# argon2id

The `argon2id` algorithm uses the memory-hard [Argon2](https://en.wikipedia.org/wiki/Argon2) key derivation function.
It uses a large, fixed memory region to make brute-force computation expensive.
The implementation uses the Rust [`argon2`](https://docs.rs/argon2/latest/argon2/) crate.

```yaml
thresholds:
  - name: moderate-suspicion
    expression:
      all:
        - weight >= 10
        - weight < 20
    action: CHALLENGE
    challenge:
      algorithm: argon2id
      difficulty: 6
```

See [thresholds](/docs/configuration/thresholds.md) for rules based on request weight.