New feature: P2P channel implemented to encrypt Tss message using ECDH

[nann-cheng]

Added p2p channel among MPC nodes, allowing authenticated encryption between arbitrary two MPC nodes

[tuananhk13bk]

Added p2p channel among MPC nodes, allowing authenticated encryption between arbitrary two MPC nodes
hi @nann-cheng the term p2p here makes a bit confused. IMO that term is implied at the network layer where nodes exchanges their messages with each other via truly p2p channels (for example using pkg libp2p). Meanwhile, the current architecture is designed in a way that nodes exchange messages via the centralized queue.
You implementation is to enhance the current authentication method (ed25519 key pair) with ECDH protocol? Correct me if I'm wrong.

[nann-cheng]

Within the TSS MPC execution, there are two types of messages exchanged among MPC nodes: broadcasting message which can be public known by observer, and point-to-point messages that should be kept secret among the two parties. Currently, the scheme implement only the broadcasting message but not yet the point-to-point message type. I added that, yes it works by introducing ECDH protocol to negotiate pair-wise symmetric keys, then these keys are used to perform authenticated encryption.

[anhthii]

hi @nann-cheng there are some conflicts, can you please pull the latest change from master branch please. Thanks

[nann-cheng]

Nailed it, please let me know in case of doubt.