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elichai
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tudorcebere
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Nov 22, 2021
| ## How To Use | ||
| ### Refresh a Key | ||
| Each party calls `RefreshMessage::distribute(key)` on their `LocalKey` and broadcasts the `RefreshMessage` while saving their new `DecryptionKey`. <br> | ||
| After recieving all the refresh messages each party calls `RefreshMessage::collect(..)` with a vector of all the refresh messages, a mutable reference to their own key, and their new `DecryptionKey`, This will validate all the refresh messages, and if all the proofs are correct it will update the local key to contain the new decryption keys of all the parties. |
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recieving -> receiving
| Note that this part is delicate and needs to happen outside of the library because it requires some kind of mutual agreement, and you cannot trust the new party to communicate which party are they replacing. <br> | ||
| After agreeing on the index each party modifies the join message to contain the index `join_message.party_index = Some(index)`. <br> | ||
| Each existing party calls `RefreshMessage::replace(join_message, local_key)` with the join message and its own local key, this returns a refresh message and a new decryption key, just like in a Key Refresh, and they all broadcast the `RefreshMessage`. <br> | ||
| Each existing party recieves all the broadcasted refresh messages and calls `RefreshMessage::collect(..)` with a vector of all the refresh messages, a mutable reference to their own key, the new `DecryptionKey`, and a slice of all the join messages(`JoinMessage`) <br> |
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recieves -> receives
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This adds an assertion of the assumption that
t <= n/2toRefreshMessage::distribute.And adds documentation on how to replace refresh the keys or replace a party