This work falls within the context of security in wireless sensor networks.
The aim of this work is to realize applications based on security
mechanisms already present in the literature, trying to improve them where possible.
The first part of this work concerns an authentication mechanism based
on a password system realized as hierarchical multilevel one-way chain.
This model makes possible the key derivation mechanism allowing subjects
to transform the keys in lower privilege keys independently, avoiding a
centralized password manager.
This application considers active subjects and a passive object.
A subject can access the object only if he owns a password matching one
of the password associated with the object.
The second part of this work concerns a protection mechanism of
distributed storage, in which a node can access a remote segment allocated
in the primary memory of another node presenting a gate that grants an access
right for that segment.
The nodes form a wireless sensor network, in which they cooperate
in monitoring an environmental parameter.
Finally, those applications have been tested and evaluated.