Keys for these cryptographic operations must be set up
by communicating nodes before they can exchange information securely. A
key management scheme is to establish various cryptographic keys in a network,
and it 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. In fact, a secure key management scheme is the prerequisite for
the security of other primitives, and thus essential to achieving secure infrastructure
in sensor networks.
The primary functionality of wireless sensor networks is to sense the environment
and transmit the acquired information to base stations for further
processing. Thus, routing (data dissemination) is a fundamental and very
important operation for sensor networks. E?±cient and secure data dissemination
is challenging and critical for the successful operation of many sensor
networks. Some recent works (e.g., [3, 31]) have considered the security routing
issue in sensor networks. However, most of the proposed approaches try to
add security features to existing routing protocols. They either do not address
security very well, or dramatically degrade routing performance. Few existing
works consider security issues during the design time of the routing protocol.
Although one may add security features to existing routing protocols, the best
way is to consider security at the protocol design time [13].
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