SWRA846 July   2025 CC2642R-Q1

 

  1.   1
  2.   Abstract
  3. 1Analysis of Bluetooth Pairing Technology Principles
    1. 1.1 LE Legacy Pairing and LE Secure Connections Pairing
    2. 1.2 Analysis of Association Mode Security Characteristics
    3. 1.3 Privacy Protection and Address Management
  4. 2Common Issues in Pairing Encryption
    1. 2.1 Integrity Check Fault—MIC Verification Failure (MIC failure)
    2. 2.2 Abnormal Key Negotiation—DHKey Verification Failure (DHKey check fail)
    3. 2.3 Key Management Defect—PIN/Key Loss (PIN or Key missing)
      1. 2.3.1 Key Missing During Pairing Phase
      2. 2.3.2 LTK Missing During Encryption Phase
  5. 3A Solution for Encryption Resource Conflicts
    1. 3.1 Environment Selection and Configuration
    2. 3.2 Implementing AES-256 Encryption and Decryption Using TinyAES Library
    3. 3.3 System-Level Optimization Exploration
      1. 3.3.1 Memory Allocation Inspection
      2. 3.3.2 Padding Processing and Thread Safety
  6. 4Conclusion
  7. 5References

1 Analysis of Bluetooth Pairing Technology Principles

Device pairing in Bluetooth Low Energy technology is the core mechanism for building secure communication channels, the essence of which lies in establishing a defense system against unauthorized eavesdropping of wireless signals through encrypted links. In an open wireless communication environment, data packets transmitted by Bluetooth devices carry an inherent risk of interception by nearby unauthorized devices. Although signal interception at the physical layer is difficult to completely eliminate, the application of cryptographic algorithms can effectively guarantee the confidentiality of data content. The implementation of this security mechanism relies on the negotiation and exchange of key materials by both communication parties during the initial interaction stage, which is precisely the core value of the pairing process—it not only requires coordination to generate session keys for data encryption, but also mutual determination of security parameters such as encryption algorithms and key lengths.