Shush Protocol, developed by Excubia Labs, is a privacy-centric infrastructure layer for autonomous trading agents on Solana and EVM-compatible chains. The protocol enables users to create, deploy, and manage encrypted trading agents that execute strategies without exposing sensitive parameters or portfolio data. At its core, Shush leverages fully homomorphic encryption (FHE) and client-side NaCl cryptography to ensure that strategy logic, trade signals, and agent configurations remain encrypted throughout their lifecycle. Agents operate through an ephemeral wallet architecture with optional privacy routing via the Umbra privacy bridge, allowing for shielded swaps and obfuscated on-chain activity. The platform supports multiple execution modes including client-side, server-evaluated, and ephemeral wallet flows and provides a marketplace where users can list or subscribe to agent strategies.