Lightweight Protocol for Trusted Spontaneous Communication 
       
    P. Blaskiewicz, M. Klonowski, M.Kutylowski, P. Syga 
         Wroclaw University of Technology       


We present a communication protocol with encryption, suitable for extremely weak
devices, which communicate only by sending unmodulated, on/off signals (beeping).
We assume severely constrained model with no coordination or synchronization between
devices, and no mechanism for message reception acknowledgement. Under these assumptions,  
we present a way to handle the problem of transmissions interference (collisions) 
and providing message secrecy at the same time.
 
In order to achieve our goals in such limited communication channel, we use
special encoding and combine encryption procedure with the communication layer
of the protocol. This is  different from the state-of-the-art-today, where an encrypted 
channel is built in the highest level of the communication protocol after assigning 
the radio channel to one of the sender devices. 

We present a real-life motivations for the proposed approach as well as rigid 
correctness and security analysis. 


INTRUST 2014