Security for Multihop Wireless Networks

Privacy Key Management Protocols  ◾  63

communication cost efficiency in terms of authentication overhead, which less-

ens the overall complexity of the protocol. Figure 3.9 shows the authentication

mechanism of more than two N-RS with MR-BS. In this case, if N-RS

3

wants

to join the network, it will send the authentication request message to N-RS

2

, as

it is working in nontransparent mode. While sending the message, N-RS

3

will

AK

N-RS

7

N-RS

6

N-RS

4

N-RS

5

N-RS

3

N-RS

2

N-RS

1

Auth-req

(N-RS

2

)

AK

21

SS/MS

AAA Server

MR-B

S

Auth-req

Figure 3.8 Authentication of N-RS

2

with N-RS/MR-BS.

N-RS

7

N-RS

6

N-RS

4

N-RS

5

N-RS

3

MR-BS

AAA Server

SS/MS

N-RS

2

N-RS

1

Figure 3.9 Authentication of N-R ...