  Sensor networks technologies had proved their great practicability in the
real world, being just a matter of time until this kind of networks will be
standardized and used in the field. This paper presents a new approach to
secure the transmission of information in sensor networks and is based on a
combined hardware-software architecture using three components: a) a mechanism
to provide sensor authentication and secret key distribution; b) AES
symmetrical encryption algorithm with predistributed keys; and c) an attack
detection stratagem using an expert system based on the prediction of the
values provided by the sensors, followed by reducing the sensor trust
coefficient.
