User Decryption - Permission Patterns

Demonstrates user decryption with CORRECT and WRONG permission patterns - critical for all FHEVM development.

What You'll Learn

• THE CRITICAL RULE: FHE.allowThis() MUST come before FHE.allow()
• Why missing FHE.allowThis() breaks user decryption
• Common permission errors and how to debug them
• How to grant permissions to third parties

Correct Pattern ✅

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Wrong Pattern ❌ (Educational)

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Client-Side Decryption

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Common Error Messages

When permissions are wrong, you'll see:

• "reencryption error"
• "permission denied"
• "ACL check failed"

Solution: Always call FHE.allowThis() before FHE.allow()

Why This Template Matters

This is the #1 mistake in FHEVM development. This template shows both patterns so you can:

1. Learn the correct way
2. Understand what breaks
3. Debug permission issues in your own code

Quick Start

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