In the presence of insider adversaries, link layer security is not enough
to protect the network, since an insider has complete access to any message
routed through it and it can modify, suppress or even discard the message.
In such a case, one might not be able to provide confidentiality, integrity, authenticity,
and availability to every message. Thus, in the presence of insider
attackers, the security objective should be to ensure that the sensor network
can provide the basic functionality (i.e., performing sensing tasks and transmitting
data to the base station) with minimum degradation.
In the following, we discuss two important security issues in sensor networks
??” key management and secure routing.
4 Key Management in Sensor Networks
To achieve security in wireless sensor networks, it is important to be able to
perform various cryptographic operations, such as encryption, authentication,
etc. Keys for these cryptographic operations must be set up by communicating
nodes before they can exchange information securely. Key management
schemes are mechanisms used to establish various kinds of cryptographic keys
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Chapter 17 A Survey on Sensor Network Security
in the network, like individual keys, pairwise keys, group keys, etc. Key management
is an essential cryptographic primitive upon which other security
primitives are built. Most security requirements, such as privacy, authenticity
and integrity, can be addressed by building upon a solid key management
framework.
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