298 ◾ Security for Multihop Wireless Networks
can be employed as a security layer to enhance the probability of detecting more
sophisticated anomalies.
11.3 Limitations and Future Directions
In the previous section, we reviewed several anomaly-detection schemes in WSNs.
We now sum up major limitations in existing schemes and then describe some
potential future research directions.
11.3.1 Limitations
On the basis of the schemes we reviewed in the last section, we realized that exist-
ing schemes have several shortcomings. Below we highlight a few major limitations
in existing schemes.
◾ One of the basic focuses of application developers for WSNs is to optimally
utilize energy budget of nodes. e same principal applies for anomaly-detec-
tion schemes. ...