It’s not clear that this would accomplish anything, because a dedicated fraudster could theoretically transmit data over the power line.
Ultimately, there are simply too many ways to alter incoming votes AT or within the voting machine. There might be some value to providing a checksum; where all the votes are “added up” into a giant number that overflows continuously, destroying its most significant digit, but ends up with (say) a unique 6 or 8 digit number which could be compared at site “A” with (what should be) that same number at site “B”; both on a calculator-type roll of paper generated at the machine and also transmitted in a separate data packet to wherever the voting machine’s data is transmitted to.
We used to do this with PROMs. Programmable Read Only Memory. Used for machine firmware. The PROM is huge field of 8 or 16-bit numbers which were machine code for the operating software for some machine. The PROMs are “burnt” in a (what else?) PROM burner. All those 8 bit numbers are added up, which turns into a gigantic number, but the significant digits are continually thrown out. In other words, you simply add up 8,192 numbers of 8 digits each. The result is a gigantic number but you don’t care about the billions and gazillions. You just take the last 8 digits of the final number. Now you match that 8 digit number at some point with what should be that same 8 digit number at another location. Trust me, if there is *any* alteration in *any* of those 8 digit numbers of the 8,192, the checksums will not match. It will not tell you WHERE or WHAT the error(s) is/are, but will tell that something is hinky with near metaphysical accuracy.
Please forgive me for reiterating 1982 technology. But the concept is still used.
Forgiven— and fascinating explanation of the digitization still being used from so long ago. Helps one learn.
This problem not solved- it can overwhelm an obvious unquestionable landslide (even of the Electoral College votes in the targeted states- as before).