Expert commentary on Internet voting:
...there is no way to reconcile electronic images of ballots received with the version the voter intended to send. In other words, it is impossible to know if voter choices have been tampered with somewhere between the voter's computer and election official's machine, thereby making it virtually impossible to confirm an attack on an online election system.
AK-Sen: will we ever know who really won this close race?
...Alaska now permits all voters to vote over the Internet. ... Alaska's State Election Division ... website: "When returning the ballot through the secure online voting solution, your are [sic] voluntarily waving [sic] your right to a secret ballot and are assuming the risk that a faulty transmission may occur."
Actual risks are much broader:
...There are countless ways ballots cast over the Internet can be hacked and modified by cyber criminals. The National Institute of Standards and Technology, at the direction of Congress, has conducted extensive research into Internet voting in the last decade and published several reports that outline all the ways votes sent over the Internet can be manipulated without detection. After warning that there are many possible attacks that could have an undiscovered large-scale impact, the institute concluded that secure Internet voting is not yet achievable.
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Barbara Simons is chair of the Board of Directors of Verified Voting and a member of the Board of Advisers of the U.S. Election Assistance Commission. She is a former computer researcher for IBM and past-president of the Association for Computing Machinery.