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Privacy and Security in Embedded Sensor Networks

Daniel Turner 11/18/08 CSE237a. Privacy and Security in Embedded Sensor Networks. The Problem. Capture Attacks Wireless Communication Limited Power Resource drain attack Extra message length costly Limited Resources CPU: No asymmetric crypto RAM / Flash: minimal state.

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Privacy and Security in Embedded Sensor Networks

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  1. Daniel Turner 11/18/08 CSE237a Privacy and Security in Embedded Sensor Networks

  2. The Problem Capture Attacks Wireless Communication Limited Power Resource drain attack Extra message length costly Limited Resources CPU: No asymmetric crypto RAM / Flash: minimal state

  3. Confidentiality (Encryption)‏ Block Cipher: DES, Skipjack, AES, ... Init Vector: Additional Randomness TinySec: CBC (10% pwr increase)‏ IV = 4 Bytes MiniSec: OCB (8.3% pwr increase)‏ No text expansion

  4. Authenticity (MAC)‏ MAC: cryptographic secure checksum TinySec: Replace CRC with MAC (3% pwr increase)‏ MiniSec: Instead of an IV OCB produces a MAC

  5. Additional Areas • Secure Routing • Prevent Black holes • Replay Attacks • Counters and Bloom filters • Keying • Global key • Pair wise keys • Something between

  6. Future Work Better Keying Methods Optimized Ciphers Break implicit assumptions about loose synch between nodes

  7. Questions?

  8. Key Management Bad: All pairs or Single key LEAP Keys Base-station Pair: Computed at boot from K_in Cluster: pairwise sending of cluster key Global re-keying: Controller revokes node, sends new key

  9. Replay Attacks TinySec: No protection MiniSec: Counters in unicast (3 bit overhead)‏ Bloom filter in broadcast

  10. Secure Routing Create a routing table using signed IDs Challenges: prevent liars No node duplication: prevent Sybil

  11. Secure Routing

  12. Secure Routing Create a routing table using signed IDs Challenges: prevent liars No node duplication: prevent Sybil Route via Multi-path forwarding 3 paths per group (Random) direction string Honeybee to eliminate bad nodes

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