Fully Homomorphic Encryption

Fully homomorphic encryption (FHE) is a cryptographic technique that enables computations to be performed directly on encrypted data without requiring decryption, returning encrypted results that match what would be obtained from performing the same operations on plaintext. This breakthrough technology allows third parties and untrusted servers to process sensitive information while maintaining complete privacy, as they never gain access to unencrypted data. FHE supports arbitrary complex computations including addition, multiplication, and more sophisticated operations, distinguishing it from partial homomorphic schemes that only allow specific operation types. Example: Zama is a blockchain-focused company developing FHE solutions for Web3, enabling private smart contracts and confidential transactions where computations occur on encrypted data while maintaining full functionality and auditability. Why it matters for privacy technology: FHE provides the cryptographic foundation for building truly private blockchain applications, enabling confidential smart contracts and private DeFi protocols where sensitive financial data remains encrypted throughout computation, addressing a critical gap in current blockchain privacy infrastructure.

Category: privacy technology

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