Júlio da Silva Dias,  Jean Everson Martina,  Ricardo Felipe Custódio,  Daniel Santana de Freitas. 

We describe a system able to produce trusted digital signatures in electronic documents even on untrustworthy computational platforms. In our system, all signatures executed by a certain platform are recorded by a trusted third party for comparison in case of dispute. Furthermore, we propose the use of auditable code execution and time restrictions over the whole signing process, thereby collecting evidences in a number that can assure an effective implementation of the security requirement of non-repudiation.

http://www.lbd.dcc.ufmg.br:8080/colecoes/sbrc/2004/067.pdf

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