Secure communications for cluster-based ad hoc networks

using node identities

Authors: Jung-San Lee and Chin-Chen Chang

Sources: Journal of Network and Computer Applications, article in press

Reporter: Chun-Ta Li (李俊達 )

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Outline Motivation Varadharajan et al.’s scheme The proposed scheme Comments

Motivation NTDR (Near Term Digital Radio) environment

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Varadharajan et al.’s scheme Notations

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Varadharajan et al.’s scheme (cont.) Authentication phase

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Varadharajan et al.’s scheme (cont.) Communication phase (same cluster)

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mhA mhBHID1

1. mhA, HID1, T1, N1,KHID1-mhA [mhB,KS1], SIGmhA-HID1

2. mhB, HID1, T2, N2,KHID1-mhB [mhA,mhB, KS1], SIGHID1-mhB

3. mhB, HID1, T3, N2+1,KHID1-mhB [mhA,mhB, KS2], SIGmhB-HID14. HID1, mhA, KHID1-mhA [mhA,mhB,

CERTmhB, LOC{mhB}, KS2],SIGHID1-mhA, T4, N1+1

5. CERTmhA, mhB, T5, N3, KS[M], SIGmhA-mhB

6. mhB, mhA, T6, N3+1, KS[M’], SIGmhB-mhA

KS = F(KS1, KS2)

Varadharajan et al.’s scheme (cont.) Communication phase (different clusters)

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The proposed scheme Notations

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The proposed scheme (cont.) System setup

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TA MIDi

CHIDj

The proposed scheme (cont.) Authentication phase

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KMH = (CHID2j)H(T)*Ki

AUC = H(KMH)

The proposed scheme (cont.) Communication phase (same cluster and

within one hop

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The proposed scheme (cont.) Communication phase (same cluster and not

within one hop

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The proposed scheme (cont.) Communication phase (different clusters)

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Comments The encrypted message can be revealed by

clusterhead node The conference key (non-interactive)

K1

K2

K3

MID1

MID2

CHID1

K123 = (MID22)*(CHID1

2)H(T’)*K1

K123 = (MID12)*(MID2

2)H(T’)*K2

K123 = (MID12)*(CHID1

2)H(T’)*K3