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FHEVM is a framework built by Zama to enable confidential smart contracts on EVM-compatible blockchains using Fully Homomorphic Encryption (FHE). It lets developers write Solidity contracts that handle encrypted inputs, encrypted state, arithmetic and logical operations on encrypted types, while maintaining privacy (data always encrypted), composability (encrypted state works alongside public state), and security (via threshold decryption, KMS, etc). The framework includes on-chain and off-chain components (contracts, coprocessors, gateway, utilities) to orchestrate the whole encrypted data pipeline.
Features
- Solidity integration: write smart contracts with encrypted data types (e.g. euint, ebool, eaddress) using standard toolchains like Hardhat or Foundry
- Programmable privacy: developer controls what parts of state/transactions are encrypted, who can decrypt via access control lists etc
- Full range of operations on encrypted data: arithmetic, comparisons, boolean, bitwise, branching (including encrypted conditionals)
- High precision integers (up to 256 bits) when using encrypted integer types
- Security via threshold decryption / key management (KMS), ensuring no single actor can compromise encrypted state
- Use of symbolic execution for on-chain FHE operations (i.e. handles/pointers emitted, off-chain coprocessor does heavy work), enabling efficiency and scalability
Project Samples
Categories
EncryptionLicense
MIT LicenseFollow FHEVM
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