Build Your First FHE Smart Contract with Fhenix: A Hands-On Beginner's Guide

Gm Devs 🤗 Welcome to this beginner-friendly tutorial on smart contract using FHE (Fully Homomorphic Encryption). This guide will help you understand how encrypted variables and operations work in Solidity. What is FHE (Fully Homomorphic Encryption)? Fully Homomorphic Encryption (FHE) is a cryptographic breakthrough that allows computations to be performed on encrypted data without decrypting it first. In traditional smart contracts, all data is public. Even private variables are visible on the blockchain. With FHE, the data remains encrypted at all times during computation, enabling privacy-preserving applications simultaneously with smart contract transparency. For a beginner: Imagine a locked opaque box with arm holes. You can stick your hands in the holes and manipulate objects inside the box, but you can't tell what the objects look like, and nobody else can see them either. The contents remain secure, yet you can still work with them. In this contract, we use FHE to keep our coun