Security for Multihop Wireless Networks

482  ◾  Security for Multihop Wireless Networks

secure communication channel. Various types of security metrics are defined as

follows:

1. SymEK (A, msg): Node A performs symmetric key encryption with key K for

the message msg.

2. AsymEK (A, msg, Kp): Node A performs asymmetric key encryption with

public key K and private key K

p

for the message msg.

3. DSignatureKC (A,msg): Digital signature by the node A using key certificate KC.

4. EK1 (EK2 (A, msg)): Hierarchical networks use multilayer encryptions. Node

A initially (level 1) encrypts the message msg using the key K1. e message is

further encrypted in the second hierarchical level using the key K2.

18.3.2 Trust Metrics

e degree of interaction between two nodes is a function of the deg ...