then At this point all three devices use the same key and are able to impersonate each other. www.bjbjaudio.com

encryption attack 

This attack is based on a PIN flaw. In the process of establishing the link key, the network intruder first intercepts the data packets in the first handshake process, in order to calculate various parameters including the link key, so as to carry out a brute force attack on the PIN. Another attack is the use of encryption algorithms. The link-level encryption algorithm adopts stream cipher series algorithms EOE1, E21E22 and E3. This algorithm encryption is not only fast, but also easy to implement in hardware. www.bjbjaudio.com

communication attack

Communication attacks are also known as "impersonation". This attack first scans and records the mobile identification number (MIN) and electronic serial number (ESN) of valid users, and the attacker makes a call through the MIN and ESN to notify those who have not yet caused the Suspect users. In the Bluetooth specification, there are three places in the data frame to be edited. Forged www.bjbjaudio.com/ with these modifications