Cipher
Cipher is a privacy middleware toolkit for building confidential decentralized applications on EVM chains. It packages advanced cryptography — Zero-Knowledge proofs (Noir) and Fully Homomorphic Encryption (Zama) — into reusable Solidity contracts you inherit and deploy, so you can add private data, proof-based validation, and encrypted computation to your app without designing privacy infrastructure from scratch.
npm i @privacy-protocol/cipher-contractsWhat Cipher does
- Keep data private — protect sensitive inputs, transaction details, and app state on-chain.
- Verify without revealing — prove eligibility, validity, and rules without exposing the underlying data.
- Built for real use cases — apply the right privacy model per domain instead of one generic layer.
- Contracts first — integrate through reusable contracts today, with SDK support as the product expands.
How it works
- Choose an adapter — start from a privacy flow built for your use case.
- Protect the data — Cipher applies proofs and encryption before execution.
- Verify on-chain — contracts validate the action without exposing sensitive data.
- Run securely — your app executes with privacy and verification built in.
Adapters
Cipher is organized into adapters — domain-specific toolkits of reusable contracts you inherit and deploy. Each adapter packages the right privacy architecture for a particular application area.
| Adapter | Status | Purpose |
|---|---|---|
| Private DAO Adapter | Available | Confidential governance — encrypted ballots, encrypted tallying, optional anonymous membership |
See Adapters for details.
Built on proven cryptography
| Foundation | Technology | Role |
|---|---|---|
| Zero-Knowledge proofs | Noir + UltraHonk | Validation, eligibility, and rule enforcement without revealing data |
| Fully Homomorphic Encryption | Zama fhEVM | Encrypted computation — operate on ciphertext without decrypting it |
Why teams choose Cipher
- No chain migration — bring confidentiality to existing EVM apps without moving contracts or assets.
- Less crypto complexity — no hand-rolled circuits or encrypted flows.
- Flexible by domain — adapters designed for real app categories.
- Easy to integrate — reusable contracts with a simple developer workflow.
Supported networks
- Sepolia testnet — available now
- Ethereum mainnet — coming soon
- L2 networks — planned
Next steps
- Prerequisites — tools and concepts you’ll need
- Installation — add Cipher to your project
- Adapters — explore the available adapters
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