Establishing secure communication channels between devices that share no a 
priori context, also known as the device-pairing problem, is the first step 
towards the realization of mobile, interoperable applications interacting 
across several devices. One approach that promises to be both secure and 
usable relies on so-called auxiliary or out-of-band channels for 
authentication. Although many such solutions have been independently 
suggested, open, easily usable implementations are unfortunately missing so 
far. In this demonstration, we present OpenUAT, an open source toolkit for 
establishing secure ad-hoc connections. OpenUAT implements many of the 
auxiliary channels proposed in the past few years on top of a unified, common 
cryptographic protocol for key exchange and runs on a variety of mobile phones 
and desktop/laptop computers. By giving users the chance to directly compare 
different device pairing alternatives in a real-life security prototype, 
OpenUAT fosters usability research and shortens the gap between research 
prototypes and real-world applications.