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There are a lotta devious sorts of fraud that run around stock exchanges like NYSE. Using financial trickery, orders whilst appearing legal arriving at superdot or ABS (stock and bond market electronic exchange links), can be fraudulent, so that a series of statistical and discrete processes sweep the market's incoming messages to observe and detect fraud. This is completely beyond fault tolerance... as the 5 nines are platform anymore and with proper engineering, even boundary conditions are known.
I once did a job at NASDAQ before the 1986 crash doing capacity planning for the communications front end systems CQS and MSI ( Certified Quote System... MSI ran SOES (small order execution system). All space allocations were set to be at twice (2x) the total capacity ever recorded. Well, come that october, i rang in to the computer room in connecticut to see how things were going on that black monday... and it seems that the boundary conditions that i was ordered to plan to, they were wrong... and the systems had to be shut down to clear out the queues, causing massive disruption... lesson... it was not the computers, but the methodology of defining false boundary conditions and using them as hard ground.
Frankly, i think they should be doing this E-voting thing in special trials in some places to perfect the technology, progressing it to scale, as current database technology could easily process every vote in teh whole nation between a coupla server farms, with replication server keeping integrity. Then, only after successful trials at statewide scale, should such systems then be shifted to replace the organizational/voting systems in place today.
THe systems are only as good as the full human/system organizational entity... and it seems too much trust is being placed on the hardware without concept of, as you say, corrupting possibilities accross the entire meta-system.
I love computer science, in that plato's forms really exist... that while no chair is exactly the same as any other, the meta-chair that keeps records of all chairs, can be singular, and itself substantial, (of course given the power-off insubstantiality of all that is substantial about comptuter science) DU is not much of a message board with the power out.
I do think that evoting should be linked with e-registration and passport and drivers license registration, that the country begin towards an information digital certificate guaranteeing citizen uniqueness for digital government services. Smart european governments are already a long way down this path of single instance recognition of the citizen, as without this step, the latter bits are built on a pile of sand.
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