zama-ai/fhevm

Analysis updated 2026-06-21

★ 25,316RustAudience · developerComplexity · 5/5Setup · hard

Mindmap

mindmap
  root((FHEVM))
    What it enables
      Encrypted on-chain state
      Private smart contracts
      Quantum-resistant privacy
    Architecture
      On-chain Solidity contracts
      Rust coprocessor off-chain
      Multi-party key management
    Use cases
      Blind auctions
      Private voting
      Confidential transfers
      Secret game moves
    Tech
      Rust coprocessor
      Solidity contracts
      Docker and Helm deploy
    Audience
      Blockchain developers
      Privacy engineers

mindmap root((FHEVM)) What it enables Encrypted on-chain state Private smart contracts Quantum-resistant privacy Architecture On-chain Solidity contracts Rust coprocessor off-chain Multi-party key management Use cases Blind auctions Private voting Confidential transfers Secret game moves Tech Rust coprocessor Solidity contracts Docker and Helm deploy Audience Blockchain developers Privacy engineers

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What do people build with it?

USE CASE 1

Build a blind auction on-chain where all bids stay encrypted and hidden until the auction closes.

USE CASE 2

Create confidential token transfers where transaction amounts are invisible to everyone on the network.

USE CASE 3

Build a private on-chain voting system where individual votes are encrypted but the final tally is verifiable.

USE CASE 4

Develop an on-chain game where player moves remain secret until both sides have committed.

What is it built with?

RustSolidityDockerHelm

How does it compare?

	zama-ai/fhevm	alexsjones/llmfit	wilfred/difftastic
Stars	25,316	25,392	25,239
Language	Rust	Rust	Rust
Setup difficulty	hard	moderate	easy
Complexity	5/5	2/5	2/5
Audience	developer	developer	developer

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · hard Time to first run · 1day+

Requires Rust, Docker, Helm, and an Ethereum-compatible chain, the cryptographic concepts add significant setup and learning curve.

In plain English

FHEVM is a framework that brings data privacy to blockchain applications by using a technology called Fully Homomorphic Encryption, or FHE. In plain terms, FHE lets a computer perform calculations on encrypted data without ever decrypting it, meaning the raw information is never exposed, not even to the blockchain network processing it. FHEVM applies this to Ethereum-compatible blockchains (blockchains that support smart contracts written in a language called Solidity), so developers can build applications where transaction amounts, user balances, votes, or game moves remain completely hidden from everyone. The framework works in two layers: on-chain smart contracts handle the encrypted state and access control logic, while a separate Rust-based coprocessor handles the heavy cryptographic computations off-chain. A key management system using multi-party computation manages the encryption keys, so no single party can decrypt data on their own. The encryption scheme is also described as quantum-resistant, meaning it is designed to withstand future quantum computers. You would use this if you are building a decentralized application that needs genuine privacy, for example, blind auctions where bids stay hidden, confidential token transfers, private voting systems, or on-chain games that keep player moves secret until revealed. The tech stack includes Rust for the coprocessor and Solidity for the smart contracts, with deployment configurations using Helm and Docker.

Copy-paste prompts

Prompt 1

Show me how to write a Solidity smart contract using FHEVM encrypted integer types to store a hidden user balance.

Prompt 2

How do I set up the FHEVM Rust coprocessor locally with Docker to test encrypted smart contracts on a local chain?

Prompt 3

Give me a complete example of a blind auction smart contract in Solidity using FHEVM where bids stay hidden until reveal.

Prompt 4

How does FHEVM's multi-party key management system ensure no single party can decrypt user data on their own?

Prompt 5

What FHEVM Solidity data types are available for encrypted values, and how do I perform addition on two encrypted integers?

Frequently asked questions

What is fhevm?

FHEVM is a framework that brings data privacy to Ethereum-compatible blockchains using fully homomorphic encryption, so smart contracts can compute on encrypted data without ever exposing it.

What language is fhevm written in?

Mainly Rust. The stack also includes Rust, Solidity, Docker.

How hard is fhevm to set up?

Setup difficulty is rated hard, with roughly 1day+ to a first successful run.

Who is fhevm for?

Mainly developer.

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