Earlier quoted context omitted.
Regarding Indian voting machines, there is also randomization involved at various levels during distribution making it difficult to game the system but still I always wonder if there is any way to hack the system. I hope people in charge have a process to continuously evaluate the security procedures and improve it.
I never understood the desire to have any kind of machine at all. Paper ballots are a perfectly efficient and scalable system used for many large elections. Even if complicated machines are theoretically safe against malfeasance, keeping it simple increases public confidence.
The US 2000 election was a fiasco of the failures of paper ballots. Officials spent weeks scrutinizing ballots and to this day nobody thinks they got it correct to within the margin of error.
That's when electronic machines came in. They are not necessarily better, but nobody who lived through that nightmare thinks fondly of the clarity of paper ballots.