Dhanushka Rumesh | M☉NAD (dhanushka)

FHE is the library behind Zama , and it’s quietly redefining what it means to do encrypted computation on-chain. In the world of encryption, meaning matters. You don’t throw around words like privacy or confidentiality without knowing exactly what they imply.

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Confidentiality is not the same as privacy. What we’re after here is confidentiality: the ability to perform transactions and run computations without exposing the underlying data to anyone, including the chain itself. Zama FHE makes this possible. Why this matters Everything on Ethereum is public by default. That’s fine for transparency. But not everything should be public. Not your transactions, not your strategy, not your vote.

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With FHE, we can now: Submit encrypted transactions Attach encrypted metadata to smart contracts Enable confidential voting, where only the outcome is public This is a shift in how (decentralized) applications can be built. FHE: How It Works At the core of the FHE system are three keys: Public Key Used to encrypt data. This is the key users interact with when submitting information from the frontend. Anyone can use it to encrypt inputs before sending them on-chain. Evaluation Key This is the key that allows computation directly on encrypted data. No decryption is needed during computation. Private Key This key is the only thing that can decrypt the result of the computation. Whoever holds the private key can choose whether or not to reveal the output.

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Here’s what that looks like: Let’s say you encrypt the numbers 3 and 2. Using the public key, you generate two encrypted blobs. The evaluation key lets the network compute on those blobs directly; in this case, adding them to produce an encrypted version of 5. The private key can then decrypt that final result. At no point were 3 or 2 ever revealed. Only the final 5 , if you choose to reveal it. Explore Zama FHE docs: https://docs.zama.ai

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