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Security aspects in mobile Bluetooth-Applications

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12/2003 – A lexande r G r im m 5. Wireless Technologies Congress Security aspects in mobile Bluetooth-Applications Dipl.-Ing.(FH) Alexander Grimm; Matsushita Electronic Marcel Holtmann; BlueZ-Project Dipl.-Ing.(FH) Andreas Vedral; FH Bochum 12/2003 – A lexande r G r im m Bluetooth-Security Bluetooth-Security Encryption and keys 12/2003 – A lexande r G r im m Balanced Encryption The base for „Balanced Encryption“ is a „shared secret“. Data Key Key Data = ⊕ ⊕ • high complexity for key distribution • simple implementation • requires sparse computing power Disadvantages Advantages 0 = ⊕ X X Y Y = ⊕0 12/2003 – A lexande r G r im m Unbalanced Encryption • keymanagment is necessary • requires high computing power • high implementation complexity • high security Disadvantages Advantages Algorithm Algorithm Data Data Pin private key public key Keyring 12/2003 – A lexande r G r im m Initialization and Combination Key • Algorithm E 21 • Parameters - two local random numbers - two BD_ADDR‘s - existing key (K Init or K AB ) • Algorithm E 22 • Parameters - PIN-Code - Length of PIN-Code - BD_ADDR of the initiator - random number Combination Key (global) Initialization Key (local) 12/2003 – A lexande r G r im m Keygeneration K RAND LK C A A ⊕ = _ random number for K Init authentication Generation of Initialization Key K Init and Combination Key K AB K RAND LK C B B ⊕ = _ cf. BT-Core 1.1 Spec. Fig. 14.2 12/2003 – A lexande r G r im m Unit Key and Master Key Unit Key K Unit This key is generated once. It will be used for devices with light memory or computing power. For the transmission K Unit is ciphered with K Init . Advantage: No additional memory is necessary! Disadvantage: Low security! Master Key K Master This key is used in networks with encrypted broadcast messages. K Master replaces temporary the connection key, if used. 12/2003 – A lexande r G r im m Bluetooth-Security Bluetooth-Security Se ...

Source: www.holtmann.org

 

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