Gateway Decryption - Public Revelation

Two-phase gateway decryption pattern for revealing encrypted values publicly - essential for auctions, voting results, and game outcomes.

What You'll Learn

• Two-phase decryption flow (request → callback)
• Using FHE.makePubliclyDecryptable()
• Gateway callback pattern
• Event-driven architecture for decryption
• Production security considerations

Two-Phase Pattern

Phase 1: Request Decryption

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Phase 2: Gateway Callback

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Use Cases

• Auctions: Reveal winning bid after bidding ends
• Voting: Publish results after voting period
• Gaming: Determine outcomes (dice rolls, card draws)
• Lotteries: Reveal random winner publicly

Complete Flow

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Production Security

⚠️ This simplified example lacks production security!

Real implementations MUST:

• Verify msg.sender is authorized gateway
• Check cryptographic proofs (FHE.checkSignatures)
• Prevent replay attacks
• Handle callback failures

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Quick Start

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Important Notes

• Decryption is async (two separate transactions)
• Gateway must be running and monitoring events
• This is one-way (encrypted → public, cannot go back)
• Use for revealing information, not for computation