TinySec: A Link Layer Security Architecture for Wireless Sensor ...

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MAC • Is 4 bytes secure – Requires 2 31 tries on average to brute force a single message. – Given a 20kbps channel would take 20 months; far longer than a node lifetime. – Numerous MAC failures would give away the attacker.
MAC • Remove the CRC and group field to make room for the MAC. – Groups can be created by using different keys for the CBC. – MAC provides integrity protection making the CRC redundant – Result: MAC increases packet size by only 1 byte.
Page 1 and 2: TinySec: A Link Layer Security Arch
Page 3 and 4: Motivation • Need a secure commun
Page 5 and 6: Access Control/Message Integrity
Page 7 and 8: Confidentiality • Keep message co
Page 9 and 10: Replay Protection • Prevent a leg
Page 11 and 12: Two-teir design • Based on the Ti
Page 13: MAC • Protects the entire packet
Page 17 and 18: Initialization Vector • 8 byte IV
Page 19 and 20: Cipher • What kind of cipher shou
Page 21 and 22: Keying • Simple mechanism: use a
Page 23 and 24: Performance • Small throughput dr
Page 25 and 26: Results • Mostly effective authen

TinySec: A Link Layer Security Architecture for Wireless Sensor ...

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