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End-to-end auditable or end-to-end voter verifiable E2E systems are voting systems with stringent integrity properties and strong tamper resistance. E2E systems often employ cryptographic methods to craft receipts that allow voters to verify that their votes were counted as cast, without revealing which candidates were voted for.
As such, these systems are sometimes referred to as receipt-based systems. Electronic voting systems arrive at their final vote totals by a series of steps:. Classical approaches to election integrity tended to focus on mechanisms that operated at each step on the chain from voter intent to final total. Voting is an example of a distributed system, and in general, distributed system designers have long known that such local focus may miss some vulnerabilities while over-protecting others.
The failure of current optical scan voting systems to meet reasonable end-to-end standards was pointed out in Comprehensive coverage of election integrity frequently involves multiple stages. Voters are expected to verify that they have marked their ballots as intended, we use recounts or audits to protect the step from marked ballots to ballot-box totals, and we use publication of all subtotals to allow public verification that the overall totals correctly sum the local totals.
While measures such as voter verified paper audit trails and manual recounts increase the effectiveness of our defenses, they offer only weak protection of the integrity of the physical or electronic ballot boxes. Ballots could be removed, replaced, or could have marks added to them i. This shortcoming motivated the development of the end-to-end auditable voting systems discussed here, sometimes referred to as E2E voting systems.
These attempt to cover the entire path from voter attempt to election totals with just two measures:. Because of the importance of the right to a secret ballot , all of the interesting E2E voting schemes also attempt to meet a third requirement, usually referred to as receipt freeness:.
A researcher has argued that end-to-end auditability and receipt-freeness should be considered to be orthogonal properties. To address ballot stuffing , the following measure can be adopted:. Alternatively, assertions regarding ballot stuffing can be externally verified by comparing the number of votes cast with the number of registered voters who voted, and by auditing other aspects of the registration and ballot delivery system.
Support for E2E auditability, based on prior experience using it with in-person elections, is also seen as a requirement for remote voting over the Internet by many experts.
In , David Chaum proposed a solution that allows a voter to verify that the vote is cast appropriately and that the vote is accurately counted using visual cryptography. When the layers are stacked, they show the human-readable vote. However, each transparency is encrypted with a form of visual cryptography so that it alone does not reveal any information unless it is decrypted.
The voter selects one layer to destroy at the poll. The DRE retains an electronic copy of the other layer and gives the physical copy as a receipt to allow the voter to confirm that the electronic ballot was not later changed. The system guards against changes to the voter's ballot and uses a mix-net decryption  procedure to ensure that each vote is accurately counted.
Sastry, Karloff and Wagner pointed out that there are issues with both of the Chaum and VoteHere cryptographic solutions. Chaum's team subsequently developed Punchscan , which has stronger security properties and uses simpler paper ballots. As in Punchscan, the votes are made on paper ballots and a portion of the ballot is scanned. The Scratch and Vote system, invented by Ben Adida , uses a scratch-off surface to hide cryptographic information that can be used to verify the correct printing of the ballot.
The ThreeBallot voting protocol, invented by Ron Rivest , was designed to provide some of the benefits of a cryptographic voting system without using cryptography.
It can in principle be implemented on paper although the presented version requires an electronic verifier. The Scantegrity and Scantegrity II systems provide E2E properties, however instead of being a replacement of the entire voting system, as is the case in all the preceding examples, it works as an add-on for existing optical scan voting systems.
Scantegrity II employs invisible ink and was developed by a team that included Chaum, Rivest, and Ryan. The STAR-vote system under development for Travis County, Texas is another way to combine an E2E system with conventionally auditable paper ballots, produced in this case by a ballot marking device. From Wikipedia, the free encyclopedia. E-Voting and Identity Building Reliable Voting Machine Software.
Acceptance testing Qualification testing Software verification Usability testing.