Distributed Ballot Based Protocol: Difference between revisions
No edit summary |
No edit summary |
||
Line 6: | Line 6: | ||
==Outline== | ==Outline== | ||
In the beginning, the election authority prepares an N-qudit ballot state where the kth qudit of the state corresponds to <math> | In the beginning, the election authority prepares an N-qudit ballot state where the kth qudit of the state corresponds to <math> V_k</math>’s blank ballot and sends the corresponding blank ballot to <math>V_k</math> together with two option qudits, one for the “yes” and one for the “no” vote. then each voter decides on “yes” or “no” by appending the corresponding option qudit to the blank ballot and performing a 2-qudit measurement, then based on its result she performs a unitary correction and sends the 2-qudits ballot along with the measurement result back to the election authority. At the end of the election, the election authority applies a unitary operation on one of the qudits in the global state and another unitary operation on one of the qudits to find the number of yes votes. | ||
==Notations== | ==Notations== |
Revision as of 06:41, 10 February 2021
This example protocol implements the task of Quantum E-voting. In this protocol, the election authority prepares and distributes to each voter a blank ballot, and gathers it back after all voters have cast their vote in order to compute the final outcome.
Assumptions
- The tallier is assumed to be trusted to correctly prepare specific states.
Outline
In the beginning, the election authority prepares an N-qudit ballot state where the kth qudit of the state corresponds to ’s blank ballot and sends the corresponding blank ballot to together with two option qudits, one for the “yes” and one for the “no” vote. then each voter decides on “yes” or “no” by appending the corresponding option qudit to the blank ballot and performing a 2-qudit measurement, then based on its result she performs a unitary correction and sends the 2-qudits ballot along with the measurement result back to the election authority. At the end of the election, the election authority applies a unitary operation on one of the qudits in the global state and another unitary operation on one of the qudits to find the number of yes votes.
Notations
- Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle V_{i}: i^{th}} voter
- c: number of possible candidates
- N: number of voters
- : vote of voter
- T: election authority
- m: number of yes votes
Requirements
- Quantum channel capable of sending qubits -> (qudit) between the election authority and voters
- Qudit Measurement Device for election authority and voters
Properties
This protocol is vulnerable to double voting. Specifically, an adversary can mount a “d-transfer attack”, and transfer d votes for one option of the referendum election to the other.