I don't think it's wise to assess the security of a system by asking the interested parties whether or not they think it's secure. As we've done in a number of studies here in the U.S., the Brazilian voting systems should be subject to an independent security evaluation that results in a public report. If you click around Halderman's page, you'll see that he's got a paper demonstrating a number of serious attacks on the Indian EVMs which are much simpler that the machines used in most of the U.S.

not only that... Doug Tygar is no student; he's a well-respected prof. that specializes in security and privacy.