How not to let one person go at the same time with different accounts?

Need to create a system for secure voting. All participants of the vote is known in advance, it is possible to install the application on the user's phone. By what methods it is possible to strictly fix one account for one user? (assuming all participants vote nedobrosovisnimi, they can exchange passwords or even hardware) [the main task - not to allow one person to vote instead of another]
July 12th 19 at 17:17
2 answers
July 12th 19 at 17:19
In this formulation all. The malware will just take from a friend a mobile phone and will do the job.
You can restrict the vote in time - tod_Lango commented on July 12th 19 at 17:22
If the participants know each other - they can exchange their mobile phones in advance. - manuela_Mohr commented on July 12th 19 at 17:25
: you can try to force the user to perform some actions that are not possible to do it simultaneously on two devices - tod_Lango commented on July 12th 19 at 17:28
They can just zaranee to agree on who how to vote. This is not a technical problem. - manuela_Mohr commented on July 12th 19 at 17:31
: Yes, and this problem is not within our competence. Our task is to make over 50 people are unable to vote just 5 (to ensure physical participation of a person in the voting) - tod_Lango commented on July 12th 19 at 17:34
: No - collect all the phones, pick up any person off the street, explain what to click and bye. - manuela_Mohr commented on July 12th 19 at 17:37
is to force the voting to turn on the webcam and verbalize aloud, for whom people voted - here you have guaranteed physical human involvement in the vote. But podgovorennye or pre-recorded - is another question, but it is not in your competence - Dashawn commented on July 12th 19 at 17:40
: Only then will need a staff of experts that determined that the video is not fake - manuela_Mohr commented on July 12th 19 at 17:43
the previous comment is more in jest wrote (the task really from the category of impossible, unless, as to the polls, come with a passport not to get), but if you think about it: since it is so important physical presence, then why not make these records, and the vote counted after verification specialist. Or even make a Skype-vote to a live operator user checked. More options for physical test not see - Dashawn commented on July 12th 19 at 17:46
July 12th 19 at 17:21
As the authorization key to use a credit card number and CVV user-specific, so they are not groping each other. With this formulation of the question, nothing more.
Well, a soldier with a rifle.

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