What are some suggestions for stopping individuals from casting two votes on an Android voting application?

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Implement strong authentication: Require users to sign up with their unique credentials such as email address or phone number. Use two-factor authentication to ensure the identity of the voter.

Use unique identifiers: Assign a unique and random identifier to each user or device that votes. This can help prevent someone from casting multiple votes using the same device or account.

Limit voting: Limit the number of votes that can be cast by each user or device. This can prevent someone from casting multiple votes for the same candidate.

Implement tracking: Track the IP address or location of each vote. This can help to identify fraudulent votes or multiple votes from the same location.

Audit logs: Keep logs of all activity within the voting application, including who voted, when they voted, and what they voted for. This can help to identify any suspicious activity.

Monitor real-time: Monitor voting in real-time to detect and prevent fraudulent activity as it occurs.

Use encryption: Use encryption to protect data stored on the voting application and during transmission to prevent tampering or interception of data.

Employ human supervision: Have human supervisors monitor and verify votes to ensure no one casts multiple votes.