Sync keyshares from multiple TSS servers

entropyxyz / entropy-core

Protocol and cryptography development.

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Sync keyshares from multiple TSS servers #546

Open HCastano opened 9 months ago

HCastano commented 9 months ago

During sync, a TSS only requests key shares from a single server. We should assume that servers can be Byzantine and provide wrong information.

Some possible ways to improve the situation:

Get key share information from multiple servers
Have some sort of way for the TSS to check the validity of the key shares themselves (maybe by referencing some on-chain proof)
Maybe have Synedrion provide some proofs or checking mechanisms that the TSS can use for verification?

HCastano commented 9 months ago

I talked to @fjarri about this, and he mentioned that we should be able to hash the public parts of the keyshares and put that hash on chain (maybe once a session a validator is picked to do this?).

Then, when a TSS is syncing it can check if the keyshares it has downloaded from its peers match the on-chain hash.