Private Smart Contracts Using Homomorphic Encryption

Zama has released the alpha code and white paper for the fhEVM, showcasing the potential of Fully Homomorphic Encryption (FHE) in enabling private smart contracts on public blockchains. FHE allows encrypted data to be processed without decryption, providing privacy by keeping transaction data and contract states encrypted. Recent advancements have made FHE practical, paving the way for applications such as trustless bridges, blind auctions, and confidential voting. Despite challenges like noise growth and access control, techniques like bootstrapping and schemes like TFHE are addressing these issues, offering improved privacy and computational capabilities. With ongoing developments, including FHE-rollups and hardware accelerators expected by 2025, FHE smart contracts are set to achieve significantly higher throughput, making private blockchain interactions feasible.