{
  "source_path": "/home/archipelago/Projects/archy/docs/adr/005-chacha20-backup-encryption.md",
  "type": "ADR",
  "confidence": "high",
  "manifest_override": false,
  "title": "ADR-005: ChaCha20-Poly1305 for Backup Encryption",
  "summary": "Chose ChaCha20-Poly1305 AEAD with Argon2id key derivation for encrypting backups at rest, over AES-256-GCM and XChaCha20-Poly1305.",
  "scope": ["backup encryption", "ChaCha20-Poly1305", "Argon2id key derivation", "AEAD", "nonce handling"],
  "cross_refs": [],
  "locked": true,
  "precedence": null,
  "notes": ""
}