MPC ECDH support

[zensh]

1. Encrypting and decrypting data within the canister seems unlikely to work, so I plan to use TEE to implement the AI scenario you described.
2. ICPanda Message uses ECDH to exchange channel keys, but all of this happens on the client side.

Introducing a Decentralized End-to-End Encrypted Messaging App

ICPanda Message is a decentralized end-to-end encrypted messaging application fully running on the Internet Computer blockchain. [image] [image] Key features End-to-end encryption: All user messages are encrypted using the RFC 9052 (COSE) standard on the client side and stored on the ICP blockchain. These messages can only be decrypted on the client side. Multi-user chats: Message channels support one-to-many chats, where a manager can add or remove members and exchange encryption keys. I…