Security for Multihop Wireless Networks

Defenses against Packet-Dropping Attacks  ◾  387

the intermediate nodes will be incremented. If no acknowledgment is received, the

intermediate node’s level will be decremented. If the fidelity value of a given node

reaches zero value, it will be labeled as malicious. e main drawback of this solu-

tion is the processing delay introduced in the network.

e authors in [36] complete their previous works in [31] and [32] by suggest-

ing a modular solution that employs two-hop cryptographic acknowledgments for

unicast packets, while a passive feedback mechanism to monitor broadcast packets

is also employed. e gathered information is afterwards used as the basis for an

accusation-based collaborative mechanism to detect dropping attacks.

e main ide ...