Fully Homomorphic Encryption
A cryptographic method that lets data be processed while still encrypted, so only the key holder can reveal the final result.
Fully homomorphic encryption is a type of encryption that allows computations to be performed directly on encrypted data. The party doing the computation never sees the underlying information, but when the result is decrypted by the key holder, it matches the result that would have been produced from the unencrypted data. “Fully” means it can support general computation, not just a limited operation such as adding numbers.
In crypto and privacy systems, FHE matters because it can reduce the need to expose sensitive data to apps, blockchains, validators, or service providers. It may be used for private smart contract logic, confidential identity checks, encrypted voting, or analytics on user data without revealing individual inputs. For example, a protocol could calculate whether a wallet meets a rule, such as holding enough tokens, without publicly revealing the exact balance. Compared with zero-knowledge proofs, which prove a statement is true, FHE is more focused on computing with data while it remains encrypted.
Other terms in Cryptography & Privacy
CoinJoin
A privacy technique that combines multiple users’ cryptocurrency payments into one transaction to make input-output links harder to trace.
Crypto Mixer
A service or protocol that blends cryptocurrency from many users to make transaction trails harder to trace on a public blockchain.
Digital Signature
A digital signature is cryptographic proof that a message or transaction was approved by the holder of a specific private key.
Hash Function
A hash function turns any input into a fixed-length string of data that is easy to verify but extremely hard to reverse or predict.