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  • Introduction
  • Motivation
  • Roadmap
  • FAQ
  • Technical Walkthrough
  • Using Redact
    • Confidential Balances (Wallet)
    • Encrypting
    • Decrypting
    • Confidential Transfer (Sending)
  • Architecture
    • FHERC20 Token Standard
    • FHERC20.sol
    • ConfidentialERC20.sol
      • RedactCore.sol
    • CoFHE Overview
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  • Overview
  • Key Capabilities
  • How CoFHE Works
  • CoFHE Architecture
  • Security & Privacy Measures
  1. Architecture

CoFHE Overview

PreviousRedactCore.sol

Last updated 1 month ago

Overview

The Fhenix's Fully Homomorphic Encryption (FHE) CoProcessor - CoFHE - is a key component of the Redact application, enabling confidential computations on EVM-compatible blockchains. It allows dApps to integrate encrypted data into their smart contracts, ensuring private transactions, confidential token minting, and secure data queries while preserving the benefits of blockchain transparency.

By leveraging FHE, CoFHE enables computations on encrypted data without decryption, ensuring data confidentiality throughout the entire transaction lifecycle.

to CoFHE Documents

Key Capabilities

CoFHE enhances Redact by enabling:

  • Confidential Token Wrapping: Converts ERC-20 tokens into fhERC20 without revealing transaction details.

  • Confidential Transactions: Redact users can send and receive assets without exposing balances or transaction amounts.

  • Permit-Based Decryption: Users can selectively share encrypted data without compromising security.

How CoFHE Works

CoFHE operates as an off-chain computation layer that processes encrypted operations asynchronously and returns verified encrypted results back to the blockchain. This ensures scalability, security, and privacy without compromising blockchain integrity.

Transaction Flow

  1. A user initiates an FHE operation (e.g., sending confidential token or querying confidenital balances).

  2. The Task Manager Contract (on-chain) processes the request and generates an encrypted handle.

  3. The Aggregator (off-chain) receives the request and forwards it to the fheOS Server for computation.

  4. The fheOS Server executes the FHE operation, ensuring the data remains encrypted.

  5. Results are verified and sent back on-chain, maintaining confidentiality throughout the process.

CoFHE Architecture

CoFHE consists of several components that work together to secure and process encrypted transactions:

  1. FHE.sol Library

    1. A Solidity library that allows smart contracts to execute confidential operations.

    2. Imported directly into dApps to enable confidential token wrapping, minting, and transactions.

  2. Task Manager Contract

    1. Acts as the entry point for dApps integrating with CoFHE.

    2. Handles requests for FHE computations and confidential transactions.

  3. Aggregator

    1. Collects and processes FHE operation requests in a secure and structured manner.

    2. Sends requests to fheOS Server for execution.

  4. fheOS Server

    1. The computation engine responsible for executing encrypted transactions.

    2. Ensures data remains encrypted throughout the entire process.

  5. Threshold Network (Decentralized Decryption)

    1. Uses multi-party computation (MPC) to handle decryption requests securely.

    2. Ensures no single entity can access decrypted data, maintaining trustless confidentiality.

Security & Privacy Measures

CoFHE implements multiple security mechanisms to ensure data privacy and integrity:

  • Fully Homomorphic Encryption (FHE): Keeps data encrypted during computation.

  • Threshold Network Encryption: Prevents unauthorized decryption.

  • Zero-Knowledge Proofs (ZKPoK): Ensures computations are valid without revealing data.

  • Access Control Mechanism (ACL.sol): Restricts who can decrypt and interact with encrypted data.

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