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Is it possible for devices on an online group chat to toss a coin without trusting each other and the server? (discuss.tchncs.de)

submitted 5 months ago by [email protected] to c/[email protected]

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[–] [email protected] 4 points 5 months ago* (last edited 5 months ago) (1 children)

All participants select their own random whole number and publish it to the group. All participants add all the numbers together. The result is either odd or even (heads/tails) and everyone arrives at the same result independently.

[–] [email protected] 8 points 5 months ago (1 children)

The last person to send the number decide the outcome

[–] [email protected] 1 points 5 months ago (1 children)

It doesn't have to be addition. It could be a hash function, etc.

[–] fishpen0 5 points 5 months ago

If the function is known by all parties then the last person to send still has control