Wognsen, Erik, Henrik Søndberg Karlsen, Marcus Calverley, Mikkel Normann Follin, Bent Thompsen, and Hans Hüttel.
" A Secure Relay Protocol for Door Access Control." <em>Proceedings of the 12th Brazilian Symposium on Information and Computational Systems Security,
Curitiba, 2012</em>. SBC, 2012,  
pp.196-209.