Brazil had some events like this but all of them were façades. They are designed to validate the decision to deploy electronic voting machines and nothing else

Brazil had some events like this but all of them were façades. They are designed to validate the decision to deploy electronic voting machines and nothing else so only a carefully selected group of people will be invited, there will an impossible time limit and machines should be handled like black boxes (they were not considering some group stealing a voting machine in order to study it). At one particular event[1] an engineer detected RF noise leaking from the keyboard (Van Eck Phreaking) but the government dismissed it as not being a practical attack. In a country where politicians literally buy votes in poor regions, vote secrecy is a big concern. [1] http://pcworld.com.br/noticias/2009/11/23/perito-quebra-sigilo-em-urna-eletronica-do-brasil/ http://pcworld.com.br/noticias/2009/11/23/perito-quebra-sigi... (in Portuguese, sorry)