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BLE Encryption

  • Algorithmus: AES-CCM
  • Key Size: 128 bit
  • Mode: Counter with CBC-MAC

Key Hierarchy​

LTK (Long Term Key)
  └── Session Key
        └── Encrypted Link

Bekannte Schwächen​

  • KNOB: Key Entropy Reduction
  • BLESA: Reconnection Spoofing