Protocol V2

[igor-sirotin]

We wanted to write a working app first. Gather all weak points, list State properties, and then come up with protocol V2.
The ideas below were in our minds when implementing V1, but we intentionally postponed them.

There're 2 main problems with protocol V1.

1. Disable dealer to rig the vote

Problem

In current protocol there's no way (except visual check) to check the validity of other player's vote.
The dealer is able to write any votes by any players and distribute it to other players.

Proposed solution

1. Each player generate a pair of public/private keys.
2. Player's public key becomes their ID
3. Each vote is signed with player's private key
4. Other players are able to check the vote signature knowing other player's public key.

2. Reduce network load and decrease "dealer-centralization"

Problem

We're harassing waku network by 2 simplifications:

1. All messages are only processed by dealer, who then distributes a new game State message to everyone.
2. We use json instead of protobuf

Proposed solution 1

1. Player A encrypt their vote with dealer's public key.
2. Other players "hear" in the network that Player A voted, but they can't decrypt the value.
3. Dealer receives the vote and decrypt it.
4. To reveal votes, dealer distribute decrypted votes to all players

Proposed solution 2

1. Dealer generate a keypair for each issue
2. Dealer shares the public key of each issue
3. Players encrypt their votes with the issue public key
4. Other players "hear" votes in the network, but they can't decrypt values
5. To reveal votes, dealer shares issue's private key, so players are finally able to decrypt votes values.

[igor-sirotin]

Discussion moved to #85