1. Protocol for Hiding Movement of Mobile Nodes in Mobile IPv6 draft-qiu-mip6-hiding-movement-00.txt F. BAO, R. DENG, J. Kempf, Y. QIU and J.Y ZHOU

2. Objectives and Assumption Objectives –Thwart movement tracing of a mobile node by eavesdroppers –Backward compatible with the base MIPv6 Assumption –The communication link between a MN and its HA is protected via a secure tunnel

3. The Basic Idea Home Net Or Foreign Net 0 Internet Foreign Net m Foreign Net 1 CN HoA HoA m HoA 1 No change to RR protocol message format Eavesdroppers can only track the 1 st move of MN by monitoring HoA Foreign Net 2 HoA 2

4. BU Messages & BU Caches BU Messages BU = {CoA m, CN, HoA m-1, seq# m, i m, j m, MAC m } (1) and HoA m = (Prefix of CoA m ) | (Hash(k m | HoA) ) (2) (64 bits) (64 bits) where m=1, 2, 3, … …, and HoA 0 = HoA (real) BU Caches Cache in CN HoA m (as index) k m (BU key) HoA CoA m …… Cache in MN HoA m k m (BU Key) CN HoA CoA m ……

5. IP Packets between MN -- CN The Idea – to hide the relation among HoA m, CoA m and CN Packets from MN to CN PKT’ = {CoA m ’, CN, HoA m, payload} (3) where CoA m ’ = (Prefix of CoA m ) | (Interface of CoA m  k’) (4) (64 bits) (64 bits) k’ = Hash( k m | 0 ) (5) Packets from CN to MN PKT” = {CN m ”, CoA, HoA m, payload} (6) where CN m ’ = (Prefix of CN) | (Interface of CN  k”) (7) (64 bits) (64 bits) k” = Hash( k m | 1 ) (8)

6. Benefits Hide the relationship among HoA, CoA and CN No change to RR protocol No change to BU message format No change to IP packet No introduction of any third party servers