Interesting! What would you say is the main benefit you are trying to achieve compared to the simpler technique? Achieving M-of-N security without the heavy crypto of SNARKs over MPC?
I’m having trouble understanding what a “message” is here. The phrase “in each message, we keep \frac{2C}{3} nonzero encrypted rows” seems to be to imply that each voter submits a thing which has multiple rows, so each voter submits a matrix?? Also, what is “the previous message”? The previous vote published to chain? Would this mean that voters can’t publish concurrently, and if so are there DoS attacks there?